At The Switch; Type A Door Locks: Positive-Triggered, Relay Driven System; Type B Door Locks: Negative-Triggered, Relay Driven System - Avital 2000 Operation Manual

at the switch

I Three-wire switches will have either a constant ground input or a constant (+)12V input, along with the
pulsed lock and unlock outputs to the factory relays.
I Many BMW's and VW's have no external switch. The switches are inside the actuator, and instead of pulsing,
the proper wires will flip-flop from (+)12V to (-) ground as the door locks are operated.
I Direct-wired switches will have a (+)12V constant input and one or two (-) ground inputs, along with two
output leads going directly to the lock motors.
type A: positive-triggered, relay-driven system
type B: negative-triggered, relay-driven system
This system is common in many Toyota, Nissan, Honda, and Saturn models, as well as Fords with the keyless-
entry system (some other Fords also use Type B).
The switch will have three wires on it, and one wire will test ground all the time. One wire will pulse (-) when
the switch locks the doors, and the other wire will pulse (-) when the switch unlocks the doors. This type of
system is difficult to mistake for any other type.
© 2001 Directed Electronics, Inc. Vista, CA
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