Whether your an expert Chevrolet Express car alarm installer, Chevrolet Express performance fan or a novice Chevrolet Express enthusiast with a 2004 Chevrolet Express, a Chevrolet Express car alarm wiring diagram can save yourself a lot of time. One of the most time consuming tasks with installing an after market car alarm, car security, car remote start, automatic remote starter, shock sensor, tilt sensor, car alarm sensor or any auto alarm is identifying the correct color car security wires for a 2004 Chevrolet Express headlight bulb size you need for your low beam or high beam and save time. Also, find your other car light bulb sizes including your fog light, reverse light, turn signal, brake light and more. It’s that easy!
The Modified Life staff has taken all its Chevrolet Express car alarm wiring diagrams, Chevrolet Express car security wiring diagrams, Chevrolet Express car alarm wire diagrams, Chevrolet Express car security wiring schematics, Chevrolet Express car security diagrams, Chevrolet Express remote starter wiring diagrams and cataloged them online for our visitors to use for free. Our automotive wiring diagrams allow you to enjoy your new auto security electronics rather than spend countless hours trying to figure out which wires goes where.
Feel free to use any Chevrolet Express auto alarm 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 and most of the auto security wiring diagrams listed on our enthusiast website are submitted by the Modified Life community. 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 2004 Chevrolet Express.
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2004 Chevrolet Express Car Security Wiring Information
Battery Constant 12v+ Positive Wire (+): Red/Black
Battery Constant 12v+ Positive Wire Location: Ignition Switch Harness
Starter Positive Wire (+): Yellow
Starter Positive Wire Location: Ignition Switch Harness
Second Starter Positive Wire (+): N/A
Second Starter Positive Wire Location: N/A
Ignition Positive Wire (+): Pink
Ignition Positive Wire Location: Ignition Switch Harness
Second Ignition Positive Wire (+): White (This wire must be connected as ignition #2 for remote starting.)
Second Ignition Positive Wire Location: Ignition Switch Harness
Third Ignition Positive Wire (+): N/A
Third Ignition Positive Wire Location: N/A
Accessory Positive Wire (+): Orange
Accessory Positive Wire Location: Ignition Switch Harness
Second Accessory Positive Wire (+): N/A
Second Accessory Positive Wire Location: N/A
Key Sense Wire (-): Light Green
Key Sense Wire Location: Ignition Switch Harness
Parking Light Negative Wire (-): Brown/White
Parking Light Negative Wire Location: At BCM, Brown Plug, Pin B2. The BCM (body control module) is located under the passenger side of the dash, behind the knee bolster.
Parking Light Positive Wire (+): Brown
Parking Light Positive Wire Location: At Fuse Box Under Drivers Seat
Power Door Lock Negative Wire (-): Light Blue
Power Door Lock Negative Wire Location: At BCM Light Blue Plug, Pin B5. The BCM (body control module) is located under the passenger side of the dash, behind the knee bolster.
Power Door Unlock Negative Wire (-): White
Power Door Unlock Negative Wire Location: At BCM, Light Blue Plug, Pin B10. The BCM (body control module) is located under the passenger side of the dash, behind the knee bolster.
Door Trigger Negative Wire (-): This vehicle has 3 door triggers, the drivers door is a tan (-) pin B4, the passenger door and rear cargo door is a light green (-) and the rear doors and sliding door is a yellow/black (-) in pin A10. When connecting to an alarm system, use all 3 and diode
isolate.
Door Trigger Negative Wire Location: At BCM, Light Blue Plug. The BCM (body control module) is located under the passenger side of the dash, behind the knee bolster.
Dome Light Supervision Wire (+): Gray/Black or Dark Blue/White
Dome Light Supervision Wire Location: At BCM, Black Plug, Pin E. The BCM (body control module) is located under the passenger side of the dash, behind the knee bolster.
Trunk Release Negative Wire (-): N/A
Trunk Release Negative Wire Location: N/A
Sliding Power Door Wire: N/A
Sliding Power Door Wire Location: N/A
Horn Negative Wire (-): Tan
Horn Negative Wire Location: At BCM, Gray Plug, Pin B9. The BCM (body control module) is located under the passenger side of the dash, behind the knee bolster.
Tachometer Wire Negative Wire (-): White Or Purple
Tachometer Wire Negative Wire Location: At PCM, Green Plug, Pin 26. The PCM (power control module) is located on the drivers side fender. On the 4.3 liter engine the tach wire is white, and on the 4.8 liter, 5.3 liter and 6.0 liter the tach wire is purple.
Wait To Start Wire: N/A
Wait To Start Location: N/A
Brake Light Positive Wire (+): White
Brake Light Positive Wire Location: At Switch Above Brake Pedal
Factory Alarm Disarm Wire (-): N/A
Factory Alarm Disarm Wire Location: N/A
Factory Anti-Theft System: Yellow (+) and Black (-) or Tan (-)
Factory Anti-Theft System Location: GM Passlock 2 System. These wires exit the ignition switch tumbler together and are in the main ignition switch harness in the column.
The 2004 Chevrolet Express alarm wire color and location information above is updated as it is submitted by the Modified Life community.