Symptom Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Diagnostic Methods for information about these practices.

SYMPTOM CHART

Condition	Possible Sources	Action
A module does not respond to the scan tool	Fuse Wiring, terminals or connectors TBC module	REFER to MODULE COMMUNICATIONS NETWORK .
The trailer brakes are inoperative	Refer to the DIAGNOSTIC ROUTINE	Go to PINPOINT TEST A .
The trailer brakes are always engaged	Refer to the DIAGNOSTIC ROUTINE	Go to PINPOINT TEST B .
The message center intermittently displays TRAILER DISCONNECTED or WIRING FAULT ON TRAILER while towing a trailer	Refer to the DIAGNOSTIC ROUTINE	Go to PINPOINT TEST C .
The message center displays TRAILER BRAKE MODULE FAULT	DTCs present	RETRIEVE and RECORD the DTCs. GO to the TBC MODULE DTC CHART .
The message center displays TRAILER BRAKE MODULE FAULT when the vehicle is not equipped with a TBC module	Incorrect IPC configuration	CHECK the service history for recent service actions related to the Instrument Panel Cluster (IPC). If there have been recent service actions with this module, REPEAT the IPC programming procedure using As-Built data as directed by the diagnostic scan tool. If there have been no recent service actions, INSTALL a new IPC. REFER to INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES .
The message center displays WIRING FAULT ON TRAILER	Refer to the DIAGNOSTIC ROUTINE	Go to PINPOINT TEST C .