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Which wires give constant, ignition and ground on a 2004 Chevrolet Express / GMC Savana?
On a 2004 Chevrolet Express / GMC Savana, take constant power from the Red/Black wire at the ignition switch harness, ignition from the Pink wire at the ignition switch harness, and ground to clean, bare body metal. Meter every wire first.
Written by API Signal, fleet GPS and camera installers for 35+ years across Georgia, South Carolina and North Carolina, installing every major telematics and camera brand. Every wire on this page lists its source.
Test every wire with a meter before you tap it
No wiring information is ever guaranteed. Colors and locations change with trim, options and build date, and the manufacturer can change them in the middle of a model year. We share this as a starting point for installers, and you are responsible for confirming every connection on the truck in front of you.
This page covers the 2004 Chevrolet Express and GMC Savana, cargo, passenger and cutaway. The Express and Savana share the same wiring.
The colors come from an installer sheet for a 2004 van, matched against the 2005 sheet. Our own team has not yet metered these on a 2004 van, and each row says so.
OBD-II portUnder the driver dash
Best power spotIgnition switch harness
System voltage12V
Ignition typeKey
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Where do I get constant, ignition and ground on a 2004 Chevrolet Express / GMC Savana?
Take constant, ignition and ground from the same area. On 2003 to 2007 vans, constant, ignition and accessory are all at the ignition switch harness on the steering column.
Option 1 Easiest
Ignition switch harness
Steering column, under the driver dash. Key start.
Constant
Red/Black
Ignition switch harnessAlways hot, 40A. There are two Red/Black wires.
Ignition
Pink
Ignition switch harnessHot in run and start. A second ignition is White.
Ground
Body ground
Body metal under the dashClean, bare metal only. Never the battery negative post.
Accessory
Orange
Ignition switch harnessHot in accessory and run. A second accessory is Brown.
The 2005 sheet asks for relays on the starter circuits. Never tap the starter for power.
Option 2 Under the seat
Fuse box under the driver seat
The body fuse box sits under the driver seat.
Constant
Not found
Use the ignition switch (Option 1)Our sheets give no constant wire at this box for 2003 to 2007.
Park light
Brown
Fuse box under the driver seatOn with the park lights (positive).
The body control module (BCM) sits under the passenger dash, behind the knee bolster.
Power wires from installer wire sheets for 2003, 2004, 2005 and 2007 vans on the12volt (the 2005 sheet fetched twice, matched).
What are the turn signal, reverse and light wires on a 2004 Chevrolet Express / GMC Savana?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Light Blue/White
Turn signal switchFlashes with the left signal.
Right turnPositive +Not yet checked
Dark Blue/White
Turn signal switchFlashes with the right signal. Light Blue/White is left, Dark Blue/White is right.
Park lightPositive +Not yet checked
Brown
Brown/White (switch, negative)
Brown at the fuse box under the driver seat; Brown/White at the BCM brown plug, pin B2On with the park lights.
HeadlightNot foundNot yet checked
Not found
Not foundWe found no headlight wire for 2003 to 2007.
ReversePositive +Not yet checked
Light Green
BCM black plug, pin FHot in reverse.
Dome lightPositive +Not yet checked
Gray/Black
Dark Blue/White
BCM black plug, pin EDome supervision. The 2007 sheet lists either color.
Each chip shows the main insulation color with its stripe. Each source is named on its row.
Where are the brake, door, speed and CAN wires on a 2004 Chevrolet Express / GMC Savana?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
White
Brake pedal switchHot with the pedal pressed.
Driver doorNegative -Not yet checked
Tan
BCM light blue plug, pin B4Door trigger. The 2005 sheet says to diode-isolate the door wires.
Passenger and rear doorsNegative -Not yet checked
Light Green
Yellow/Black (sliding/rear)
BCM light blue plug, pin A5 (passenger and rear cargo); pin A10 (sliding or rear)Door triggers.
Parking brakeNegative -Not yet checked
Light Blue
BCM light blue plug, pin A7Grounds with the parking brake set.
HazardNegative -Not yet checked
White
BCM gray plug, pin A5Hazard switch input.
Lock / unlockNegative -Not yet checked
Light Blue (lock)
White (unlock)
BCM light blue plug, pin B5 (lock), pin B10 (unlock)Lock and unlock inputs.
TachAC signalNot yet checked
White (4.3L)
Purple (V8)
PCM green plug, pin 26White on the 4.3L V6; purple on the 4.8L, 5.3L and 6.0L.
Vehicle speedNot foundNot yet checked
Not found
Not foundWe found no speed wire for 2003 to 2007.
Sources: installer wire sheets for 2003, 2004, 2005 and 2007 Express and Savana vans on the12volt. Headlight, vehicle speed and data wires were not found for 2003 to 2007.
Which years share wiring with the 2004 Chevrolet Express / GMC Savana?
This page2004Installer sheet for a 2004 van.
Same wiring2003, 2005, 2006 and 20072003 to 2007 vans share the same ignition harness and BCM layout; the 2003, 2004, 2005 and 2007 sheets agree.
Not this page2008 and newer2008 brought a new instrument cluster and a new wiring layout. Those years have their own pages.
Where are the fuse boxes and ground points on a 2004 Chevrolet Express / GMC Savana?
Under the driver seatBody fuse blockThe body fuse block sits under the driver seat, with the main power feed at its side.
Under the hoodUnderhood fuse blockWe did not find a fuse map we trust for this van. Check the lid.
Ground pointsClean body metalWe did not find a published ground point. Use clean, bare body metal, never the battery negative post.
Our team has not yet checked the fuse boxes on a van.
Where is the OBD-II port on a 2004 Chevrolet Express / GMC Savana?
OBD II
Diagnostic portOBD-II port: under the driver dashPlug-in GPS trackers and OBD harnesses connect here. Check the port before you plan the install.
Common questions about 2004 Chevrolet Express / GMC Savana wiring
What wire is constant power on a 2004 Chevrolet Express / GMC Savana?
Red/Black at the ignition switch harness. Always hot, 40A. Meter it before you tap it.
What wire is ignition on a 2004 Chevrolet Express / GMC Savana?
Pink at the ignition switch harness. Hot in run and start. Meter it before you tap it.
Where is the reverse wire on a 2004 Chevrolet Express / GMC Savana?
Light Green (positive +) at the BCM black plug, pin F. Hot in reverse. Meter it before you tap it.
Where is the brake wire on a 2004 Chevrolet Express / GMC Savana?
White (positive +) at the brake pedal switch. Hot with the pedal pressed. Meter it before you tap it.
Where is the parking brake wire on a 2004 Chevrolet Express / GMC Savana?
Light Blue (negative -) at the BCM light blue plug, pin A7. Grounds with the parking brake set. Meter it before you tap it.
Which years share wiring with the 2004 Chevrolet Express / GMC Savana?
2003, 2005, 2006 and 2007. 2003 to 2007 vans share the same ignition harness and BCM layout; the 2003, 2004, 2005 and 2007 sheets agree.
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