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GMC SONOMA
MODEL YEAR(S
SONOMA 1998-2003
KEY T-HARNESS IMMOBILIZER
N/A N/A GM's PASSLOCK 2 ANTI-THEFT System, See NOTE #1
PART COLOR LOCATION DIAGRAM
12 VOLT CONSTANT RED (+) @ IGNITION SWITCH HARNESS
STARTER YELLOW (+) @ IGNITION SWITCH HARNESS
STARTER 2 N/A
IGNITION 1 PINK (+) @ IGNITION SWITCH HARNESS
IGNITION 2 WHITE (+) See NOTE #5 @ IGNITION SWITCH HARNESS
IGNITION 3 N/A
ACCESSORY/HEATER BLOWER 1 ORANGE (+) @ IGNITION SWITCH HARNESS
ACCESSORY/HEATER BLOWER 2 N/A
KEYSENSE N/A
PARKING LIGHTS ( - ) WHITE (-) @ BCM, LIGHT BLUE plug, See NOTE #2
PARKING LIGHTS ( + ) BROWN (+) @ HEADLIGHT SWITCH or @ BCM, LIGHT BLUE plug, See NOTE #2
POWER LOCK LIGHT BLUE (TYPE A) @ BCM, BROWN plug, See NOTE #2
POWER UNLOCK WHITE (TYPE A) @ BCM, BROWN plug, See NOTE #2
LOCK MOTOR WIRE N/A IN DRIVERS DOOR HARNESS
DOOR TRIGGER See NOTE #3 @ BCM, See NOTE #2 26500_SONOMA_(-) NEGATIVE DOOR PIN ISOLATION CIRCUIT.pdf
DOMELIGHT SUPERVISION TAN (-) @ BCM, PURPLE Plug, Pin B4, See NOTE #2
TRUNK RELEASE N/A
SLIDING POWER DOOR N/A
HORN BLACK (-) @ STEERING COLUMN HARNESS
TACH WHITE (AC) @ PCM, See NOTE #4
WAIT TO START LIGHT N/A
BRAKE WHITE (+) @ STEERING COLUMN HARNESS
FACTORY ALARM DISARM N/A
ANTI-THEFT YELLOW (+), ORANGE/BLACK (-) and RED/WHITE (Not used) GM's PASSLOCK 2 System, these wires exit the Ignition Switch Tumbler together and are in the Main Ignition Switch Harness in the Column.
NOTES
NOTE #1; This vehicle uses GM's PASSLOCK 2 ANTI-THEFT SYSTEM and requires the 791

Bypass Module to REMOTE START,



to order please go to the SECURITY BYPASS MODULES page on this website.









NOTE #2: The BCM (Body Control Module) is located to the RIGHT of the the Gas Pedal

just below the Radio, the plugs on the BCM face the DRIVERS side of the vehicle.





NOTE #3: This vehicle has (2) door trigger wires, the TAN (-) at the PURPLE Plug, Pin B4 is for

the DRIVERS DOOR, and the ORANGE (-) at the PURPLE Plug, Pin B2 is for the

PASSENGER DOOR. When installign an ALARM system use BOTH Door Trigger wires

and DIODE ISOLATE. to connect, See DIAGRAM





NOTE #4: The PCM (Powertrain Control Module) is located on the PASSENGER FENDER. On the

2.2L engine the WHITE tach wire is in a BLACK 80-Pin Plug, Pin 10, and on the 4.3L

engine the tach wire is in a RED 32-Pin plug, Pin 20.





NOTE #5: IMPORTANT !!!!! this wire MUST BE CONNECTED as IGNITION #2 for

REMOTE STARTING!!!!!!
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EXTRA INFORMATION