Trailer Brake Control Module | Testing and Inspection
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Ignition ON.
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Using the scan tool, clear the DTCs.
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Ignition OFF.
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Ignition ON.
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Enter the following diagnostic mode on the scan tool: Self Test - TBC Module.
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Does DTC C2806 or C2807 return?
Yes
For DTC C2806, GO to F5.
For DTC C2807, GO to F4.
No
For all other DTCs, GO to the Trailer Brake Control (TBC) Module DTC Chart. See: Diagnostic Trouble Code Descriptions
If no DTCs returned, the TBC module and vehicle wiring are operating correctly. SEND the trailer to an authorized camper/trailer repair center.
CLEAR the DTCs. REPEAT the self-test.
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F4 CHECK THE TBC MODULE PWM OUTPUT CIRCUIT FOR A SHORT TO GROUND
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Ignition OFF.
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Disconnect: TBC Module C2142.
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Measure the resistance between C4099-3, circuit CAT19 (BU), harness side and ground.
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Is the resistance greater than 10,000 ohms?
Yes
GO to F7.
No
REPAIR circuit CAT19 (BU). CLEAR the DTCs. REPEAT the self-test.
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F5 CHECK THE TBC MODULE OUTPUT
NOTE: Every 4 seconds a voltage pulse is applied as a trailer connectivity test.
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Make sure the brake pedal is not pressed and the manual slider switch is not being applied.
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Measure the voltage between C4099-3, circuit CAT19 (BU), harness side and ground.
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Is steady voltage indicated?
Yes
REPAIR circuit CAT19 (BU). CLEAR the DTCs. REPEAT the self-test.
No
