Ford Escape Quiz
Electrical

Diagnosis and Testing - Turn Signals and Hazard Warning

In this manual: Electrical
General Information — 26Chassis — 160Powertrain — 323Electrical — 356Body and Paint — 290
~31min read

Diagnostic Trouble Code (DTC) Chart

The diagnosis in this manual assumes a certain level of skill and knowledge of Ford-approved diagnostic procedures.
REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).


Diagnostic Trouble Code Chart


Module Trouble Code Description Action
BCM B123A:11 Left front turn signal: short to ground GO to Pinpoint Test B
BCM B123A: 15 Left front turn signal: short to battery or open circuit GO to Pinpoint Test B
BCM B123B: 11 Right front turn signal: short to ground GO to Pinpoint Test B
BCM B123B: 15 Right front turn signal: short to battery or open circuit GO to Pinpoint Test B
BCM B1247:11 Left rear turn signal: short to ground GO to Pinpoint Test B
BCM B1247:15 Left rear turn signal: short to battery or open circuit GO to Pinpoint Test B
BCM B1248:11 Right rear turn signal: short to ground GO to Pinpoint Test B
BCM B1248:15 Right rear turn signal: short to battery or open circuit GO to Pinpoint Test B
BCM B1497:01 Left front turn signal feedback: general electrical failure GO to Pinpoint Test D
BCM B1498:01 Right front turn signal feedback: general electrical failure GO to Pinpoint Test D
BCM B1D35:11 Hazard switch: short to ground GO to Pinpoint Test C
DDM B1D06:11 Left rear turn signal: short to ground GO to Pinpoint Test B
PDM B1D07:11 Right rear turn signal: short to ground GO to Pinpoint Test B
SCCM B124K:96 Multifunction switch turn signal assembly: internal component fault GO to Pinpoint Test E
SCCM B124K:9E Turn signal switch pack: stuck in on position GO to Pinpoint Test E

Global Customer Symptom Codes (GCSC) Table

The diagnosis in this manual assumes a certain level of skill and knowledge of Ford-approved diagnostic procedures.
REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).


Symptom Action
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Inoperative GO to Pinpoint Test A
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Inoperative GO to Pinpoint Test B
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Inoperative GO to Pinpoint Test C
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Inoperative GO to Pinpoint Test D
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Remains On GO to Pinpoint Test A
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Remains On GO to Pinpoint Test B
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Remains On GO to Pinpoint Test C
Lighting/Glass/Vision > Exterior Lighting > Turn Signal > Remains On GO to Pinpoint Test D

Symptom Charts

Symptom Chart: Turn Signals and Hazard Warning

The diagnosis in this manual assumes a certain level of skill and knowledge of Ford-approved diagnostic procedures.
REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).

Condition Action
Module Does Not Respond to Diagnostic Scan Tool
REFER TO: Communication Network (418-00 Communication Network, Diagnosis and Testing).
Turn signal function inoperative or always on GO to Pinpoint Test A
One turn signal lamp inoperative or constantly on GO to Pinpoint Test B
Hazard lamp function inoperative or constantly on GO to Pinpoint Test C
Turn signal lamps and indicator flash rapidly when no turn signal is selected, do not operate or do not flash rapidly when a turn signal lamp is inoperative GO to Pinpoint Test D

Pinpoint Tests


DIAGNOSTIC TEST A: TURN SIGNAL FUNCTION INOPERATIVE OR ALWAYS ON

For wiring diagrams and connector information, refer to Section 90 Wiring Diagrams.

Normal Operation and Fault Symptoms

REFER TO: Exterior Lighting - Overview (417-01 Exterior Lighting, Description and Operation).
REFER TO: Exterior Lighting - System Operation and Component Description (417-01 Exterior Lighting, Description and Operation).

Possible Sources

  • Multifunction Switch on the LH Steering Column
  • SCCM
  • BCM
A1 CHECK SCCM (STEERING COLUMN CONTROL MODULE) TURN SIGNAL PARAMETER IDENTIFICATIONS (PIDS)
  • The ignition is on.
  • Using the diagnostic scan tool, monitor the SCCM PIDs below while placing the left multifunction switch on the steering column in the left and right turn positions.

