Car Alarm Wiring Diagram and Car Wire Schematics - 2003 Chevrolet Suburban

Whether your an expert installer or a novice enthusiast with a 2003 Chevrolet Suburban, an automotive wiring diagram can save yourself time and headaches. One of the most time consuming tasks with installing a car alarm, remote car starter, car security system or any mobile electronics is identifying the correct wires for a 2003 Chevrolet Suburban.

The Modified Life staff has put their heads together to create an invaluable resource containing car alarm wiring diagram, remote car starter wiring diagram, car wiring diagram and car security wiring diagram. Feel free to use any car alarm wiring diagram or remote car starter wiring diagram that is listed on Modified Life but keep in mind that all information here is provided “as is” without any warranty of any kind. Use of the wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 2003 Chevrolet Suburban.

If you can’t find your car alarm wiring diagram or remote start wire diagram on Modified Life, please feel free to post a car wiring diagram request (Car Alarm Wiring Diagram Request Page) and we’ll do our best to find you the information you need for your mobile installation.

2003 Chevrolet Suburban Car Alarm and Remote Car Starter Wiring Information

Constant 12V+ Wire: Red & Red/White
Constant 12V+ Wire Location: Ignition Switch Harness

Starter Wire (+): Yellow
Starter Wire Location: Ignition Switch Harness

Second Starter Wire (+): N/A
Start Wire Location: N/A

Ignition Wire (+): Pink
Ignition Wire Location: Ignition Switch Harness

Second Ignition Wire: White
Second Ignition Wire Location: Ignition Switch Harness

Accessory Wire: Orange
Accessory Wire Location: Ignition Switch Harness

Second Accessory Wire: Brown
Accessory Wire Location: Ignition Switch Harness

Key Sense Wire (-): Light Green
Key Sense Location: Ignition Switch Harness

Tachometer Wire: White
Tachometer Wire Location: Instrument cluster, Pin A5 or PCM. The PCM (Powertrain Control Module) is in the left front of the engine compartment to the left of the fan shroud. The tach wire is in the green plug, pin 10. For tach can also go to any of the ignition coils or injectors and use the wire that is NOT pink, black, or brown.

Door Lock Wire (-): Requires an aftermarket GM Door Lock Interface.
Door Lock Wire Location: Upper trim level vehicles may have a door lock switch on the right rear panel. If present use white (-) for lock and lt. blue (-) for unlock.

Door Unlock Wire (-): Requires an aftermarket GM Door Lock Interface.
Door Unlock Wire Location: Upper trim level vehicles may have a door lock switch on the right rear panel. If present use white (-) for lock and lt. blue (-) for unlock.

Door Trigger Wire (-): The driver door trigger is gray/black at the driver door module in the door. The RF door trigger is black/white at the passenger door module in the door. The LR door trigger is lt. blue/black, pin A3, and the RR is lt. green/black, pin A2, they are in the purple plug at the BCM. Use all four wires and diode isolate each.
Door Trigger Wire Location: The BCM (Body Control Module) is under the driver side dash. It has 6 plugs in it, the purple plug is on the back.

Dome Supervision Wire: Gray/Black
Dome Supervision Wire Location: BCM, Black Plug, Pin E. The BCM (Body Control Module) is under the driver side dash. It has 6 plugs in it, the purple plug is on the back.

Headlights Wire (-): N/A
Headlights Wire Location: N/A

Parking Light Positive Wire (+): Brown
Parking Light Positive Wire Location: Driver Kick Panel

Parking Light Negative Wire (-): Gray/Black
Parking Light Negative Wire Location: Switch or BCM, Brown Plug, Pin B2. The BCM (Body Control Module) is under the driver side dash. It has 6 plugs in it, the purple plug is on the back.

Trunk/Hatch Pin Wire (-): Pink/Black
Trunk/Hatch Pin Wire Location: BCM, Purple Plug, Pin A1. The BCM (Body Control Module) is under the driver side dash. It has 6 plugs in it, the purple plug is on the back.

Hood Pin Wire (-): N/A
Hood Pin Wire Location: N/A

Trunk/Hatch Release Wire (-): N/A
Trunk/Hatch Release Wire Location: N/A

Factory Alarm Arm Wire: Arms with lock.
Factory Alarm Arm Wire Location: N/A

Factory Alarm Disarm Wire (-): Light Green
Factory Alarm Disarm Wire Location: Driver door module in door.

Factory Alarm Disarm but No Unlock Wire (-): N/A
Factory Alarm Disarm Wire Location: N/A

Horn Trigger Wire (-): Black/Yellow to Black
Horn Trigger Wire Location: Column or BCM, Gray Plug, Pin B9. The BCM (Body Control Module) is under the driver side dash. It has 6 plugs in it, the purple plug is on the back.

Brake Wire (+): White
Brake Wire Location: Brake Pedal Switch

Emergency Parking Brake Wire (+): Light Blue
Emergency Parking Brake Wire Location: Parking Brake Switch or BCM, Light Blue Plug, Pin A7. The BCM (Body Control Module) is under the driver side dash. It has 6 plugs in it, the purple plug is on the back.