Door Lock Harness (H4) Wire Connection Guide - Directed Electronics Auto mate 552 Installation Manual

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door lock harness (H4) wire connection guide

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H4/A

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H4/B

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H4/C

This system can control two common power door lock types without any additional parts! With certain vehicles,

or if an actuator is to be installed, either a P/N 451M Door Lock Relay Satellite or two relays will be required.

IMPORTANT! If you mistake a Type C direct-wired system for a Type A positive-pulse system, the

module will be damaged!

type A: (+) 12V pulses from the switch to the factory relays

The system can control this type of system directly, with no additional parts. The switch will have three wires on

it, and one will test (+)12V constantly. The others will alternately pulse (+)12V when the switch is pressed to

the lock or unlock position.

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.

I If all doors unlock, the vehicle uses Type A system.

I If you lose all door lock operation in both directions, you are operating the master switch in a Type C system.

I 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. However, many more GM vehicles are Type C than in pre-

vious years. The full-size pickups (1989-up), many of the S10 Blazers, the Corvette, 1995 Cavalier/Sunfire 1993

and newer, Camaro/Firebird all use Type C door locks, and cannot be controlled without a 451M! Almost all

domestically-built Fords are Type C. Ford builds almost no Type A systems. Chrysler builds both Type A and Type

C, so care must be taken in determining the type of door locking system.

GREEN

EMPTY

BLUE

(-) LOCK, (+) UNLOCK OUTPUT

UNLESS USING 451M

(-) UNLOCK, (+) LOCK OUTPUT

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