    • Access the SCCM and monitor the TRN_SIG_SW_L PID

    • Access the SCCM and monitor the TRN_SIG_SW_R PID


Do the parameter identifications (PIDs) match the left multifunction switch position on the steering column?
Yes GO to A2
No INSTALL a new left multifunction switch on the steering column.
Refer to: Left Multifunction Switch on the Steering Column (211-05 Steering Wheel and Column Electrical Components, Removal and Installation).
CHECK the system for normal operation. If the concern is not resolved, GO to A3.
A2 CHECK THE BCM (BODY CONTROL MODULE) OPERATION
  • Disconnect and inspect all BCM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • backed-out pins - install new pins as necessary
  • Reconnect the BCM connectors. Make sure they are fully seated and locked.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this condition, STOP this test and FOLLOW the service article instructions. If no service article resolves this condition, INSTALL a new BCM.
REFER TO: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
A3 CHECK SCCM (STEERING COLUMN CONTROL MODULE) OPERATION
  • Disconnect and inspect all SCCM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • backed-out pins - install new pins as necessary
  • Reconnect the SCCM connectors. Make sure they are fully seated and locked.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, STOP this test and FOLLOW the TSB instructions. If no TSBs apply to this concern, INSTALL a new SCCM.
Refer to: Steering Column Control Module (SCCM) (211-05 Steering Wheel and Column Electrical Components, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
DIAGNOSTIC TEST B: ONE TURN SIGNAL LAMP INOPERATIVE OR ALWAYS ON

For wiring diagrams and connector information, refer to Section 90 Wiring Diagrams.

Normal Operation and Fault Symptoms

REFER TO: Exterior Lighting - Overview (417-01 Exterior Lighting, Description and Operation).
REFER TO: Exterior Lighting - System Operation and Component Description (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
BCM B123A: 11 Left front turn signal: short to ground Continuous memory and on-demand DTC that is set when the BCM detects a short to ground in the left front turn signal lamp power circuit.
BCM B123A: 15 Left front turn signal: short to battery or open circuit Continuous memory and on-demand DTC that is set when the BCM detects an open or short to voltage in the left front turn signal lamp power circuit.
BCM B123B: 11 Right front turn signal: short to ground Continuous memory and on-demand DTC that is set when the BCM detects a short to ground in the right front turn signal lamp power circuit.
BCM B123B: 15 Right front turn signal: short to battery or open circuit Continuous memory and on-demand DTC that is set when the BCM detects an open or short to voltage in the right front turn signal lamp power circuit.
BCM B1247:11 Left rear turn signal: short to ground Continuous memory and on-demand DTC that is set when the BCM detects a short to ground in the left rear turn signal lamp power circuit.
BCM B1247:15 Left rear turn signal: short to battery or open circuit Continuous memory and on-demand DTC that is set when the BCM detects an open or short to voltage in the left rear turn signal lamp power circuit.
BCM B1248:11 Right rear turn signal: short to ground Continuous memory and on-demand DTC that is set when the BCM detects a short to ground in the right rear turn signal lamp power circuit.
BCM B1248:15 Right rear turn signal: short to battery or open circuit Continuous memory and on-demand DTC that is set when the BCM detects an open or short to voltage in the right rear turn signal lamp power circuit.
DDM B1D06:11 Left turn indicator: short to ground Continuous memory DTC that is set when the DDM detects an open or short to voltage in the outside mirror turn signal lamp power circuit.
PDM B1D07:11 Right turn indicator: short to ground Continuous memory and on-demand DTC that is set when the PDM detects an open or short to voltage in the outside mirror turn signal lamp power circuit.

Possible Sources

  • Lamp
  • Headlamp Assembly
  • Rear Lamp Assembly
  • Outside Mirror
  • Wiring, Terminals or Connectors
  • DDM
  • PDM
  • BCM
B1 DETERMINE IF ANY TURN SIGNAL LAMP IS ALWAYS ON
  • The ignition is on.
  • Activate the hazard warning function.
  • Observe the front and rear turn signal lamps.

