Ford Fusion Manuals

Ford Fusion: Exterior Lighting / Autolamps. Diagnosis and Testing

DTC Chart: BCM

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).


  BCM DTC Chart


DTC Description Action
B1A85:11 Ambient Light Sensor: Circuit Short To Ground   GO to Pinpoint Test B
B1A85:13 Ambient Light Sensor: Circuit Open   GO to Pinpoint Test B

Symptom Chart(s)

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Symptom Chart: Autolamps

  Symptom Chart


Condition Possible Sources Actions
A module does not respond to the scan tool
  • Fuse
  • Wiring, terminals or connectors
  • Module
 
REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).
The autolamps are inoperative Refer to the Pinpoint Test   GO to Pinpoint Test A
The autolamps are on continuously Refer to the Pinpoint Test   GO to Pinpoint Test B

Pinpoint Tests

The Autolamps Are Inoperative


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

Normal Operation and Fault Conditions


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

PINPOINT TEST A : THE AUTOLAMPS ARE INOPERATIVE
A1 CHECK THE MANUAL HEADLAMP OPERATION
  • Place the headlamp switch in the headlamps on and then off positions.

Do the headlamps operate correctly?
Yes GO to A2
No
REFER to: Headlamps (417-01 Exterior Lighting, Diagnosis and Testing).

A2 CHECK FOR VOLTAGE TO THE LIGHT SENSOR
  • Ignition OFF.
  • Disconnect: Light Sensor C286 (vehicles equipped with DATC).
  • Disconnect: Light Sensor C287 (vehicles equipped with EMTC).
  • Ignition ON.
  • Place the headlamp switch in the autolamps on position.
  • Measure:
    Click to display connectors

      DATC


    Positive Lead Measurement / Action Negative Lead
      C286-2 Ford Fusion. Autolamps. Diagnosis and Testing   Ground

    Click to display connectors

      EMTC


    Positive Lead Measurement / Action Negative Lead
      C287-2 Ford Fusion. Autolamps. Diagnosis and Testing   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 FOR CORRECT 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
    • pushed-out pins – install new pins as necessary
  • Reconnect the BCM connectors. Make sure they seat and latch correctly.
  • 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, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern,
Ford Fusion. Autolamps. Diagnosis and Testing   Click here to access Guided Routine (BCM).Ford Fusion. Autolamps. Diagnosis and Testing Internet Explorer version 11 or greater is required to perform this Pinpoint Test.
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.


The Autolamps Are On Continuously


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

Normal Operation and Fault Conditions


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


DTC Description Fault Trigger Conditions
B1A85:11 Ambient Light Sensor: Circuit Short To Ground A continuous memory and on-demand DTC that sets when the BCM detects a short to ground from the light sensor input circuit.
B1A85:13 Ambient Light Sensor: Circuit Open An on-demand DTC that sets when the BCM detects an open or short to voltage from the light sensor input circuit.

Possible Sources

  • Wiring, terminals or connectors
  • Light sensor
  • BCM

Visual Inspection and Diagnostic Pre-checks

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

PINPOINT TEST B : THE AUTOLAMPS ARE ON CONTINUOUSLY
B1 CHECK FOR BCM (BODY CONTROL MODULE) DIAGNOSTIC TROUBLE CODE (DTCS)
  • Ignition ON.
  • Using a diagnostic 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 FOR VOLTAGE TO THE LIGHT SENSOR (NO DTC (DIAGNOSTIC TROUBLE CODE) )
  • Ignition OFF.
  • Disconnect: Light Sensor C286 (vehicles equipped with DATC).
  • Disconnect: Light Sensor C287 (vehicles equipped with EMTC).
  • Ignition ON.
  • Place the headlamp switch in the autolamps on position.
  • Measure:
    Click to display connectors

      DATC


    Positive Lead Measurement / Action Negative Lead
      C286-2 Ford Fusion. Autolamps. Diagnosis and Testing   Ground

