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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 923 (Brake System - Auxiliary Brake System -- F250-F550 Super Duty) >> Diagnosis And Testing >> Auxiliary Brake System - Trailer Brake Control (TBC) Module >> Inspection and Verification

Inspection and Verification

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: A trailer brake emulator tool is available to verify that the TBC module and vehicle wiring are functioning correctly.
  1. Verify the TBC system is correctly installed by checking that the vehicle is equipped with a brake pressure transducer on the master cylinder. If the brake pressure transducer is not present, then the TBC system has been erroneously installed.
  2. Verify the customer concern.
    3. NOTE: The TBC does not function with electric-over-hydraulic or surge trailer brake types.
  3. Verify that the trailer brakes are electric-actuated drum type brakes.
  4. Verify the stoplamps operate correctly by applying and releasing the brake pedal with the ignition switch in the OFF position and the trailer disconnected. If the stoplamps do not operate correctly, refer to EXTERIOR LIGHTING . If the stoplamps operate correctly, proceed to the next step.
  5. Visually inspect for obvious signs of mechanical or electrical damage.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Base brake system
    • Trailer
    • Brake pressure transducer
    • Brake pressure switch
    • Battery junction box (CJB) fuse 12 (12A)
    • Central junction box (CJB) fuse(s)
      • 20 (15A)
      • 28 (10A)
      • 101 (30A)
    • Circuitry
    • Trailer brake control (TBC) module
  6. If the cause is not visually evident, connect the scan tool to the data link connector (DLC) and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  7. If the scan tool still does not communicate with the vehicle, refer to the scan tool operating manual.
  8. Carry out the scan tool data link test. If the scan tool responds with:
    • CAN, ISO, or UBP circuit fault; all electronic control units no response/not equipped, refer to MODULE COMMUNICATIONS NETWORK .
    • No response/not equipped for the TBC, GO to PINPOINT TEST A .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out self-test diagnostics for the TBC and the anti-lock brake system (ABS) module.
  9. If the DTCs retrieved are related to the concern, go to the TRAILER BRAKE CONTROL (TBC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX  or ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX  to continue diagnosis.
  10. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART  to continue diagnosis.
NOTE: Always retrieve the continuous DTCs after running the self-test.
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