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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1594 (Auxiliary Brake System) >> 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 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 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 (BJB) fuse 12 (2A)
    • 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 scan tool's 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.
  9. If the DTCs retrieved are related to the concern, go to the TRAILER BRAKE CONTROL (TBC) 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.
TRAILER BRAKE CONTROL (TBC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTC Description Source Action
B1317 Battery Voltage High TBC Module GO to PINPOINT TEST B .
B1318 Battery Voltage Low TBC Module GO to PINPOINT TEST B .
B1342 ECU is Faulted TBC Module REPAIR all other DTCs. CLEAR the DTCs. TEST the system for normal operation. If the DTC returns, INSTALL a new TBC. REFER to TRAILER BRAKE CONTROL (TBC) MODULE  in this section.
B1863 TBC Ground Open Circuit TBC Module GO to PINPOINT TEST A .
C2797 Brake Pressure Transducer Supply Short to Battery TBC Module GO to PINPOINT TEST C .
C2798 Brake Pressure Transducer Supply Short to Ground TBC Module GO to PINPOINT TEST C .
C2800 Brake Pressure Transducer Sense Circuit Open TBC Module GO to PINPOINT TEST C .
C2801 Brake Pressure Transducer Sense Short to Ground TBC Module GO to PINPOINT TEST C .
C2803 Brake Pressure Transducer Sense Circuit Failure TBC Module GO to PINPOINT TEST C .
C2806 Trailer Brakes Wiring Circuit Short to Battery TBC Module If DTC C2806 is only present with a trailer connected to the trailer tow connector, SEND the trailer to an authorized camper/trailer repair center. If DTC C2806 is present without a trailer connected, RECORD and CLEAR the DTCs. CYCLE the ignition switch and RETRIEVE any DTCs. If DTC C2806 returns (without a trailer connected to the trailer tow connector), GO to PINPOINT TEST D . For all other returning DTCs, CARRY OUT the appropriate action as directed by this index.
C2807 Trailer Brakes Wiring Circuit Short to Ground TBC Module If DTC C2807 is only present with a trailer connected to the trailer tow connector, SEND the trailer to an authorized camper/trailer repair center. If DTC C2807 is present without a trailer connected, RECORD and CLEAR the DTCs. CYCLE the ignition switch and RETRIEVE any DTCs. If DTC C2807 returns (without a trailer connected to the trailer tow connector), GO to PINPOINT TEST D . For all other returning DTCs, CARRY OUT the appropriate action as directed by this index.
C2808 Trailer Brakes Output Overload TBC Module If DTC C2808 is only present with a trailer connected to the trailer tow connector, SEND the trailer to an authorized camper/trailer repair center. If DTC C2808 is present without a trailer connected, RECORD and CLEAR the DTCs. CYCLE the ignition switch and RETRIEVE any DTCs. If DTC C2808 returns (without a trailer connected to the trailer tow connector), GO to PINPOINT TEST D . For all other returning DTCs, CARRY OUT the appropriate action as directed by this index.
U1900 CAN Communication Bus Fault-Receive Error TBC Module GO to PINPOINT TEST A .

For a complete master list of DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES .

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