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door lock wiring guide
The light blue (H1/8) and light green (H1/7) lock wires provide 200mA negative pulses that are used to control
electric door locks. Most common interfaces are described in this section.
type A: (+) 12V pulses from the switch to the factory relays
The correct wires can usually be found in either kick panel. If you cannot get to the switch, and you find a set
of wires that pulse (+)12V alternately on lock and unlock, you must take care to ensure that it is not a Type C
direct-wire system.
Here is a test: Cut the wire which pulses (+)12V on lock, and then operate the switch to unlock.
If all doors unlock, the vehicle uses Type A system.
If you lose all door lock operation in both directions, you are operating the master switch in a Type C system.
If you lose all door lock operation of one or more doors, but not all motors stop operating, and other doors
still work, you have cut a wire leading directly to one or more motors. You must instead find the actual wires
leading to the switch.
Many domestically-made GM vehicles use Type A locks, while almost all domestically-built Fords are Type C (Ford
builds almost no Type A systems). Chrysler builds both Type A and Type C, so use caution.
WARNING! Many more GM locks are Type C than in previous years. The full-size pickups (1989-up),
many of the S10 Blazers, the Corvette, 1995 Cavalier/Sunfire 1993 - and newer, and Camaro/Firebird
all use Type C door locks, and cannot be controlled without a 451M!
To interface two relays, a 451M, or a 453T will be required.
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© 2000 Directed Electronics, Inc. Vista, CA
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