Exterior 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

Symptom 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).

Symptom Chart: Headlamps

Symptom Chart

Pinpoint Tests

Exterior lamps inoperative

Refer to Wiring Diagrams Cell 85 for schematic and connector information.

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

• Light Sensor
• BCM

A1 CHECK HEADLAMP MANUAL OPERATION

Turn the headlamp switch to the ON position, then to the OFF position. Do the headlamps operate normally? Yes GO to A2 No REFER TO: Headlamps (417-01 Exterior Lighting, Diagnosis and Testing).

A2 CHECK THE LIGHT SENSOR VOLTAGE

Ignition OFF. Disconnect: Light Sensor C286 (vehicles with DATC). Disconnect: Light Sensor C287 (vehicles equipped with EMTC). The ignition is on. Turn the headlamp switch to the AUTO LAMPS position. Action: Click to display the connectors DATC Positive lead Measurement/Action Negative lead C286-2 Ground Click to display the connectors EMTC Positive lead Measurement/Action Negative lead C287-2 Ground Is the voltage approximately 5 volts? Yes INSTALL a new light sensor. REFER TO: Light Sensor (417-01 Exterior Lighting, Removal and Installation). No GO to A3

A3 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.

Exterior lamps always on

Refer to Wiring Diagrams Cell 85 for schematic and connector information.

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
• Light Sensor
• BCM

Visual Inspection and Preliminary Diagnosis

• Inspect the headlamp switch for damage.
• Inspect the light sensor for damage.

B1 CHECK THE BODY CONTROL MODULE (BCM) DIAGNOSTIC TROUBLE CODES (DTCS)

The ignition is on. Using a scan tool, perform the BCM self-test. Is DTC B1A85:11 or B1A85:13 present? Yes For DTC B1A85:11 GO to B3. For DTC B1A85:13 GO to B5. No GO to B2

B2 CHECK THE VOLTAGE AT THE LIGHT SENSOR (NO DTCS PRESENT)

Ignition OFF. Disconnect: Light Sensor C286 (vehicles with DATC). Disconnect: Light Sensor C287 (vehicles equipped with EMTC). The ignition is on. Turn the headlamp switch to the AUTO LAMPS position. Action: Click to display the connectors DATC Positive lead Measurement/Action Negative lead C286-2 Ground Click to display the connectors EMTC Positive lead Measurement/Action Negative lead C287-2 Ground Is the voltage approximately 5 volts? Yes INSTALL a new light sensor. REFER TO: Light Sensor (417-01 Exterior Lighting, Removal and Installation). No GO to B10

B3 CHECK THE LIGHT SENSOR VOLTAGE (DTC B1A85:11)

Ignition OFF. Disconnect: Light Sensor C286 (vehicles with DATC). Disconnect: Light Sensor C287 (vehicles equipped with EMTC). The ignition is on. Action: Click to display the connectors DATC Positive lead Measurement/Action Negative lead C286-2 Ground Click to display the connectors EMTC Positive lead Measurement/Action Negative lead C287-2 Ground Is the voltage approximately 5 volts? Yes INSTALL a new light sensor. REFER TO: Light Sensor (417-01 Exterior Lighting, Removal and Installation). No GO to B4

B4 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR A SHORT TO GROUND

Ignition OFF. Disconnect: BCM C2280G. Action: Click to display the connectors DATC Positive lead Measurement/Action Negative lead C286-2 Ground Click to display the connectors EMTC Positive lead Measurement/Action Negative lead C287-2 Ground Is the resistance greater than 10000 Ohms? Yes GO to B10 No REPAIR the circuit.

B5 CHECK THE LIGHT SENSOR VOLTAGE (DTC B1A85:13)

Ignition OFF. Disconnect: Light Sensor C286 (vehicles with DATC). Disconnect: Light Sensor C287 (vehicles equipped with EMTC). The ignition is on. Action: Click to display the connectors DATC Positive lead Measurement/Action Negative lead C286-2 Ground Click to display the connectors EMTC Positive lead Measurement/Action Negative lead C287-2 Ground Is the voltage approximately 5 volts? Yes GO to B6 No GO to B8

B6 CHECK THE LIGHT SENSOR GROUND

Action: Click to display the connectors DATC Positive lead Measurement/Action Negative lead C286-2 C286-4 Click to display the connectors EMTC Positive lead Measurement/Action Negative lead C287-2 C287-4 Is the voltage approximately 5 volts? Yes INSTALL a new light sensor. REFER TO: Light Sensor (417-01 Exterior Lighting, Removal and Installation). No GO to B7

B7 CHECK THE LIGHT SENSOR GROUND CIRCUIT FOR AN OPEN

Ignition OFF. Disconnect: BCM C2280G. Action: Click to display the connectors DATC Positive lead Measurement/Action Negative lead C286-4 C2280G-22 Click to display the connectors EMTC Positive lead Measurement/Action Negative lead C287-4 C2280G-22 Is the resistance less than 3 ohms? Yes GO to B10 No REPAIR the circuit.

B8 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF. Disconnect: BCM C2280G. Disconnect: Run/Start Relay. Connect: Click to display connectors Positive lead Measurement/Action Negative lead Run/Start Relay Socket Pin 3 Run/Start Relay Socket Pin 5 Action: Click to display the connectors DATC Positive lead Measurement/Action Negative lead C286-2 Ground Click to display the connectors EMTC Positive lead Measurement/Action Negative lead C287-2 Ground Is there voltage present? Yes REMOVE the fuse jumper wire. REPAIR the circuit. No REMOVE the fusible link. GO to B9

B9 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR AN OPEN

Action: Click to display the connectors DATC Positive lead Measurement/Action Negative lead C286-2 C2280G-24 Click to display the connectors EMTC Positive lead Measurement/Action Negative lead C287-2 C2280G-24 Is the resistance less than 3 ohms? Yes GO to B10 No REPAIR the circuit.

B10 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.