Is any turn signal lamp constantly on (not flashing)?
Yes For a front or mirror turn signal lamp, GO to B2.
For rear turn signal lamps, GO to B3
No For a front turn signal lamp, GO to B4.
For rear turn signal lamps, GO to B10
For a mirror turn signal lamp, GO to B15.
B2 CHECK FRONT OR MIRROR TURN SIGNAL POWER CIRCUIT FOR VOLTAGE
  • Ignition OFF.
  • Deactivate the hazard warning function.
  • Disconnect C2280E (front lamps).
  • Disconnect DDM C501B (left outside mirror lamp).
  • Disconnect PDM C652B (right outside mirror lamp).
  • The ignition is on.

Does the corresponding turn signal lamp remain on?
Yes REPAIR the faulty circuit.
No For the left outside mirror turn signal, GO to B20.
For the right outside mirror turn signal, GO to B21.
For all other turn signals, GO to B19.
B3 CHECK REAR TURN SIGNAL VOLTAGE POWER CIRCUIT FOR VOLTAGE
  • Ignition OFF.
  • Deactivate the hazard warning function.
  • Disconnect the C2280F connector.
  • The ignition is on.

Does the corresponding turn signal lamp remain on?
Yes REPAIR the faulty circuit.
No GO TO B19
B4 CHECK THE VOLTAGE AT THE FRONT TURN LAMP
  • Ignition OFF.
  • Deactivate the hazard warning function.
  • Disconnect the inoperative left headlamp C1021 or right headlamp C1041 for halogen headlamps.
  • Disconnect the inoperative left headlamp C1284 or right headlamp C1285 for LED headlamps.
  • The ignition is on.
  • Activate the hazard warning lamp function.
  • For halogen headlamps, measure:
    Click to display connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1021-2 Ground

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1041-2 Ground
  • For LED headlamps, measure:
    Click to display connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1284-2 Ground

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1285-2 Ground

Does the voltage change from 0 to more than 11 volts?
Yes GO to B6
No GO to B5
B5 REPEAT THE SELF-TEST AS REQUIRED AND CHECK THE VOLTAGE AT THE FRONT TURN LAMP
  • Deactivate the hazard warning function.
  • Using a scan tool, perform the BCM self-test.
  • Clear the diagnostic trouble codes (DTCs) and repeat the self-test (required to enable the lamp output driver).
  • Turn the headlamp switch to the OFF position.
  • Ignition OFF.
  • The ignition is on.
  • Activate the hazard warning lamp function.
  • For halogen headlamps, measure:
    Click to display connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1021-2 Ground

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1041-2 Ground
  • For LED headlamps, measure:
    Click to display connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1284-2 Ground

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1285-2 Ground

Does the voltage change from 0 to more than 11 volts?
Yes For higher-series headlamps, GO to B7
No GO to B8
B6 CHECK THE TURN LAMP GROUND CIRCUIT FOR AN OPEN
  • For halogen headlamps, measure:
    Click to display connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1021-2 C1021-7
    C1021-2 C1021-8
    C1021-2 C1021-9

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1041-2 C1041-7
    C1041-2 C1041-8
    C1041-2 C1041-9
  • For LED headlamps, measure:
    Click to display connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1284-2 C1284-8

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1285-2 C1285-8

Does the voltage change from 0 to more than 11 volts?
Yes For higher-series headlamps, GO to B7
No REPAIR the faulty circuit.
B7 CHECK THE LED (LIGHT EMITTING DIODE) CONTROL MODULE
  • Deactivate the hazard warning function.
  • Ignition OFF.
  • Connect the non-operating left headlamp C1284 or right headlamp C1285.
  • Replace the known good LED control module from the opposite headlamp.
  • The ignition is on.
  • CLEAR the diagnostic trouble codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and ON. REPEAT the self-test.
  • Activate the hazard warning lamp function.
  • Operate the system and determine if the concern is still present.

