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GMC SONOMA
MODEL YEAR(S
SONOMA 2004
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 (+) and RED/WHITE (+) @ 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 LIGHT GREEN (-) @ IGNITION SWITCH HARNESS
PARKING LIGHTS ( - ) WHITE (-) @ BCM, LIGHT BLUE plug, Pin A5, See NOTE #2
PARKING LIGHTS ( + ) BROWN (+) @ BCM, LIGHT BLUE plug, Pin B6, See NOTE #2
POWER LOCK LIGHT BLUE (TYPE A) @ BCM, BROWN plug, Pin A4, See NOTE #2
POWER UNLOCK WHITE (TYPE A) @ BCM, BROWN Plug, Pin A3, See NOTE #2
LOCK MOTOR WIRE N/A
DOOR TRIGGER See NOTE #3 @ BCM, PURPLE Plug, See NOTE #2 5899_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 (-) @ BCM, BROWN plug, Pin A9, See NOTE #2
TACH WHITE (AC) @ PCM, BLUE Plug Pin 49, See NOTE #4
WAIT TO START LIGHT N/A
BRAKE WHITE (+) @ SWITCH ABOVE BRAKE PEDAL
FACTORY ALARM DISARM LIGHT GREEN (-) @ BCM, PURPLE plug, Pin B3, See NOTE #2
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 installing 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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