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

AD1-AD2:

AD2-AD4:

AD5-AD7:

AD8-AD9:

Normal Operation
The trailer brake control module is provided voltage at all times by the battery junction box (BJB) fuse 5 (40A) through circuit SBB05 (GY/RD). Ground for the trailer brake control module is provided through circuit GD138 (BK/WH). The trailer brake control module receives voltage from the stoplamp switch through circuit CLS17 (YE/GY) when the brake pedal is applied. When requested, the trailer brake control module sends voltage to the trailer tow connector through circuit CAT19 (BU). Circuit CLS30 (VT/WH) supplies voltage to the trailer brake control module when the parking lamps are on.

Possible Causes
- Fuse
- Circuit CAT19 (BU) open, short to ground or voltage
- Circuit CLS17 (YE/GY) open
- Circuit CLS30 (VT/WH) open
- Circuit GD138 (BK/WH) open
- Circuit SBB05 (GY/RD) open
- Trailer brake control module
- Trailer