2004 chevy exspress

Printed From: the12volt.com
Forum Name: Vehicle Wiring Information & File Requests
Forum Discription: Request Car Alarm, Car Stereo, Cruise Control, Remote Starter, Navigation, Mobile Video, and Other Vehicle Specific Wiring Info, Manuals, Tech Tips
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=50668
Printed Date: May 15, 2025 at 2:39 PM

Topic: 2004 chevy exspress

Posted By: drtoofast
Subject: 2004 chevy exspress
Date Posted: February 23, 2005 at 5:25 AM

could someone please post a wire diagram for a 2004 chevy exspress [no power locks or windows] for a alarm/remote start..I am having conflicting reports on door triggers,brake wire and parking light flash.

thanks very much

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If it too fast your Too old...

Replies:

Posted By: boomer_106
Date Posted: February 23, 2005 at 8:09 AM

Chevrolet

Express

2003-2004

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 or Purple (AC)	Green plug at the PCM**
Parking Lights:	Brown (+)	Fuse box under driver seat
Headlights:	N/A
Diesel Glow Plug:	N/A
Clutch Bypass Wire:	N/A
Notes:	This vehicle is equipped with GM's Passlock II Anti-Theft Security System. Use Universal Alarm Bypass Module part # 2x402 where X can be any number. *The Powertrain Control Module (PCM) is on the driver side fender.

Chevrolet

Express

2003-2004

Alarm and Keyless Entry Wiring Colors and Notes
Function	Vehicle Color	Location
Constant +12 Volts:	RED / Black (x2) (+)	Ignition switch harness
OEM Alarm Disarm:	N/A
Dome Lights/Superv:	Gray/Black or Dk.Blue/White (+)	Black plug at BCM***
OEM Horn:	Tan (-)	Gray plug at BCM***
Power Lock:	Lt.BLue (-)	Blue plug at BCM***
Power Unlock:	White (-)	Blue plug at BCM***
Trunk Release:	N/A
Alarm Input Wire:	Gray/Black or Dk.Blue/White (+)	Black plug at BCM***
Notes:	***The Body Control Module (BCM) is under the passenger side dash, behind the knee bolster.

Posted By: Velocity Motors
Date Posted: February 23, 2005 at 10:21 AM

For the door trigger's there are 3 different wires that trigger the doors, cargo doors & rear doors. Diode isolate the front doors & the side doors & use the trunk trigger for the rear door. The parking light you should use the (-) parking light wire at the switch ( easier to get to ) and the brake wire you can access at the switch. I never went into the BCM or the PCM for anything. You can access all the necessary wires without having to run wires from the passengerside or from under the seat.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA