Brake Lamps. Diagnosis and Testing

DTC Chart: BCM

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).

DTC Chart

Trouble Code	Description	Action
B1115:11	Center high mounted stop lamp: short to ground	GO to Pinpoint Test B
B1115:15	High Mounted Stop Lamp Control: Short to Battery or Open	If the lamp does not operate, GO to Pinpoint Test B. If the lamp is always on, GO to Pinpoint Test C.
B1444:15	Left rear stop/tail lamp output: short to battery or open	If the lamp does not operate, GO to Pinpoint Test B. If the lamp is always on, GO to Pinpoint Test C.
B1448:11	Right rear stop/tail lamp output: short to ground	GO to Pinpoint Test B
B1448:15	Right rear stop/tail lamp output: short to battery or open	If the lamp does not operate, GO to Pinpoint Test B. If the lamp is always on, GO to Pinpoint Test C.
C0040:12	Brake pedal switch "A": short to battery	GO to Pinpoint Test C
U1000:00	Solid State Driver Protection Active - Driver Disabled: No Subtype Information	The module has temporarily disabled the output due to excessive current draw (for example, a short to ground). The BCM cannot turn the output on until the cause of the short circuit is corrected. FIRST, REFER to all other diagnostic trouble codes (DTCs). After the cause is corrected, CLEAR the diagnostic trouble codes (DTCs). REPEAT the self-test. For more information on BCM FET protection, see REFER TO: Multifunction Electronic Modules - System Operation and Component Description (419-10 Multifunction Electronic Modules, Description and Operation).
U3000:49	Control Module: Internal Electronic Failure	The module has permanently disabled the output due to excessive current draw (for example, a short to ground) that exceeded the limits the BCM can withstand. The cause of the excessive current draw MUST be corrected before installing a new BCM. FIRST, REFER to all other diagnostic trouble codes (DTCs). After the cause is corrected, Click here to access the guided procedure (BCM). This Pinpoint Test requires Internet Explorer version 11 or later. For additional information on BCM field effect transistor (FET) protection, refer to Refer to: Module-Controlled Functions - System Operation and Component Description (419-10 Multifunction Electronic Modules, Description and Operation).

Symptom Chart

Symptom Chart: Stop Lamps

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 Chart

Pinpoint Tests

All brake lamps inoperative

For circuit and connector information, refer to Wiring Diagrams Cell 90.

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

• Fuse
• Wiring, Terminals or Connectors
• Stop Lamp Switch
• BCM

Visual Inspection and Preliminary Diagnosis

• Check that BJB fuse 54 (10A) is OK.

A1 CHECK THE BRAKE LAMP SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF. Disconnect: Brake Pedal Position Switch C278. Action: Click to display the connectors Positive lead Measurement/Action Negative lead C278-1 Ground Is the voltage greater than 11 volts? Yes GO to A2 No CHECK BJB fuse 54 (10A). If OK, REPAIR the circuit. If not OK, REFER TO the Wiring Diagrams Manual to determine possible causes of the short circuit.

A2 BRAKE LAMP SWITCH BYPASS

Connect: Click to display connectors Positive lead Measurement/Action Negative lead C278-1 C278-4 The ignition is on. Do the stoplamps illuminate? Yes REMOVE the fused jumper wire. INSTALL a new stoplamp switch. REFER to: Stoplamp Switch (417-01 Exterior Lighting, Removal and Installation). No LEAVE the fusible link connected. GO to A3.

A3 CHECK THE BRAKE PEDAL POSITION SWITCH INPUT CIRCUIT FOR AN OPEN

Ignition OFF. Disconnect: BCM C2280H. Action: Click to display the connectors Positive lead Measurement/Action Negative lead C2280H-1 Ground Is the voltage greater than 11 volts? Yes REMOVE the fusible link. GO to A4. No REMOVE the fused jumper wire. REPAIR the circuit.

A4 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 the TSBs do not resolve the concern, Click here to access the guided procedure (BCM). Internet Explorer version 11 or later is required to perform this Pinpoint test. 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.

