Tests AD: The Trailer Electric Brakes Are Inoperative/Do Not Operate Correctly

PINPOINT TEST AD: 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 5 (40A) through circuit SBB05 (GY/RD). Ground for the TBCM is provided through circuit GD138 (BK/WH). The TBCM receives voltage from the stoplamp switch through circuit CLS17 (YE/GY) when the brake pedal is applied. When requested, the TBCM sends voltage to the trailer tow connector through circuit CAT19 (BU). Circuit CLS30 (VT/WH) supplies voltage to the TBCM when the parking lamps are on.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- TBCM
- Trailer

AD1-AD2:

AD2-AD4:

AD5-AD7:

AD8-AD9: