©
2006
Directed Electronics
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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.
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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 constant (+)12V source. Some good constant (+)12V references are the power input
source to the door lock switch/key cylinder, the ignition switch power wire, or the (+) terminal
of the battery.
3. Operate the door lock switch/key cylinder in both directions to determine the resistor values.
If the multimeter 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.
