E 250 V8-5.4L (2008)
W7 Continued
Test X: The Trailer Electric Brakes Are Inoperative/Do Not Operate Correctly
PINPOINT TEST X: THE TRAILER ELECTRIC BRAKES ARE INOPERATIVE/DO NOT OPERATE CORRECTLY
Normal Operation
The trailer brake control module (TBCM) is provided voltage at all times by the battery junction box (BJB) fuse 10 (30A) through circuit 50 (RD).
Ground for the TBCM is provided through circuit 57 (BK). The TBCM receives voltage from the stoplamp switch through circuit 511 (LG) when the
brake pedal is applied. When requested, the TBCM sends voltage to the trailer tow connector through circuit 43 (DB).
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors
-
TBCM
-
Trailer
