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t t y y p p e e H H : : n n e e g g a a t t i i v v e e ( ( - - ) ) m m u u l l t t i i p p l l e e x x
The system is most commonly found in Ford, Mazda, Chrysler and GM vehicles. The door lock switch or door key
cylinder may contain either one or two resistors.
S S I I N N G G L L E E - - R R E E S S I I S S T T O O R R T T Y Y P P E E : : If one resistor is used in the door lock switch/key cylinder, the wire will pulse ground in
one direction and resistance to ground when operated in the opposite direction.
T T W W O O - - R R E E S S I I S S T T O O R R T T Y Y P P E E : : If two resistors are used in the factory door lock switch/key cylinder, the door lock
switch/key cylinder will read resistance to ground in both directions.
D D E E T T E E R R M M I I N N I I N N G G T T H H E E P P R R O O P P E E R R R R E E S S I I S S T T O O R R V V A A L L U U E E S S : : To determine the resistor values, the door lock switch/key cylinder
must be isolated from the factory door lock system. For testing, use a calibrated digital multimeter that is set to ohms.
I I M M P P O O R R T T A A N N T T : : To ensure an accurate resistance reading, do not touch the resistor or leads during
testing.
1. Cut the output wire from the door lock switch/key cylinder in half.
2. Test with the meter from the switch side of the cut door lock switch/key cylinder wire to a reliable ground
source. Some good ground references are the ground input source to the door lock switch/key cylinder or the
battery ground.
3. Operate the door lock switch/key cylinder in both directions to determine the resistor values. If the multi-
meter displays zero resistance in one direction, no resistor is needed for that direction.
4. Once the resistor value(s) is determined, refer to the wiring diagram for proper wiring.
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© 2004 Directed Electronics, Inc. Vista, CA
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