2003 chevy express van

I have serched the data base and could not find the wiring details for an alarm for this van. Does anyone have any info on this van?Thank You in advance Chuck.

Here's what I found for the Chevy Express, '97-'02. I think this is what you're looking for, but of course you should verify all of the wires yourself, just to be sure. (Sorry about the formatting below). Chevrolet Express 1997-2002 Start: YELLOW IGNITION SWITCH HARNESS * Ignition #1: PINK IGNITION SWITCH HARNESS Ignition #2: WHITE IGNITION SWITCH HARNESS (ECM) Ignition #3: N/A Accessory: ORANGE IGNITION SWITCH HARNESS Brake Light: PURPLE AT SWITCH ABOVE BRAKE PEDAL Tach Signal: WHITE AT COIL TOP OF RIGHT CYL. HEAD Parking Lights: BROWN AT HEADLAMP SWITCH Headlights: YELLOW AT HEADLAMP SWITCH OEM Alarm Disarm: N/A OEM Alarm Arm: N/A Notes: * 1998 Vehicles Are Equipped With GM's PASSLOCK II Anti-Theft System; See Note #113 - Bypassing GM's PASSLOCK II Passive Theft System Diagram. -------------------------------------------------------------------------------- Chevrolet Express 1997-2002 Constant +12 Volts: Red IGNITION SWITCH HARNESS Starter Kill: YELLOW IGNITION SWITCH HARNESS * Ignition +12 Volts: PINK IGNITION SWITCH HARNESS Dome Lights/Superv: PURPLE (-) AT DRIVER'S OR PASSENGER SWITCH OEM Horn: BLACK (-) STEERING COL. OR DK. GREEN (+) AT HORN Power Lock: LIGHT BLUE IN PASSENGER KICK PANEL *** Power Unlock: WHITE IN PASSENGER KICK PANEL *** Trunk Release: N/A Alarm Input Wire: PURPLE (-) AT DRIVER'S OR PASSENGER SWITCH Notes: *** See Note #202 - Positive Pulse Door Lock Diagram. Q: What's the best nation in the world?

A: Donation!     Donate to the12volt.com      

Thanks a lot, this will give me a starting point.   

Most of that seems right, but off the top of my head the horn wire will be tan (-) @ the steering column. Also for an 03 I have a feeling the info listed above for dome lights and info for park lights are incorrect, but to be honest I can't think of what the right stuff is. I think I just grabbed the dome wire at the overhead domelight in the ceiling last time I did one of those. Either way good luck hopefully between all the info you can get it going. Later

Yea, sorry....I didn't realize that wiring I gave you only went up to 2002. I'll see if I run across 2003 anywhere, or maybe someone else has it. Like you said though, this is just a starting point....always check the wires with a multimeter.Q: What's the best nation in the world?

A: Donation!     Donate to the12volt.com      

12volts	RED / black (x2)	+	ignition harness
Starter	yellow	+	ignition harness
Second Starter	N/A
Ignition	pink	+	ignition harness
Second Ignition	white	+	ignition harness
Third Ignition	N/A
Accessory	orange	+	ignition harness
Second Accessory	brown	+	ignition harness
Keysense	lt. green	-	ignition harness
Power Lock	lt. blue	-	pin B5, lt blue plug at BCM

Notes: The BCM (Body Control Module) is under the passenger side dash, behind the knee bolster.

Power Unlock

white

-

pin B10, lt blue plug at BCM

Notes: The BCM (Body Control Module) is under the passenger side dash, behind the knee bolster.

Lock Motor	gray	5wi	driver kick, door harness
Unlock Motor	tan	5wi	driver kick, door harness
Parking Lights+	brown	+	fuse box under driver seat
Parking Lights-	BROWN / white	-	pin B2, brown plug at BCM

Turn Signal(L)	lt. blue/white	+	steering column
Turn Signal(R)	dk. blue/white	+	steering column
Reverse Light	lt. green	+	pin F, black plug at BCM

Notes: The driver door trigger is tan in pin B4, the front passenger and rear cargo door trigger is lt. green in pin A5, and the rear doors or sliding doors trigger is yellow/black in pin A10. Use all three wires and diode isolate each.

Dome Supervision

gray/black or dk. blue/wht

+

pin E, black plug at BCM

Trunk/Hatch Pin	common with door trigger
Hood Pin	N/A
Trunk/Hatch Release	N/A
Power Sliding Door	N/A
Factory Alarm Arm	N/A
Factory Alarm Disarm	N/A
Disarm No Unlock	N/A
Tachometer	white or purple	ac	pin 26, green plug at PCM

Notes: It is white on the 4.3L, and purple on the 4.8L, 5.3L, and 6.0L.

The PCM (Powertrain Control Module) is on the driver side fender.

Brake Wire	white	+	brake pedal switch
Parking Brake	lt. blue	-	pin A7, lt blue plug at BCM

Notes: The Passlock 2 wire colors are yellow, tan, and ORANGE / white (not used).

Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

I just did one of these for remote start a few hours ago. Most is the same as the 2002, but a few things are different. -There are two BROWN / whites at the headlight switch; one of those is negative parking lights---no need to go to the BCM for it. -The ignition and Passlock wires are all to be found at a large black plug right under the dash---it is plainly visible without even taking the dash apart. There happen to be two yellow wires in there---The one for Passlock is near the middle of the plug, NOT the one on the edge. The tan Passlock ground wire is right near the thick brown, orange, and white ignition wires. Also, I've never had a need to power the brown radio wire during remote start. The pink, white, and orange will do fine. -If you go under the carpet on the driver's floor, there's a wire bundle running right in between where the driver's feet would be. There are a lot of light blue and white wires in there---ignore the larger ones. Out of all the smaller wires in there, only one of the light blues is negative unlock. A couple of the whites and another light blue are negative unlock. Both are tested off the PASSENGER lock/unlock switch. -It would be okay to use voltage sense on this car, because it is impossible to overcrank the starter anyway. -I found a spot right on top of the engine doghouse where I could easily lay the brain, and then I just ran the wiring to the left to meet up with the van's ignition harness.