Whether your an expert GMC Sierra car alarm installer, GMC Sierra performance fan or a novice GMC Sierra enthusiast with a 2004 GMC Sierra, a 2004 GMC Sierra 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 GMC Sierra.

The Modified Life staff has taken all its GMC Sierra car alarm wiring diagrams, GMC Sierra car security wiring diagrams, GMC Sierra car alarm wire diagrams, GMC Sierra car security wiring schematics, GMC Sierra car security diagrams, GMC Sierra 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 GMC Sierra 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 GMC Sierra.

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2004 GMC Sierra Car Alarm Wiring Guide

Battery Constant 12v+ Positive Wire (+): Red
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: N/A
Key Sense Wire Location: N/A

Parking Light Negative Wire (-): Gray/Black
Parking Light Negative Wire Location: At BCM, Brown Plug, Pin B2. The BCM (body control module) is located under the driver side of dash. The unit has (6) plugs on it with the purple plug on the back of the unit.

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

Power Door Lock Negative Wire (-): This vehicle will requires a anti-theft bypass module to connect the door locks and bypass the Passlock 2 system. If not connecting up the door locks use a bypass module.
Power Door Lock Negative Wire Location: N/A

Power Door Unlock Negative Wire (-): This vehicle will requires a anti-theft bypass module to connect the door locks and bypass the Passlock 2 system. If not connecting up the door locks use the bypass module.
Power Door Unlock Negative Wire Location: N/A

Door Trigger Negative Wire (-): Gray/Black (Drivers) And Black/White (Passenger). Use Both. On the base model trucks the wires are in the light blue plug at the BCM, pins B4 and B5. On the 4 door trucks the drivers rear door is a light blue/black (-) pin A3 and the passengers rear door is a light green/black (-) pin A2 these wires are in the purple plug at the BCM.
Door Trigger Negative Wire Location: At Each Door Module In Each Door

Dome Light Supervision Wire (-): Gray/Black
Dome Light Supervision Wire Location: At BCM, Black Plug Pin F. The BCM (body control module) is located under the driver side of dash. The unit has (6) plugs on it with the purple plug on the back of the unit.

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 (-): Black/Yellow To Black
Horn Negative Wire Location: At Steering Column Harness

Tachometer Wire Negative Wire (-): White
Tachometer Wire Negative Wire Location: At PCM, Green Plug Pin 36. The PCM (powertrain control module) is located in the left front of the engine compartment to the left of the fan shroud. On diesels the tach wire is pin 55 in the black plug and on the hybrid models the tach wire is pin 35 in the green plug.

Wait To Start Wire (-): Dark Blue (When hooking up a remote starter, if you cannot get the (+) or (-) wait to start wire on the remote starter to work properly, you will then need to disconnect this wire and program the remote starter for the 5, 10, 15 or 20 second wait to start timer in the installation manual.)
Wait To Start Location: At PCM. The PCM (powertrain control module) is located in the left front of the engine compartment to the left of the fan shroud.

Brake Light Positive Wire (+): White
Brake Light Positive Wire Location: At Switch Above Brake Pedal

Factory Alarm Disarm Wire (-): Light Green
Factory Alarm Disarm Wire Location: In Drivers Door Module In Drivers Door

Factory Anti-Theft System: Yellow (+), Black (-) And Red/White (Not Used)
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 GMC Sierra alarm wire color information above is updated as it is submitted by the Modified Life community.