Does the condition persist or are any diagnostic trouble codes (DTCs) returned?
Yes REMOVE the known good LED control module. INSTALL a new headlamp assembly.
REFER TO: Headlamp Assembly (417-01 Exterior Lighting, Removal and Installation).
No REMOVE the known good LED control module. INSTALL a new LED control module.
B8 CHECK THE FRONT TURN LAMP POWER CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Turn off the hazard warning function.
  • Disconnect the C2280E connector.
  • For halogen headlamps, measure:
    Click to display connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1021-2 Ground

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1041-2 Ground
  • For LED headlamps, measure:
    Click to display connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1284-2 Ground

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1285-2 Ground

Is the resistance greater than 10000 Ohms?
Yes GO to B9
No REPAIR the circuit. After the repair:
If no diagnostic trouble codes (DTCs) are present, CHECK the system for normal operation.
If any BCM diagnostic trouble codes (DTCs) other than DTC U3000:49 are present, CLEAR the diagnostic trouble codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and turn the ignition off and back on. CHECK the system for normal operation.
If DTC U3000:49 is present, INSTALL a new BCM.
REFER TO: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
B9 CHECK THE FRONT TURN LAMP POWER CIRCUIT FOR AN OPEN
  • For halogen headlamps, measure:
    Click to display connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1021-2 C2280E-3

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1041-2 C2280E-2
  • For LED headlamps, measure:
    Click to display connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1284-2 C2280E-3

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1285-2 C2280E-2

Is the resistance less than 3 ohms?
Yes GO TO B19
No REPAIR the circuit.
B10 CHECK THE REAR TURN LAMP POWER VOLTAGE
  • Ignition OFF.
  • Turn off the hazard warning function.
  • Disconnect the left rear lamp C423 or the right rear lamp C422.
  • The ignition is on.
  • Activate the hazard warning lamp function.
  • Action:
    Click to display the connectors

    Left rear turn lamp


    Positive lead Measurement/Action Negative lead
    C423-1 Ground

    Click to display the connectors

    RH Rear Turn Lamp


    Positive lead Measurement/Action Negative lead
    C422-1 Ground

Does the voltage change from 0 to more than 11 volts?
Yes GO to B12
No GO to B11
B11 REPEAT THE SELF-TEST AS REQUIRED AND CHECK THE VOLTAGE AT THE REAR TURN LAMP
  • Turn off the hazard warning function.
  • Using a scan tool, perform the BCM self-test.
  • Clear the diagnostic trouble codes (DTCs) and repeat the self-test (required to enable the lamp output driver).
  • Ignition OFF.
  • The ignition is on.
  • Activate the hazard warning lamp function.
  • Action:
    Click to display the connectors

    Left rear turn lamp


    Positive lead Measurement/Action Negative lead
    C423-1 Ground

    Click to display the connectors

    RH Rear Turn Lamp


    Positive lead Measurement/Action Negative lead
    C422-1 Ground

Does the voltage change from 0 to more than 11 volts?
Yes INSTALL a new rear turn lamp.
No GO to B13
B12 CHECK THE REAR TURN LAMP GROUND CIRCUIT FOR AN OPEN
  • Action:
    Click to display the connectors

    Left rear turn lamp


    Positive lead Measurement/Action Negative lead
    C423-1 C423-5

    Click to display the connectors

    RH Rear Turn Lamp


    Positive lead Measurement/Action Negative lead
    C422-1 C422-5

Does the voltage change from 0 to more than 11 volts?
Yes INSTALL a new rear turn lamp.
No REPAIR the circuit.
B13 CHECK THE REAR TURN LAMP POWER CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Turn off the hazard warning function.
  • Disconnect the C2280F connector.
  • Action:
    Click to display the connectors

    Left rear turn lamp


    Positive lead Measurement/Action Negative lead
    C423-1 C2280F-6

    Click to display the connectors

    RH Rear Turn Lamp


    Positive lead Measurement/Action Negative lead
    C422-1 C2280F-65

Is the resistance less than 3 ohms?
Yes GO to B14
No REPAIR the circuit.
B14 CHECK THE REAR TURN LAMP POWER CIRCUIT FOR A SHORT TO GROUND
  • Action:
    Click to display the connectors

