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Home >> Audi >> 2015 >> A4 Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 808 (Exterior Lighting System) >> Diagnosis And Testing >> Fog Lamps >> Pinpoint Tests >> PINPOINT TEST G : The Front Fog Lamps Are On Continuously >> PINPOINT TEST G : The Front Fog Lamps Are On Continuously

PINPOINT TEST G : The Front Fog Lamps Are On Continuously

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. G1 CHECK THE HEADLAMP SWITCH INPUT

    • Ignition ON.
    • Deactivate the fog lamps and place the headlamp switch in the OFF position.
    • Using a diagnostic scan tool, view SCCM PIDs.
    • Monitor the SCCM EXT_LMP_SW PID.

    Does the PID indicate that the fog lamps are OFF? 

    Yes  GO to  G4
    No  GO to  G2

  2. G2 CHECK THE HEADLAMP SWITCH

    • Ignition OFF.
    • Disconnect: Headlamp Switch C205 .
    • Carry out the headlamp switch component test. Refer to Component Testing for component testing.

    Does the headlamp switch pass the component test? 

    Yes  GO to  G3
    No  INSTALL a new headlamp switch. REFER to Headlamp Switch .

  3. G3 CHECK THE FOG LAMP SWITCH CIRCUIT FOR A SHORT TO GROUND

    • Disconnect: SCCM C226A .
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C205-5
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  G5
    No  REPAIR the circuit.

  4. G4 CHECK THE BCM FOG LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.
    • Ignition ON.

    Do the fog lamps continue to illuminate? 

    Yes  REPAIR the circuit.
    No  GO to  G5

  5. G5 CHECK FOR CORRECT BCM 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 TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, BCM Hardware Testing .
    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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