2003 GMC Sierra alarm/remote start

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=44887
Printed Date: May 17, 2025 at 1:08 AM

Topic: 2003 GMC Sierra alarm/remote start

Posted By: fooser
Subject: 2003 GMC Sierra alarm/remote start
Date Posted: December 10, 2004 at 12:24 PM

I've got a 2003 GMC sierra, 2dr that I want to put an alarm, remote start, and power door locks with keyless entry into. I've ordered the Valet 554R alarm/remote start, a GMDL-BP, and the power door locks from a1electric.com. Will this be all that I need to hook up the system (not including tools)? Does anybody have a wiring diagram for this application? What about any suggestions as to any problems I might run into and ways to avoid them?

I've mechanically inclined and I know how to use a multi-meter so I don’t foresee any issues there. Any suggestions would be appreciated. Also in the future I plan on adding power windows to the truck. While I’ve got everything torn apart can I go ahead and pre-wire the windows?

Thanks,

Jeff

Replies:

Posted By: snguyen
Date Posted: December 10, 2004 at 12:51 PM

GMC

Sierra Pickup

2003

Remote Starter Wiring Colors and Notes
Function	Vehicle Color	Location
Start:	Yellow (+)	Ignition switch harness
Ignition #1:	Pink (+)	Ignition switch harness*
Ignition #2:	White (+)	Ignition switch harness
Ignition #3:	N/A	Ignition switch harness
Accessory:	Orange (+)	Ignition switch harness
Brake Light:	White (+)	Brake pedal switch
Tach Signal:	White (AC)	Instrument cluster or PCM**
Parking Lights:	Gray/Black (-)	Brown plug at BCM***
Headlights:
Diesel Glow Plug:
Clutch Bypass Wire:
Notes:	This vehicle is equipped with GM's PASSLOCK II Anti-Theft System. Use Universal Alarm Bypass Module # 2x402 where X can be any number. You can also use vehicle specific bypass module part # 23545. The Powertrain Control Module (PCM) is in the left front of the engine compartment to the left of the fan shroud. The tach wire is in the green plug in pin # 10. **The Body Control Module (BCM) is under the driver side dash.

GMC

Sierra Pickup

2003

Alarm and Keyless Entry Wiring Colors and Notes
Function	Vehicle Color	Location
Constant +12 Volts:	Red (+)	Ignition switch harness
OEM Alarm Disarm:	Lt.Green (-)	Drivers door module in door
Dome Lights/Superv:
OEM Horn:	BLACK / YELLOW (-)	Steering column harness
Power Lock:	See Note	****
Power Unlock:	See Note	****
Trunk Release:	N/A
Alarm Input Wire:
Notes:	****Use vehicle specific door lock module part # 23561. On base model trucks the lock wire is Lt.Blue(-) and unlock wire is white(-). They are in the Lt.Blue plug at the Body Control Module (BCM).

Posted By: hagmanti
Date Posted: December 10, 2004 at 10:39 PM

Definitely run wires now for the power windows-- getting through the boots is the biggest pain (IMHO) of adding power lock or power windows. And run 2 (or even 4) more than you think you need. It's much easier to take them out than it is to add more later...

Standard advice: take things slow. Solder your connections. Don't connect the alarm to a wire that you have not verified w/ a DMM. Don't plan to use your car that week if this is your first install. (for 2-3 days if this is less than your 4th).

Me