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MERCEDES BENZ 420 SEL
MODEL YEAR(S
420 SEL 1986-1991
KEY T-HARNESS IMMOBILIZER
N/A N/A N/A
PART COLOR LOCATION DIAGRAM
12 VOLT CONSTANT RED (+) @ IGNITION SWITCH HARNESS
STARTER PURPLE (+) @ IGNITION SWITCH HARNESS
STARTER 2 N/A
IGNITION 1 PINK/BLACK (+) @ IGNITION SWITCH HARNESS
IGNITION 2 PINK/GREEN (+) (2nd ACCESSORY @ IGNITION SWITCH HARNESS
IGNITION 3 N/A
ACCESSORY/HEATER BLOWER 1 PINK/YELLOW (+) @ IGNITION SWITCH HARNESS
ACCESSORY/HEATER BLOWER 2 N/A
KEYSENSE N/A
PARKING LIGHTS ( - ) N/A
PARKING LIGHTS ( + ) GREEN/WHITE (+) and GRAY (+) Use both, See NOTE #1 @ HEADLIGHT SWITCH 17044_420-SEL_DUAL PARKING LIGHT DIAGRAM.pdf
POWER LOCK BLUE or GREEN, See NOTE #2 See DIAGRAM 24464_420SEL_VACUUM LOCKS.pdf
POWER UNLOCK LOCK/UNLOCK are Same wire, See NOTE #2 IN DRIVERS KICK PANEL
LOCK MOTOR WIRE N/A
DOOR TRIGGER BROWN/GRAY (-) and BROWN/GRAY/BLACK (-) Use both, See NOTE #3 @ PIN SWITCHES 24464_420SEL_(-) NEGATIVE DOOR PIN ISOLATION CIRCUIT.pdf
DOMELIGHT SUPERVISION BROWN/GRAY (-) @ PASSENGERS PIN SWITCH
TRUNK RELEASE N/A
SLIDING POWER DOOR N/A
HORN BLACK/PINK (+) @ STEERING COLUMN HARNESS
TACH BLACK (AC) @ IGNITION COIL
WAIT TO START LIGHT N/A
BRAKE BLACK/RED (+) @ BRAKE PEDAL SWITCH
FACTORY ALARM DISARM GREEN/YELLOW (-) @ THEFT MODULE in PASSENGERS footwell
ANTI-THEFT N/A
NOTES
NOTE #1: this vehicle has 2 Parking Light wires that will require 2 extra Relays part #775, to connect, See DIAGRAM.





NOTE #2: this vehicle has a Vacuum Door Locking System that will requires 2 extra relays part #775, the wire is a the Drivers kick panel or at the pump under the rear seat, to connect, See DIAGRAM. These wires are in a BLACK tube comming out of the Drivers Door.







NOTE #3: the BROWN/GRAY (-) is at the RIGHT PIN SWITCH is for the FRONT DOORS, the BROWN/GRAY/BLACK (-) is at the REAR PIN SWITCH is for the REAR DOORS When connecting to an ALARM SYSTEM, use both DOOR TRIGGER wires and DIODE ISOLATE. to connec, See DIAGRAM
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