Directed Electronics Nissan - Manual (Page 31)

27 © 2 0 0 6 d i r e c t e d e l e c t r o n i c s
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.
SSIIN NG GL LE E--R RE ESSIISST TO OR R T TY YP PE E:: 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.
T TW WO O--R RE ESSIISST TO OR R T TY YP PE E:: 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.
D DE ET TE ER RM MIIN NIIN NG G T TH HE E P PR RO OP PE ER R R RE ESSIISST TO OR R V VA AL LU UE ESS:: 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 w
ww ww w..rreeaad dyyrreem moottee..ccoom m (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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