99 sonoma alarm and remote entry install

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=22837
Printed Date: May 16, 2025 at 10:09 PM

Topic: 99 sonoma alarm and remote entry install

Posted By: sonomaguy99
Subject: 99 sonoma alarm and remote entry install
Date Posted: December 14, 2003 at 3:49 PM

Hi,

This is my first time posting anything on this site, i am a new member. I am no stranger to electronics and car alarms and i am going to install an alarm system and a remote start system on my 99 sonoma. My question is wiring the remote start to the truck. I have been told that newer GM vehicles have a secondary ignition wire that i need to add a relay to in order for the remote start to work, as well as a secondary accesory wire i need to wire a relay to also. what colors are the two secondary wires and what purpose do they serve?

Replies:

Posted By: draasch
Date Posted: December 14, 2003 at 7:40 PM

Make:   GMC
Model: Sonoma
Year:    1999
This Database Was Last Updated On:    6/9/2003
Index #: 6263

Alarm
Constant 12 volts RED & RED / WHITE IGNITION SWITCH HARNESS
Ignition 12 volts PINK IGNITION SWITCH HARNESS
Starter YELLOW IGNITION SWITCH HARNESS
Dome Light WHITE (-) AT BODY BUSSED ELECTRICAL CENTER *
Trunk Pin Switch N/A
Parking Lamp L BLUE (+) AT HEADLIGHT SWITCH
Power Lock L BLUE AT RELAYS IN #202
Power Unlock WHITE DRIVER KICK

* Body Bussed Electrical Center Is Located Behind The Driver Dash Above The Driver Kick Panel. #202- See Positive Pulse Door Lock Diagram.

Remote Start
Tach Signal WHITE/ BLACK AT IGNITION CONTROL MODULE * #238
Ignition #2 WHITE IGNITION SWITCH HARNESS
Ignition #3 ORANGE IGNITION SWITCH HARNESS
Accessory BROWN IGNITION SWITCH HARNESS
Neutral Safety NOT GROUNDING TYPE - OEM SWITCH OPENS STARTER CIRCUIT
Brake Light WHITE (+) AT SWITCH ABOVE BRAKE PEDAL
Reverse Light L GREEN (+) AT UNDER HOOD FUSE BOX
Rear Window Defrost N/A

* Ignition Control Module Is Located On The Passenger Side Of The Engine Compartment. #238 - See G.M. PASSLOK II Diagram

-------------
Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt

Posted By: sonomaguy99
Date Posted: December 16, 2003 at 8:18 PM

thank you so much, for that. i finally had a chance to install my alarm and remote start and everything worked right the first time.

my question still remains about the secondary accessory though. Is there one and if there is what is its purpose?

thanks again.