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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 741 (Exterior Lighting System) >> Diagnosis And Testing >> Reversing Lamps >> Pinpoint Tests >> PINPOINT TEST AC : The Reversing Lamps Are On Continuously >> PINPOINT TEST AC : The Reversing Lamps Are On Continuously

PINPOINT TEST AC : The Reversing Lamps Are On Continuously

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. AC1 CHECK THE PCM TRANSMISSION RANGE PID

    • Using a diagnostic scan tool, view the PCM PIDs.
    • Monitor the PCM Transmission Range (TR) PID while placing vehicle in all gears.

    Does the PID indicate REVERSE when REVERSE was not selected? 

    Yes  REFER to Automatic Transmission External Controls to diagnose the transmission range input.
    No  GO to  AC2

  2. AC2 CHECK THE BCM OUTPUT

    • Ignition OFF.
    • Ignition ON.

    Do the reversing lamps continue to illuminate? 

    Yes  GO to  AC3
    No  GO to  AC5

  3. AC3 CHECK THE TRAILER TOW REVERSING LAMPS RELAY

    • Ignition OFF.
    • Disconnect: Trailer Tow Reversing Lamps Relay.
    • Ignition ON.

    Do the reversing lamps continue to illuminate? 

    Yes  GO to  AC4
    No  INSTALL a new trailer tow reversing lamps relay.

  4. AC4 CHECK THE AUTO-DIMMING INTERIOR REAR VIEW MIRROR

    • Ignition OFF.
    • Disconnect: Auto-Dimming Interior Rear View Mirror C911 .
    • Ignition ON.

    Do the reversing lamps continue to illuminate? 

    Yes  REPAIR the BCM reversing lamps output circuit for a short to voltage.
    No  INSTALL a new auto-dimming interior rear view mirror. REFER to Rear View Mirrors .

  5. AC5 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, Refer to 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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