Factory Accessory wiring colors and locations

Written by Mike Napurano, Member 1
Applies to the following vehicles: 1997+ Grand Prix
Created 10/12/2004

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2004 Grand Prix

Note: The BCM (Body Control Module) is below the driver side dash to the left of the steering column. The TAC (Throttle Actuator Control) module is on top of the engine on the throttle assembly.

Item Wire Color Polarity Wire Location
12voltsred (x3) + back of fusebox, pass. dash
Ignition pink + ign harn or pin 22, conn. C1 at BCM
Parking Lights+ brown + front of fusebox, pass. dash
Parking Lights- brown/white - pin 8, 18 pin plug at BCM
Headlight white - pin 7, 18 pin plug at BCM
Trunk/Hatch Release lt. blue + pin 45, conn. C2 at BCM
Speed Sense dk. green pin 4 at TAC module
Wipers lt. blue (L), lt. green (H) - pin 5 & 18, 18P plug at BCM
LF Window up/dn dk. blue - brown A driver window switch
RF Window up/dn lt. blue - tan A driver kick, door harness
LR Window up/dn dk. green - purple A driver kick, door harness
RR Window up/dn lt. green - purple A driver kick, door harness
Sun Roof open/close blue - green A sunroof motor
Sun Roof Limit/close red - sunroof motor

1998 Grand Prix

Item Wire Color Polarity Wire Location
12voltsred & red/white + ignition harness
Ignition pink + ignition harness
Parking Lights+ brown headlight switch
Headlight yellow + headlight switch
Trunk/Hatch Release black/white + trunk release switch
Speed Sense dk.green Located at a 10 pin plug on the front of the drivers strut tower. There are two dk.green wires there, use the one in the corner of the plug.
Wipers gray + steering column
LF Window up/dn dk. blue - brown A LF window motor in door
RF Window up/dn lt. blue - tan A driver kick panel
LR Window up/dn dk. green - purple A driver kick panel
RR Window up/dn lt. green - purple A driver kick panel

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