Directed Electronics Ready Remote - Manual (Page 41)

37 © 2 0 0 6 D i r e c t e d E l e c t r o n i c s
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.
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 (+)12V in one direc-
tion and less than (+)12V 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 switch/key cylinder will read
less than (+)12V 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 constant (+)12V source.
Some good constant (+)12V references are the power input
source to the door lock switch/key cylinder, the ignition switch
note: Please refer to the Door Locking Systems document
on w
ww ww w..d deessiiggn ntteecch h--iin nttll..ccoom m (On-Line Tech Support,
Tech Tips) for complete resistor test procedure and addi-
tional information for multiplexed door locks.
note: To ensure an accurate resistance reading, do not
touch the resistor or leads during testing.