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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 765 (Auxiliary Brake System) >> Diagnosis And Testing >> Auxiliary Brake System - Trailer Brake Control (TBC) Module >> Pinpoint Tests >> Pinpoint Test C : The Message Center Displays Wiring Fault On Trailer >> Pinpoint Test C : The Message Center Displays Wiring Fault On Trailer

Pinpoint Test C : The Message Center Displays Wiring Fault On Trailer

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.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
NOTE: Make sure the trailer brakes are electric-magnet actuated drum type brakes before proceeding with this pinpoint test.

  1. C1 VERIFY TBC MODULE DTCs

    • Verify a trailer is not  connected to the trailer tow connector.
    • Ignition ON.
    • Wait 10 seconds then, using a diagnostic scan tool, clear the TBC module DTCs.
    • Turn the headlights ON.
    • Lightly  apply the brakes for more than 5 seconds.
    • Activate the left turn signal and then the right turn signal.
    • Using a diagnostic scan tool, carry out the TBC module self-test.
    • Turn the headlights OFF.

    Is DTC B148A:11 or B148A:12 present? 

    Yes  GO to  C2.
    No  For all other TBC module DTCs, GO to the DTC Chart: TBC Module . If no DTCs return, the system is operating correctly at this time. INSPECT the 7-pin trailer tow connector for water intrusion, corrosion, pushed-out pins and spread terminals. REPAIR or INSTALL new as necessary. If the 7-pin trailer tow connector is OK, SEND the trailer to an authorized camper or trailer repair facility.

  2. C2 CHECK THE TRAILER TOW CONNECTOR

    • Ignition OFF.
    • Disconnect: Trailer Tow C4099 .
    • Ignition ON.
    • Wait at least 10 seconds for all modules to wake up and prove out.
    • Turn the headlights ON.
    • Lightly  apply the brakes for more than 5 seconds.
    • Activate the left turn signal and then the right turn signal.
    • Using a diagnostic scan tool, carry out the TBC module self-test.
    • Turn the headlights OFF.

    Is DTC B148A:11 or B148A:12 present? 

    Yes  For DTC B148A:11, GO to  C3.For DTC B148A:12, GO to  C4.
    No  INSTALL a new 7-pin trailer tow connector. CLEAR any DTCs present. TEST the system for normal operation.

  3. C3 CHECK THE TBC MODULE PWM OUTPUT CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.
    • Connect: Trailer Tow C4099 .
    • Disconnect: TBC Module C2142 .
    • Turn the headlights ON and measure:
      Positive Lead Measurement / Action Negative Lead
      C2142-14
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
    • Turn the headlights OFF.
    • Lightly  apply the brakes and measure:
      Positive Lead Measurement / Action Negative Lead
      C2142-14
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
    • Activate the left turn signal and measure:
      Positive Lead Measurement / Action Negative Lead
      C2142-14
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
    • Activate the right turn signal and measure:
      Positive Lead Measurement / Action Negative Lead
      C2142-14
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance ever greater than 10, 000 ohms? 

    Yes  GO to  C5.
    No  REPAIR the circuit.

  4. C4 CHECK THE TBC MODULE PWM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.
    • Connect: Trailer Tow C4099 .
    • Disconnect: TBC Module C2142 .
    • Ignition ON.
    • Turn the headlights ON and measure:
      Positive Lead Measurement / Action Negative Lead
      C2142-14
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
    • Turn the headlights OFF.
    • Lightly  apply the brakes and measure:
      Positive Lead Measurement / Action Negative Lead
      C2142-14
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
    • Activate the left turn signal and measure:
      Positive Lead Measurement / Action Negative Lead
      C2142-14
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
    • Activate the right turn signal and measure:
      Positive Lead Measurement / Action Negative Lead
      C2142-14
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  C5.

  5. C5 CHECK FOR CORRECT TBC MODULE OPERATION

    • Ignition OFF.
    • Disconnect and inspect TBC module C2142 (if not previously disconnected).
    • Repair:
      • corrosion (install a new connector or terminal - clean module pins)
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary
    • Connect the TBC module connector and make sure it seats and latches correctly.
    • Test drive the vehicle in the following manner:
      • maintain a speed greater than 5 km/h (3 mph)
      • turn the headlights ON
      • lightly  apply the brakes for more than 5 seconds
      • activate the left and right turn signals
    • Ignition OFF.
    • Ignition ON.
    • Wait at least 10 seconds for all modules to wake up and prove out.
    • Using a diagnostic scan tool, carry out the TBC module self-test.

    Is DTC B148A:11 or B148A:12 present? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new TBC module. REFER to Trailer Brake Control (TBC) Module .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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