Sierra 2500 Denali 2WD V8-6.0L (2011)
Trailer Towing Relay: Service and Repair
Trailer Brake Control Relay Replacement (3500 Chassis Cab)
Trailer Brake Control Relay Replacement (3500 Chassis Cab)
Removal Procedure
1. Place the ignition switch in the OFF position.
Note: Do not remove the spare wheel hoist.
2. Remove the spare tire and wheel assembly, if necessary. Refer to Spare Wheel Hoist Replacement (See: Maintenance/Wheels and
Tires/Tires/Spare Tire/Service and Repair).
3. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle (See: Maintenance/Vehicle Lifting/Service and Repair).
4. Loosen, but do not remove, the trailer brake control module bracket bolts (1).
5. Disconnect the trailer brake control module and relay electrical connectors.