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Type A: Three-wire (+) pulse controlling factory lock relays
The system can control Type A door locks directly, with no additional parts. The
switch will have three wires on it; one will test (+)12 volt constantly. The others
will alternately pulse (+)12 volt 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 (+)12
volt alternately on lock and unlock, make sure that it is not a Type C direct-wire
system.
Here is a test: Cut the wire that pulses (+)12V on lock, and then operate the
switch. If the lock stops working, then you have the correct wire.
Important: Remember that these wires' functions reverse between Type A and
type B.
GREEN
BLUE
Type B: Three-wire (-) pulse controlling factory lock relays
3
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