    Click to display connectors

      EMTC


    Positive Lead Measurement / Action Negative Lead
      C287-2 Ford Fusion. Autolamps. Diagnosis and Testing   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 FOR VOLTAGE TO THE LIGHT SENSOR (DTC (DIAGNOSTIC TROUBLE CODE) B1A85:11)
  • Ignition OFF.
  • Disconnect: Light Sensor C286 (vehicles equipped with DATC).
  • Disconnect: Light Sensor C287 (vehicles equipped with EMTC).
  • Ignition ON.
  • Measure:
    Click to display connectors

      DATC


    Positive Lead Measurement / Action Negative Lead
      C286-2 Ford Fusion. Autolamps. Diagnosis and Testing   Ground

    Click to display connectors

      EMTC


    Positive Lead Measurement / Action Negative Lead
      C287-2 Ford Fusion. Autolamps. Diagnosis and Testing   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.
  • Measure:
    Click to display connectors

      DATC


    Positive Lead Measurement / Action Negative Lead
      C286-2 Ford Fusion. Autolamps. Diagnosis and Testing   Ground

    Click to display connectors

      EMTC


    Positive Lead Measurement / Action Negative Lead
      C287-2 Ford Fusion. Autolamps. Diagnosis and Testing   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to B10
No REPAIR the circuit.

B5 CHECK FOR VOLTAGE TO THE LIGHT SENSOR (DTC (DIAGNOSTIC TROUBLE CODE) B1A85:13)
  • Ignition OFF.
  • Disconnect: Light Sensor C286 (vehicles equipped with DATC).
  • Disconnect: Light Sensor C287 (vehicles equipped with EMTC).
  • Ignition ON.
  • Measure:
    Click to display connectors

      DATC


    Positive Lead Measurement / Action Negative Lead
      C286-2 Ford Fusion. Autolamps. Diagnosis and Testing   Ground

    Click to display connectors

      EMTC


    Positive Lead Measurement / Action Negative Lead
      C287-2 Ford Fusion. Autolamps. Diagnosis and Testing   Ground

Is the voltage approximately 5 volts?
Yes GO to B6
No GO to B8

B6 CHECK THE LIGHT SENSOR GROUND
  • Measure:
    Click to display connectors

      DATC


    Positive Lead Measurement / Action Negative Lead
      C286-2 Ford Fusion. Autolamps. Diagnosis and Testing   C286-4

    Click to display connectors

      EMTC


    Positive Lead Measurement / Action Negative Lead
      C287-2 Ford Fusion. Autolamps. Diagnosis and Testing   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.
  • Measure:
    Click to display connectors

      DATC


    Positive Lead Measurement / Action Negative Lead
      C286-4 Ford Fusion. Autolamps. Diagnosis and Testing   C2280G-22

    Click to display connectors

      EMTC


    Positive Lead Measurement / Action Negative Lead
      C287-4 Ford Fusion. Autolamps. Diagnosis and Testing   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 Ford Fusion. Autolamps. Diagnosis and Testing Run/Start Relay Socket Pin 5
  • Measure:
    Click to display connectors

      DATC


    Positive Lead Measurement / Action Negative Lead
      C286-2 Ford Fusion. Autolamps. Diagnosis and Testing   Ground

    Click to display connectors

      EMTC


    Positive Lead Measurement / Action Negative Lead
      C287-2 Ford Fusion. Autolamps. Diagnosis and Testing   Ground

Is any voltage present?
Yes REMOVE the fused jumper wire. REPAIR the circuit.
No REMOVE the fused jumper wire. GO to B9

B9 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors

      DATC


    Positive Lead Measurement / Action Negative Lead
      C286-2 Ford Fusion. Autolamps. Diagnosis and Testing   C2280G-24

    Click to display connectors

      EMTC


    Positive Lead Measurement / Action Negative Lead
      C287-2 Ford Fusion. Autolamps. Diagnosis and Testing   C2280G-24

Is the resistance less than 3 ohms?
Yes GO to B10
No REPAIR the circuit.

B10 CHECK FOR CORRECT 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
    • pushed-out pins – install new pins as necessary
  • Reconnect the BCM connectors. Make sure they seat and latch correctly.
  • 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, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern,
Ford Fusion. Autolamps. Diagnosis and Testing   Click here to access Guided Routine (BCM).Ford Fusion. Autolamps. Diagnosis and Testing Internet Explorer version 11 or greater is required to perform this Pinpoint Test.
No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.


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