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© 2003 directed electronics, inc.
type G: positive (+) multiplex
This 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.
SSIINNGGLLEE--RREESSIISSTTOORR TTYYPPEE::
If one resistor is used in the door
lock switch/key cylinder, the wire will pulse (+)12V in one direc-
tion and less than (+)12V when operated in the opposite direc-
tion.
TTWWOO--RREESSIISSTTOORR TTYYPPEE::
If two resistors are used in the factory
door lock switch/key cylinder, the switch/key cylinder will read
less than (+)12V in both directions.
DDEETTEERRMMIINNIINNGG TTHHEE PPRROOPPEERR RREESSIISSTTOORR VVAALLUUEESS::
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.
IMPORTANT: 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.