    Left rear turn lamp


    Positive lead Measurement/Action Negative lead
    C423-1 Ground

    Click to display the connectors

    RH Rear Turn Lamp


    Positive lead Measurement/Action Negative lead
    C422-1 Ground

Is the resistance greater than 10000 Ohms?
Yes GO TO B19
No REPAIR the circuit. After the repair:
If no diagnostic trouble codes (DTCs) are present, CHECK the system for normal operation.
If any BCM diagnostic trouble codes (DTCs) other than DTC U3000:49 are present, CLEAR the diagnostic trouble codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and turn the ignition off and back on. CHECK the system for normal operation.
If DTC U3000:49 is present, INSTALL a new BCM.
REFER TO: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
B15 CHECK THE VOLTAGE AT THE OUTER MIRROR
  • Ignition OFF.
  • Turn off the hazard warning function.
  • Disconnect the left outer mirror C521 or the right outer mirror C601. Does the signal stop?
  • The ignition is on.
  • Activate the hazard warning lamp function.
  • Action:
    Click to display the connectors

    Left outer mirror turn lamp


    Positive lead Measurement/Action Negative lead
    C521-2 Ground

    Click to display the connectors

    Right outer mirror turn lamp


    Positive lead Measurement/Action Negative lead
    C601-2 Ground

Does the voltage change from 0 to more than 11 volts?
Yes GO TO B16
No GO TO B17
B16 CHECK THE MIRROR TURN LAMP GROUND
  • Action:
    Click to display the connectors

    Left outer mirror turn lamp


    Positive lead Measurement/Action Negative lead
    C521-2 C521-16

    Click to display the connectors

    Right outer mirror turn lamp


    Positive lead Measurement/Action Negative lead
    C601-2 C601-16

Does the voltage change from 0 to more than 11 volts?
Yes CHECK the outer mirror jumper harness between the vehicle harness and the parking lamp for an open circuit, damage or pushed-out pins. If the jumper harness is good, INSTALL a new outer mirror turn lamp. If the harness cannot be repaired, INSTALL a new outer mirror turn lamp.
REFER TO: Outer Mirror (501-09 Rear View Mirrors, Removal and Installation).
No REPAIR the circuit.
B17 CHECK THE MIRROR TURN LAMP POWER CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Turn off the hazard warning function.
  • Disconnect DDM C501B (left outside mirror lamp).
  • Disconnect PDM C652B (right outside mirror lamp).
  • Action:
    Click to display the connectors

    Left outer mirror turn lamp


    Positive lead Measurement/Action Negative lead
    C521-2 Ground

    Click to display the connectors

    Right outer mirror turn lamp


    Positive lead Measurement/Action Negative lead
    C601-2 Ground

Is the resistance greater than 10000 Ohms?
Yes GO TO B18
No REPAIR the circuit.
B18 CHECK THE MIRROR TURN LAMP POWER CIRCUIT FOR AN OPEN
  • Action:
    Click to display the connectors

    Left outer mirror turn lamp


    Positive lead Measurement/Action Negative lead
    C521-2 C501B-4

    Click to display the connectors

    Right outer mirror turn lamp


    Positive lead Measurement/Action Negative lead
    C601-2 C652B-4

Is the resistance less than 3 ohms?
Yes For the left outer mirror turn signal, GO to B20.
For the right outer mirror turn signal, GO to B21.
No REPAIR the circuit.
B19 CHECK THE BCM (BODY CONTROL MODULE) FOR PROPER OPERATION
  • Disconnect and inspect all BCM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • backed-out pins - install new pins as necessary
  • Reconnect the BCM connectors. Make sure they are fully seated and locked.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable technical service bulletins (TSBs). If a TSB exists for this concern, STOP this test and FOLLOW the TSB instructions. If no TSBs apply to this concern, INSTALL a new BCM.
REFER TO: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
B20 CHECK THE DDM (DRIVER DOOR MODULE) FOR PROPER OPERATION
  • Disconnect and inspect all DDM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • backed-out pins - install new pins as necessary
  • Reconnect the DDM connectors. Make sure they are fully seated and properly latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this condition, STOP this test and FOLLOW the TSB instructions. If no TSB addresses this concern, INSTALL a new DDM.
REFER TO: Driver Door Module (DDM) (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
B21 CHECK THE PDM (PASSENGER DOOR MODULE) FOR PROPER OPERATION
  • Disconnect and inspect all PDM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • backed-out pins - install new pins as necessary
  • Reconnect the PDM connectors. Make sure they are fully seated and properly latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this condition, STOP this test and FOLLOW the TSB instructions. If no TSB addresses this concern, INSTALL a new PDM.
REFER TO: Passenger Door Module (PDM) (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
DIAGNOSTIC TEST C: HAZARD FUNCTION INOPERATIVE OR ALWAYS ON

