F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
Trailer Brake Control Module: Pinpoint Tests
Test A: DTC B1863 - TBC Ground Open Circuit
Pinpoint Test A: DTC B1863 - TBC Ground Open Circuit
NOTE: Carry out all pinpoint tests without a trailer connected to the vehicle.
Refer to Vehicle/Diagrams, Trailer/Camper Adapter for schematic and connector information.
Normal Operation
The trailer brake control (TBC) module receives fused battery voltage from battery junction box (BJB) fuse 5 (30A) along circuit SBB05 (GY/RD)
and fused ignition voltage from smart junction box (SJB) fuse 33 (10A) along circuit CBP33 (WH/BN). The ground path for the TBC module is
provided along circuit GD115 (BK/GY).
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B1863 TBC Ground Open Circuit - If an open occurs in the wiring, a connector condition causes an open in the ground circuit or if an internal
failure of the TBC module causes an open in the ground circuit, the TBC module will set DTC B1863. The TBC module will also disable trailer
braking and send a TBC FAULT message to the message center (if equipped). A trailer must be connected for this DTC to set.
This pinpoint test is intended to diagnose the following:
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Wiring, terminals or connectors
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TBC module
A1
