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© 2006 directed electronics
type H: negative (-) multiplex
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.
SSIINNGGLLEE--RREESSIISSTTOORR TTYYPPEE::
If one resistor is used in the door
lock switch/key cylinder, the wire will pulse ground in one direc-
tion and resistance to ground when operated in the opposite
direction.
TTWWOO--RREESSIISSTTOORR TTYYPPEE::
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.
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.
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
note: Please refer to the Door Locking Systems document
on
wwwwww..rreeaaddyyrreemmoottee..ccoomm
(On-Line Tech Support, Tech
Tips) for complete resistor test procedure and additional
information for multiplexed door locks.
note: To ensure an accurate resistance reading, do not
touch the resistor or leads during testing.
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