Vehicle Wiring Details for a
1999 Cadillac Seville
Item Wire Color Polarity Wire Location
12V orange or orn/blk [1 Positive (+) ignition harness
Starter yellow Positive (+) ignition harness
Starter 2 none
Ignition pink Positive (+) ignition harness
2nd Ignition white Positive (+) ignition harness
3rd Ignition none
Accessory orange Positive (+) ignition harness
Accessory 2 brown Positive (+) ignition harness
Tachometer purple/white ign. coil on top of motor
Power Door (Lock)
Wiring Diagram for
[Negative (-)] Door Lock
red/black Negative (-) drivers door lock switch
Power Door (Unlock)
Wiring Diagram for
[Negative (-)] Door Unlock
orange/black Negative (-) drivers door lock switch
Door Trigger [5] Negative (-) [5]
Dome Supervision
Wiring Diagram for
[Negative (-)] Dome
gray Negative (-) underdash light
Headlights white Negative (-) DIM module [4]
Parklight Positive do NOT use
Parklight Negative brown/white Negative (-) DIM module [4]
Wipers white Positive (+) DIM module [4]
Left Front Window
dk. blue - brown drivers door module [2]
Right Front Window
dk. blue - brown passenger door module [3]
Left Rear Window
dk. blue - brown A LR door module
Right Rear Window
dk. blue - brown A RR door module
Trunk/Hatch Pin black Negative (-) RIM module [6]
Hood Pin none
Trunk/Hatch Release
Wiring Diagram for
[Negative (-)] Trunk/Hatch
lt. blue Negative (-) RIM module [6]
Factory Alarm
Factory Alarm
lt. green Negative (-) drivers door module [2]
Horn black Negative (-) DIM module [4]
Brake white Positive (+) low in drivers kick
Door Motor
gray drivers door module [2]
Door Motor
tan drivers door module [2]
Disarm tan passenger door module [3]
Disarm No Unlock
Additional Info:
This vehicle is equipped with the pass-key III immobilizer. Use Commando part number TransMod to bypass. The ignition harness is accessed by removing, but not unplugging the radio. [1]This is a low current 12V source that should not be used to drive any high current positive circuits. [2] The drivers door module is located above the speaker in the drivers door. [3] The passengers door module is located above the speaker in the passenger door. [4] The DIM module is located just in front of the blower motor near the passenger kick. It has three connectors that all exit out of the bottom of the module. [5] The drivers door trigger wire is tan at the drivers door module, and the other door triggers are dk. blue at there respective door modules. [6] The RIM module is located behind the rear seat in the lower corner on the passenger side. [7] The cruise control module is located under the hood at the top center of the firewall. [8] The sunroof motor is located to the rear of the sunroof towards the top center of the rear window. [9] Power varies with the interior light volume.

ATTENTION: This wiring information is being provided free of charge and on an "as is" basis, without any representation or warranty. It is your responsibility to verify any circuit before interfacing with it by using a digital multimeter. GNU Industries, Inc. assumes no responsibility with regards to the accuracy or currency of this information. Proper installation in every case is and remains the responsibility of the installer. GNU assumes no responsibility resulting from an improper installation, even in reliance upon this information.

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