One or more brake lamps inoperative

For circuit and connector information, refer to Wiring Diagrams Cell 90.

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

Possible Sources

• Rear Lamp Assembly
• Wiring, Terminals or Connectors
• High Mounted Stop Lamp
• BCM

B1 IDENTIFY THE INOPERATIVE BRAKE LAMP

The ignition is on. Depress the brake pedal and observe the stop lamps. Are all brake lamps inoperative? Yes GO to Pinpoint Test A No For the high mounted stop lamp, GO to B2. For the rear stop lamp, GO to B7.

B2 CHECK THE CENTER HIGH-MOUNTED STOP LAMP VOLTAGE

Ignition OFF. Disconnect: Upper Stop Lamp C475. The ignition is on. While depressing the brake pedal, measure: Click to display connectors Positive lead Measurement/Action Negative lead C475-1 Ground Is the voltage greater than 11 volts? Yes GO to B4 No GO to B3

B3 REPEAT THE ON-DEMAND SELF-TEST AND CHECK THE HIGH MOUNTED STOP LAMP VOLTAGE

Ignition OFF. 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. While depressing the brake pedal, measure: Click to display connectors Positive lead Measurement/Action Negative lead C475-1 Ground Is the voltage greater than 11 volts? Yes INSTALL a new high-mounted stoplamp. REFER to: High-Mounted Stoplamp (417-01 Exterior Lighting, Removal and Installation). No GO to B5

B4 CHECK THE HIGH MOUNTED STOP LAMP GROUND CIRCUIT FOR AN OPEN

While depressing the brake pedal, measure: Click to display connectors Positive lead Measurement/Action Negative lead C475-1 C475-2 Is the voltage greater than 11 volts? Yes INSTALL a new high-mounted stoplamp. REFER to: High-Mounted Stoplamp (417-01 Exterior Lighting, Removal and Installation). No REPAIR the circuit.

B5 CHECK THE HIGH MOUNTED STOP LAMP POWER CIRCUIT FOR A SHORT TO GROUND

Ignition OFF. Disconnect: BCM C2280D. Action: Click to display the connectors Positive lead Measurement/Action Negative lead C475-1 Ground Is the resistance greater than 10000 Ohms? Yes GO to B6 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 cycle the ignition OFF and ON. CHECK the system for normal operation. If DTC U3000:49 is present, Click here to access the guided procedure (BCM). Internet Explorer version 11 or later is required to perform this Pinpoint test.

B6 CHECK THE HIGH MOUNTED STOP LAMP POWER CIRCUIT FOR AN OPEN

Action: Click to display the connectors Positive lead Measurement/Action Negative lead C475-1 C2280D-13 Is the resistance less than 3 ohms? Yes GO to B12 No REPAIR the circuit.

B7 CHECK THE REAR LAMP ASSEMBLY VOLTAGE

Ignition OFF. Disconnect: Left Rear Lamp Assembly C412 or Right Rear Lamp Assembly C415, whichever is not operating. The ignition is on. While depressing the brake pedal, measure: Click to display connectors Left Rear Lamp Positive lead Measurement/Action Negative lead C412-1 Ground Click to display the connectors Right Rear Lamp Positive lead Measurement/Action Negative lead C415-1 Ground Is the voltage greater than 11 volts? Yes GO to B9 No GO to B8

B8 REPEAT THE ON-DEMAND SELF-TEST AND CHECK THE REAR LAMP ASSEMBLY VOLTAGE

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. While depressing the brake pedal, measure: Click to display connectors Left Rear Lamp Positive lead Measurement/Action Negative lead C412-1 Ground Click to display the connectors Right Rear Lamp Positive lead Measurement/Action Negative lead C415-1 Ground Is the voltage greater than 11 volts? Yes INSTALL a new rear lamp assembly. REFER TO: Rear Lamp Assembly - 4-Door (417-01 Exterior Lighting, Removal and Installation). No GO to B10

B9 CHECK THE REAR STOP LAMP GROUND CIRCUIT FOR AN OPEN

While depressing the brake pedal, measure: Click to display connectors Left Rear Lamp Positive lead Measurement/Action Negative lead C412-1 C412-4 Click to display the connectors Right Rear Lamp Positive lead Measurement/Action Negative lead C415-1 C415-4 Is the voltage greater than 11 volts? Yes INSTALL a new rear lamp assembly. REFER TO: Rear Lamp Assembly - 4-Door (417-01 Exterior Lighting, Removal and Installation). No REPAIR the circuit.

