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Determining the Proper Resistor Values
To determine the resistor values, the door lock switch/key cylinder must be iso-
lated from the factory door lock system. For all testing, use a calibrated digital
multi meter that is set to ohms.
1.
Cut the output wire from the door switch/key cylinder in half.
2.
Test with one meter probe on the switch side of the cut wire, if testing for
a positive circuit place the other probe to a constant (+)12V source. Good
constant (+) 12V references include the power input source to the door lock
switch/key cylinder, the ignition switch power wire, or the battery (+) terminal.
When testing for a negative, place one meter probe on the switch side of
the cut wire and the other probe to a good chassis ground. Good references
would include the ground input source to the door locks switch/key cylin-
der or on bare metal in the kick panel or the battery (-) terminal.
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 direc-
tion, no resistor is needed for that direction.
4.
Once the resistor value(s) is determined, refer to the Type G or H wiring
diagram for proper wiring.
© 2008 Directed Electronics—all rights reserved
12V
CONSTANT
CAR FUSE PANEL
or
BCM
43
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