For wiring diagrams and connector information, refer to Section 90 Wiring Diagrams.

Normal Operation and Fault Symptoms

REFER TO: Exterior Lighting - Overview (417-01 Exterior Lighting, Description and Operation).
REFER TO: Exterior Lighting - System Operation and Component Description (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
BCM B1D35:11 Hazard switch: short to ground Continuous memory and on-demand DTC that is set when the BCM detects a short to ground in the hazard warning input circuit.

Possible Sources

  • Wiring, Terminals or Connectors
  • Hazard warning switch
  • BCM
C1 CHECK THE BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • The ignition is on.
  • Using a scan tool, perform the BCM self-test.

Is DTC B1D35:11 present?
Yes GO to C2
No GO TO C4
C2 DISCONNECT THE HAZARD WARNING SWITCH
  • Ignition OFF.
  • Disconnect the hazard warning switch C2480.
  • The ignition is on.
  • Using a scan tool, clear the diagnostic trouble codes (DTCs) and repeat the BCM self-test.

Is DTC B1D35:11 set again?
Yes GO to C3
No INSTALL a new hazard warning switch.
REFER TO: Hazard Warning Switch (417-01 Exterior Lighting, Removal and Installation).
C3 CHECK THE HAZARD WARNING SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect C2280D.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C2480-4 Ground

Is the resistance greater than 10000 Ohms?
Yes GO to C6
No REPAIR the circuit.
C4 CHECK THE HAZARD WARNING SWITCH VOLTAGE SIGNAL
  • Ignition OFF.
  • Disconnect the hazard warning switch C2480.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C2480-4 Ground

Is the voltage greater than 11 volts?
Yes INSTALL a new hazard warning switch.
REFER TO: Hazard Warning Switch (417-01 Exterior Lighting, Removal and Installation).
No GO to C5
C5 CHECK THE HAZARD WARNING SWITCH INPUT CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect C2280D.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C2480-4 C2280D-12

Is the resistance less than 3 ohms?
Yes GO to C6
No REPAIR the circuit.
C6 CHECK THE BCM (BODY CONTROL MODULE) FOR PROPER OPERATION
  • Disconnect and inspect all BCM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • backed-out pins - install new pins as necessary
  • Reconnect the BCM connectors. Make sure they are fully seated and locked.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this condition, STOP this test and FOLLOW the service article instructions. If no service article resolves this condition, INSTALL a new BCM.
REFER TO: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
DIAGNOSTIC TEST D: TURN SIGNAL INDICATOR FLASHES RAPIDLY WITH NO TURN SIGNAL ACTIVE, LAMPS INOPERATIVE OR NOT FLASHING RAPIDLY WHEN TURN SIGNAL LAMP IS ON

For wiring diagrams and connector information, refer to Section 90 Wiring Diagrams.

Normal Operation and Fault Symptoms

REFER TO: Exterior Lighting - Overview (417-01 Exterior Lighting, Description and Operation).
REFER TO: Exterior Lighting - System Operation and Component Description (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
BCM B1497:01 Left front turn signal feedback: general electrical failure Continuous memory DTC that is set when the BCM detects an electrical fault. Failure of the left front turn signal cancel circuit when the turn signal is active.
BCM B1498:01 Right front turn signal feedback: general electrical failure Continuous memory DTC that is set when the BCM detects an electrical fault. Failure of the right front turn signal cancel circuit when the turn signal is active.

Possible Sources

  • Wiring, Terminals or Connectors
  • BCM
D1 DETERMINE IF THE VEHICLE IS EQUIPPED WITH A TRM (TRAILER MODULE)
  • Using a scan tool, perform the network test.

