Listed below is the vehicle specific wiring diagram for your car alarm, remote starter or keyless entry installation into your 1987-1990 Volvo 780 . This information outlines the wires location, color and polarity to help you identify the proper connection spots in the vehicle. Please be sure to test all of your wires with a digital multimeter before making any connections. More information on using a multimeter and testing wires please see our Technical Support Area.
PART
COLOR
LOCATION
12 VOLT
CONSTANT
RED (+)
IGNTION SWITCH HARNESS
STARTER
PINK (+)
IGNITION SWITCH HARNESS
STARTER
2
N/A
IGNITION
1
BLUE/RED (+)
IGNITION SWITCH HARNESS
IGNITION
2
N/A
IGNITION
3
N/A
ACCESSORY/HEATER
BLOWER 1
N/A
ACCESSORY/HEATER
BLOWER 2
N/A
KEYSENSE
N/A
PARKING
LIGHTS ( - )
N/A
PARKING
LIGHTS ( + )
WHITE (5-Wire) See NOTE *1
@ HEADLIGHT SWITCH, See DIAGRAM
POWER LOCK
YELLOW (TYPE C)
IN DRIVERS KICK PANEL
POWER UNLOCK
BROWN (TYPE C)
IN DRIVERS KICK PANEL
DOOR TRIGGER
BROWN/BLACK (-)
IN DRIVERS KICK PANEL
DOMELIGHT
SUPERVISION
USE DOOR TRIGGER
TRUNK RELEASE
N/A
SLIDING
POWER DOOR
N/A
HORN
YELLOW (-) or BLUE/BLACK (-)
@ STEERING COLUMN HARNESS
TACH
RED/WHITE
@ IGNITION COIL
WAIT TO
START LIGHT
N/A
BRAKE
BLUE/RED (+)
@ SWITCH ABOVE BRAKE PEDAL
FACTORY
ALARM DISARM
N/A
ANTI-THEFT
N/A
EXTRA
INFORMATION
NOTE *1 the (+) POSITIVE PARKING LIGHT wire on this vehicle needs to be ISOLATED, and will require an EXTRA RELAY, PART #775, to connect, See DIAGRAM.