Chevrolet 2009 Colorado Owner's Manual page 360

The trailer brake relay is located on the bottom side of
the battery harness.
Fuses
Oxygen Sensors, Air Injection
O2 SNSR
Reactor (AIR) Relay
Air Conditioning Control Head,
A/C
Power Seats
A/C CMPRSR Air Conditioning Compressor
Antilock Brake System (ABS),
ABS ABS Module, Four-Wheel Drive,
Gravity Sensor
ABS 1 ABS 1 (ABS Logic)
5-110
Usage
Fuses
ABS 2 ABS 2 (ABS Pump)
AUX PWR 1 Accessory Power 1
AUX PWR 2 Accessory Power 2
BCK/UP Back-up Lights
BLWR Climate Control Fan
CLSTR Cluster
CNSTR VENT Fuel Canister Vent Solenoid
Cruise Control Switch, Inside
Rearview Mirror, Transfer Case
CRUISE
Control Module, Brake Switch,
Clutch Disable
DR/LCK Power Door Locks (If Equipped)
DRL Daylight Running Lamps
Mass Air Flow (MAF) Sensor,
ERLS Can Purge Solenoid, Air Injector
Reactor (AIR) Relay
ETC Electronic Throttle Control (ETC)
FOG/LAMP Fog Lamps (If Equipped)
Front Park/Turn Lamps, Driver and
FRT PRK
Passenger Side Power Window
LAMP
Switches Lighting
FRT/AXLE Front Axle Actuator
FSCM Fuel System Control Module
BACKUP LAMP Backup Lamp
HORN Horn
Usage