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type H: negative (-) multiplex
single-resistor type
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.
two-resistor type
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.
determining the proper resistor values
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 battery ground.
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 diagram for proper wiring.
34
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