GMC 2011 GMG Canyon Owner's Manual page 296

The trailer brake relay is located
on the bottom side of the battery
harness.
Oxygen Sensors,
Air Injection
O2 SNSR
Reactor (AIR)
Relay
Air Conditioning
A/C Control Head,
Power Seats
A/C Air Conditioning
CMPRSR Compressor
Antilock Brake
System (ABS),
ABS ABS Module,
Four Wheel Drive,
Gravity Sensor
ABS 1 ABS 1 (ABS Logic)
ABS 2 ABS 2 (ABS Pump)
AUX PWR 1 Accessory Power 1
AUX PWR 2 Accessory Power 2
BCK/UP Back-up Lights
Climate
BLWR
Control Fan
CLSTR Cluster
CNSTR Fuel Canister
VENT Vent Solenoid