Dodge 2000 DURANGO Service Manual page 461

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DIAGNOSIS AND TESTING
POWER LOCK SYSTEM AND REMOTE
KEYLESS ENTRY SYSTEM
As a preliminary diagnosis for vehicles with the
power lock and Remote Keyless Entry (RKE) systems
(high-line version of the Central Timer Module), note
the system operation while you actuate both the Lock
and Unlock functions with the power lock switches
and the RKE transmitter. Then, proceed as follows:
• If the driver side front door power lock motor
fails to unlock following a single press of the RKE
transmitter Unlock button, test the driver unlock
relay. See Relays in the Diagnosis and Testing sec-
tion of this group for the procedures.
• If the entire power lock system fails to function
with either the power lock switches or the RKE
transmitter, check the fuses in the junction block.
• If the power lock system functions with both
power lock switches, but not with the RKE transmit-
ter, see Remote Keyless Entry Transmitter in the
Diagnosis and Testing section of this group.
• If the entire power lock system functions with
the RKE transmitter, but not with one or both of the
power lock switches, see Power Lock Switch in the
Diagnosis and Testing section of this group.
• If one power lock motor fails to operate with
both of the power lock switches and/or the RKE
transmitter, see Power Lock Motor in the Diagnosis
and Testing section of this group.
If the problem being diagnosed involves only the
RKE horn chirp or panic mode features, test the horn
relay and/or headlamp relay. See Relays in the Diag-
nosis and Testing section of this group for the proce-
dures. If both of these relays check OK, further
diagnosis should be performed using a DRB scan tool
as described in the proper Diagnostic Procedures
manual.
POWER LOCK SWITCH
If the problem being diagnosed involves only the
power lock switch illumination LEDs, check the fused
ignition switch output (run) and ground circuits at
the power lock switch connector. For circuit descrip-
tions and diagrams, refer to 8W-61 - Power Door
Locks in Group 8W - Wiring Diagrams.
POWER LOCK SYSTEMS
(1) Check the fuse in the junction block. If OK, go
to Step 2. If not OK, repair the shorted circuit or
component as required and replace the faulty fuse.
(2) Check for battery voltage at the fuse in the
junction block. If OK, go to Step 3. If not OK, repair
the open circuit to the Power Distribution Center
(PDC) as required.
(3) Disconnect and isolate the battery negative
cable. Unplug the wire harness connector from the
power lock switch.
(4) Connect the battery negative cable. Check for
battery voltage at the fused B(+) circuit cavity of the
body half of the power lock switch wire harness con-
nector. If OK, go to Step 5. If not OK, repair the open
circuit to the junction block as required.
(5) Test the power lock switch continuity. See the
Power Lock Switch Continuity charts to determine if
the continuity is correct in the Off, Lock and Unlock
switch positions (Fig. 1) or (Fig. 2). If OK, repair the
door lock switch output (lock and/or unlock) circuit(s)
from the body half of the power lock switch wire har-
ness connector to the Central Timer Module (CTM)
as required. If not OK, replace the faulty switch.
DRIVER SIDE LOCK SWITCH
SWITCH POSITION
OFF
LOCK
UNLOCK
LAMP (LED)
Fig. 1 Power Lock Switch Continuity - Driver Side
8P - 5
CONTINUITY
BETWEEN
4 & 5 (LED)
1 & 9
9 & 10
4 & 5