Does the test indicate a TRM is present and does the network test pass?
Yes GO to D2
No If the TRM is present and fails the network test, DIAGNOSE a loss of communication with the TRM.
REFER TO: Communication Network (418-00 Communication Network, Diagnosis and Testing). If the TRM is not present, GO to D4.
D2 CHECK THE BCM (BODY CONTROL MODULE) AND TRM (TRAILER MODULE) STORED DIAGNOSTIC TROUBLE CODES (DTCS) SELF-TEST
  • Using the diagnostic scan tool, perform a self-test of the BCM and TRM.

Are there any communication diagnostic trouble codes (DTCs) present?
Yes First, CHECK the communication diagnostic trouble codes (DTCs).
For BCM diagnostic trouble codes (DTCs):
REFER TO: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Diagnosis and Testing). For TRM diagnostic trouble codes (DTCs):
REFER TO: Trailer Lamps (417-01 Exterior Lighting, Diagnosis and Testing).
No Check whether light-emitting diodes (LEDs) are installed in place of the rear incandescent bulbs. If LEDs are installed, CONFIGURE (programmable parameters) the turn lamp outage configuration to off. CHECK the system for normal operation. If the turn lamps still flash rapidly or LEDs are not installed in place of the rear incandescent bulbs, GO to D3.
D3 ISOLATE THE TRM (TRAILER MODULE)
  • Ignition OFF.
  • Disconnect TRM C425A.
  • Disconnect TRM C425B.
  • Disconnect TRM C425C.
  • The ignition is on.
  • Activate the suspect turn signals.

Do the turn signals operate correctly?
Yes GO to D10
No For rear turn signals, GO to D11.
For front turn signals, GO to D4.
D4 DETERMINE IF A TURN SIGNAL IS NOT OPERATING
  • The ignition is on.
  • While observing the front turn signal lamps, move the left multifunction switch on the steering column to the left and right turn positions.

Is any turn signal not operating?
Yes GO to D5
No For front turn signals with halogen headlamps or rear turn signals, GO to D11.
For front turn signals with LED headlamps, GO to D7.
D5 TURN LAMP CHECK
  • Ignition OFF.
  • Deactivate the hazard warning function.
  • Disconnect the halogen headlamp, for the inoperative front turn signal, left headlamp C1021 or right headlamp C1041.
  • Disconnect the LED headlamp, for the inoperative front turn signal, left headlamp C1284 or right headlamp C1285.
  • Disconnect the inoperative left rear turn signal, left tail lamp C423 or right tail lamp C422.
  • The ignition is on.
  • While observing the front turn signal lamps, move the left multifunction switch on the steering column to the non-turn position.

Is the turn indicator flashing rapidly?
Yes For halogen headlamps and an inoperative front turn signal, INSTALL a new turn signal lamp.
REFER TO: Front Turn Signal Lamp (417-01 Exterior Lighting, Removal and Installation). For LED headlamps and an inoperative front turn signal, GO to D9.
For an inoperative rear turn signal, INSTALL a new turn signal lamp.
REFER TO: Tail Lamp (417-01 Exterior Lighting, Removal and Installation).
No For halogen headlamps or tail lamps, GO to D11.
For LED headlamps: GO to D6.
D6 CHECK THE FRONT TURN SIGNAL DISABLE CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect the C2280E connector.
  • The ignition is on.
  • Action:
    Click to display the connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1284-12 Ground

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1285-12 Ground

Is there voltage present?
Yes REPAIR the circuit.
No GO to D11
D7 CHECK THE FRONT TURN SIGNAL DISABLE CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Deactivate the hazard warning function.
  • Disconnect the non-operating LH headlamp C1284 or RH headlamp C1285.
  • Disconnect the C2280E connector.
  • Action:
    Click to display the connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1284-12 Ground

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1285-12 Ground

Is the resistance greater than 10000 Ohms?
Yes GO to D8
No REPAIR the circuit.
D8 CHECK THE FRONT HEADLAMP TURN SIGNAL DISABLE CIRCUIT FOR AN OPEN
  • Action:
    Click to display the connectors