B10 CHECK THE REAR STOP LAMP POWER CIRCUIT FOR A SHORT TO GROUND

Ignition OFF. Disconnect: BCM C2280D. Action: Click to display the connectors Left Rear Lamp Positive lead Measurement/Action Negative lead C412-1 Ground Click to display the connectors Right Rear Lamp Positive lead Measurement/Action Negative lead C415-1 Ground Is the resistance greater than 10000 Ohms? Yes GO to B11 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 cycle the ignition OFF and ON. CHECK the system for normal operation. If DTC U3000:49 is present, Click here to access the guided procedure (BCM). Internet Explorer version 11 or later is required to perform this Pinpoint test.

B11 CHECK THE REAR STOP LAMP POWER CIRCUIT FOR AN OPEN

Action: Click to display the connectors Left Rear Lamp Positive lead Measurement/Action Negative lead C412-1 C2280D-24 Click to display the connectors Right Rear Lamp Positive lead Measurement/Action Negative lead C415-1 C2280D-23 Is the resistance less than 3 ohms? Yes GO to B12 No REPAIR the circuit.

B12 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, STOP this test and FOLLOW the TSB instructions. If the TSBs do not resolve the concern, Click here to access the guided procedure (BCM). Internet Explorer version 11 or later is required to perform this Pinpoint test. 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.

Brake lamps on constantly

For circuit and connector information, refer to Wiring Diagrams Cell 90.

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

Possible Sources

• Wiring, Terminals or Connectors
• Stop Lamp Switch
• PCM
• BCM

C1 IDENTIFY CONTINUOUSLY ON STOP LAMPS

The ignition is on. Observe the stop lamps. Are all stop lamps on? Yes GO to C3 No GO to C2

C2 CHECK THE BCM (BODY CONTROL MODULE) STOP LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF. Disconnect: BCM C2280D. The ignition is on. Does the applicable stoplamp remain illuminated? Yes REPAIR the faulty circuit. No GO TO C7

C3 CHECK THE BRAKE PEDAL POSITION SWITCH

Ignition OFF. Disconnect: Brake Pedal Position Switch C278. The ignition is on. Do the stoplamps remain illuminated? Yes GO TO C4 No INSTALL a new brake switch. Refer to: Brake Switch (417-01 Exterior Lighting, Removal and Installation).

C4 CHECK THE PCM (POWERTRAIN CONTROL MODULE)

Ignition OFF. Disconnect: PCM C1951B (1.5 L EcoBoost). Disconnect: PCM C1381B (2 L EcoBoost). Disconnect: PCM C175B (2 L Duratec - Hybrid). Disconnect: PCM C1551B (2.5 L Duratec). Disconnect: PCM C1231B (2.7 L EcoBoost). The ignition is on. Do the stoplamps remain illuminated? Yes GO to C5 No GO to C6

C5 CHECK THE BRAKE PEDAL POSITION SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE

The ignition is on. Action: Click to display the connectors Positive lead Measurement/Action Negative lead C278-4 Ground Is there voltage present? Yes REPAIR the circuit. No GO TO C7

C6 CHECK THE PCM (POWERTRAIN CONTROL MODULE) OPERATION

Disconnect and inspect all PCM 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 Connect the PCM 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 the TSBs do not resolve the concern, Click here to access the guided routine (PCM). Internet Explorer version 11 or later is required to perform this Pinpoint test. . 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.

C7 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 the TSBs do not resolve the concern, Click here to access the guided procedure (BCM). Internet Explorer version 11 or later is required to perform this Pinpoint test. 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.