Radio Shack RS-4000 - Manual (Page 7)

Need Help? Call 1-800-598-2527 7
INSTALLATION
DETERMINING YOUR
VEHICLE’S POWER
DOOR LOCK TYPE
There are three basic types of power
door locks:
Type A: Requires a positive pulse on
the lock/unlock control wires to lock
or unlock the door.
Type B: Requires a ground pulse on
the lock/unlock control wires to lock
or unlock the door.
Type C: Requires a ground pulse on
one control wire and a simultaneous
positive pulse on another control wire
to lock or unlock the door.
Follow these steps to determine your
vehicle’s power door lock type.
1. Use your vehicle’s service man-
ual, contact your vehicle manu-
facturer, or contact the Auto
Alarm Helpline at 1-800-598-
2527 to determine where to find
the power door lock control wires.
They are usually behind a panel
near or on the door.
2. Perform each of the following
sections, in order, until you suc-
cessfully identify the switch type
(first determine if the switch is a
Type C — if it is not Type C,
check for Type A — if it is not a
Type A, check for Type B).
Note: To probe an insulated wire,
put wire-piercing probe adapters
on your meter or test light leads.
Type C Switch Test
Probe both wires. Then operate
the door locks. If the light turns on
or the meter indicates 12 volts
while you operate the switch, the
switch is a Type C switch. Call 1-
800-598-2527 for additional
installation information, then pro-
ceed to Step 3.
Type A Switch Test
If the light did not turn on or the
meter did not indicate 12 volts,
touch one lead from the 12-volt
test light or volt meter to one of
the control wires and touch the
other lead to a metal vehicle
chassis part. Operate your power
door locks.
If the light turns on or the volt
meter indicates 12 volts when
you move the door lock switch to
the LOCK position, you have
located a Type A Lock control
wire. Test the other wire.
If the light turns on or the volt
meter indicates 12 volts when
you move the door lock switch to
the UNLOCK position, you have
located a Type A Unlock control
wire. Test the other wire (if you
have not already done so).
If both wires are Type A control
wires, go to Step 3.
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