    Left turn lamp


    Positive lead Measurement/Action Negative lead
    C1284-12 C2280E-30

    Click to display the connectors

    Right turn lamp


    Positive lead Measurement/Action Negative lead
    C1285-12 C2280E-31

Is the resistance less than 3 ohms?
Yes GO to D9
No REPAIR the circuit.
D9 CHECK THE LIGHT-EMITTING DIODE (LED) CONTROL MODULE
  • Deactivate the hazard warning function.
  • Ignition OFF.
  • Connect the non-operating left headlamp C1284 or right headlamp C1285.
  • Replace the known good LED control module from the opposite headlamp.
  • The ignition is on.
  • CLEAR the diagnostic trouble codes (DTCs), REPEAT the self-test (required to enable the lamp output driver) and cycle the ignition OFF and ON. REPEAT the self-test.
  • Activate the hazard warning lamp function.
  • Operate the system and determine if the concern is still present.

Does the condition persist or are any diagnostic trouble codes (DTCs) returned?
Yes REMOVE the known-good LED control module. GO to D11.
No REMOVE the known good LED control module. INSTALL a new LED control module.
D10 CHECK THE TRM (TRAILER MODULE) FOR CORRECT OPERATION
  • Disconnect and inspect the TRM and all related inline connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • backed-out pins - install new pins as necessary
  • Reconnect the TRM and all related inline connectors. Make sure they are fully seated and locked.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, STOP this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new TRM.
REFER TO: Trailer Module (TRM) (417-01 Exterior Lighting, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
D11 CHECK THE BCM (BODY CONTROL MODULE) FOR CORRECT OPERATION
  • Disconnect and inspect the BCM and all related inline connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • backed-out pins - install new pins as necessary
  • Reconnect the BCM and all related inline connectors. Make sure they are installed and fully seated.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this condition, STOP this test and FOLLOW the service article instructions. If no service article resolves this condition, INSTALL a new BCM.
REFER TO: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
DIAGNOSTIC TEST E: B124C:96, B124C:9E

For circuit and connector information, refer to Wiring Diagrams Cell 92.

Normal Operation and Fault Symptoms

REFER TO: Exterior Lighting - Overview (417-01 Exterior Lighting, Description and Operation).
REFER TO: Exterior Lighting - System Operation and Component Description (417-01 Exterior Lighting, Description and Operation).

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
SCCM B124C:96 Multifunction switch turn signal assembly: internal component fault Continuous memory and on-demand DTC that is set when the SCCM detects an internal fault in the LH multifunction switch on the steering column.
SCCM B124C:9E Turn signal switch pack: stuck in on position Continuous memory and on-demand DTC that is set when the SCCM detects that the LH multifunction switch on the steering column has been in a position for at least 2 minutes.

Possible Sources

  • Wiring, Terminals or Connectors
  • Multifunction Switch on the LH Steering Column
  • SCCM
E1 CHECK THE LEFT MULTIFUNCTION SWITCH ON THE STEERING COLUMN
  • INSTALL a new LH multifunction switch on the steering column.
    Refer to: LH Multifunction Switch on the Steering Column (211-05 Steering Wheel and Column Electrical Components, Removal and Installation).
  • The ignition is on.
  • Using the diagnostic scan tool, perform the SCCM self-test.
  • Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test.
  • Ignition OFF.
  • The ignition is on.
  • Using the diagnostic scan tool, perform the SCCM self-test.

SCCM DTC B124C:96, B124C:9E or return condition?
Yes GO to E2
No The system is operating correctly. The concern was caused by the LH multifunction switch on the steering column.
E2 CHECK THE SCCM (STEERING COLUMN CONTROL MODULE) FOR CORRECT OPERATION
  • Disconnect and inspect all SCCM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • backed-out pins - install new pins as necessary
  • Reconnect the SCCM connectors. Make sure they are fully seated and locked.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, STOP this test and FOLLOW the TSB instructions. If no TSBs apply to this concern, INSTALL a new SCCM.
Refer to: Steering Column Control Module (SCCM) (211-05 Steering Wheel and Column Electrical Components, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.

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