Lincoln Nautilus Manuals

Lincoln Nautilus: Exterior Lighting / Autolamps. Diagnosis and Testing

Lincoln Nautilus 2018-2025 Service Manual / Electrical / Lighting / Exterior Lighting / Autolamps. Diagnosis and Testing

DTC Charts

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).

  DTC Description Action
B1A85:11 Ambient Light Sensor: Circuit Short To Ground   GO to Pinpoint Test A
B1A85:13 Ambient Light Sensor: Circuit Open   GO to Pinpoint Test A
For other BCM Diagnostic Trouble Codes (DTCs) -  
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules) .

Symptom Charts

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


Condition Possible Sources Actions
A module does not respond to the diagnostic scan tool
  • Fuse
  • Wiring, terminals or connectors
  • Module
 
REFER to: Communications Network (418-00) .
The autolamps are inoperative/do not operate correctly Refer to the Pinpoint Test   GO to Pinpoint Test A

Pinpoint Tests


PINPOINT TEST A: THE AUTOLAMPS ARE INOPERATIVE/DO NOT OPERATE CORRECTLY

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 (417-01) .

DTC Fault Trigger Conditions

DTC Description Fault Trigger Condition
BCM 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.
BCM 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 Pre-checks

  • Inspect the headlamp switch for damage.
  • Inspect the light sensor for damage.
A1 CHECK THE MANUAL HEADLAMP OPERATION
  • Place the headlamp switch in the HEADLAMPS and then OFF positions.

Do the headlamps operate correctly?
Yes GO to A2
No
REFER to: Headlamps (417-01) .

A2 CHECK FOR VOLTAGE TO THE LIGHT SENSOR
  • Ignition OFF.
  • Disconnect: Autolamp/Sunload Sensor C286 .
  • Ignition ON.
  • Place the headlamp switch in the AUTOLAMPS position.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C286-2   Ground

Is the voltage approximately 5 volts?
Yes GO to A3
No If the voltage is low, GO to A5
If the voltage is high, GO to A7

A3 CHECK THE LIGHT SENSOR FOR GROUND
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C286-2   C286-4

Is the voltage approximately 5 volts?
Yes INSTALL a new autolamp/sunload sensor.
REFER to: Light Sensor (417-01) .
No GO to A4

A4 CHECK THE LIGHT SENSOR GROUND CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect: BCM C2280G.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C286-4   C2280G-22

Is the resistance less than 3 ohms?
Yes GO to A8
No REPAIR the circuit.

A5 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR A SHORT TO GROUND
  • Ignition OFF.
  • Disconnect: BCM C2280G.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C286-2   Ground

Is the resistance greater than 10,000 ohms?
Yes GO to A6
No REPAIR the circuit.

A6 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR AN OPEN
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C286-2   C2280G-24

Is the resistance less than 3 ohms?
Yes GO to A8
No REPAIR the circuit.

A7 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR A SHORT TO VOLTAGE
  • Ignition OFF.
  • Disconnect: BCM C2280G.
  • Ignition ON.
  • Measure:
    Click to display connectors
    Positive Lead Measurement / Action Negative Lead
      C286-2   Ground

Is any voltage present?
Yes REPAIR the circuit.
No GO to A8

A8 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION
  • Disconnect and inspect all BCM and all related in-line 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 and all related in-line 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 service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCM. Refer to the appropriate Removal and Installation procedure in Section 419-10. .
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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