1
18
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© 2005 Directed Electronics, Vista, CA—all rights reserved
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
GLLEE--R
REESSIISSTTO
OR
R TTY
YP
PEE:: If one resistor is used in the door lock switch/key cylinder, the wire will pulse ground in
one direction and resistance to ground when operated in the opposite direction.
TTW
WO
O--R
REESSIISSTTO
OR
R TTY
YP
PEE:: 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
DEETTEER
RM
MIIN
NIIN
NG
G TTH
HEE P
PR
RO
OP
PEER
R R
REESSIISSTTO
OR
R V
VA
ALLU
UEESS:: 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.
IIM
MP
PO
OR
RTTA
AN
NTT:: 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 ground
source. Some good ground references are the ground input source to the door lock switch/key cylinder or the
battery ground.
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 direction, no resistor is needed for that direction.
4. Once the resistor value(s) is determined, refer to the wiring diagram for proper wiring.
H2/A
H2/B
H2/C
H2/D
H2/E
H2/F
H2/G
ON-BOARD
LOCK
RELAY
ON-BOARD
UNLOCK
RELAY
#87
#87A
#30
#87
#87A
#30
TO CHASSIS
GROUND
BCM
15A
BLACK/WHITE DOMELIGHT SUPERVISION RELAY NORMALLY OPEN
GREEN/BLACK LOCK #30 COMMON (OUTPUT)
WHITE/BLACK NOT USED
VIOLET/BLACK LOCK #87 NORMALLY OPEN (INPUT)
BROWN/BLACK NOT USED
BLUE/BLACK UNLOCK #30 COMMON (OUTPUT)
VIOLET UNLOCK #87 NORMALLY OPEN (INPUT)
VIOLET & VIOLET/BLACK ARE COMMON AT FUSE HOLDER
LOCK RESISTOR
(IF REQUIRED)
UNLOCK RESISTOR
(IF REQUIRED)
DOOR LOCK SWITCH/
KEY CYLINDER
UNLOCK
CHASSIS
GROUND
LOCK
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