Dodge 2000 DURANGO Service Manual page 463

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DIAGNOSIS AND TESTING (Continued)
with the power lock switch, see Remote Keyless
Entry Transmitter in the Diagnosis and Testing sec-
tion of this group. If not OK, with the power lock
switch or the RKE transmitter, replace the faulty
CTM.
(10) Back-probe the door unlock driver circuit cav-
ity of the 18-way CTM wire harness connector and
check for battery voltage as the power lock switch is
moved to the Unlock position. Repeat the test press-
ing the Unlock button of the RKE transmitter twice
within five seconds. If OK, see Power Lock Motor in
the Diagnosis and Testing section of this group. If not
OK using the power lock switch, but OK with the
RKE transmitter, see Power Lock Switch in the Diag-
nosis and Testing section of this group. If not OK
using the RKE transmitter, but OK with the power
lock switch, see Remote Keyless Entry Transmitter
in the Diagnosis and Testing section of this group. If
not OK, with the power lock switch or the RKE
transmitter, replace the faulty CTM.
POWER LOCK MOTOR
Before you proceed with this diagnosis, confirm
proper power lock switch, Central Timer Module
(CTM) and power lock switch output circuit opera-
tion. See Power Lock Switch and Central Timer Mod-
ule in the Diagnosis and Testing section of this
group. Remember, the CTM circuitry controls the
output to each of the power lock motors. For circuit
descriptions and diagrams, refer to 8W-61 - Power
Door Locks in Group 8W - Wiring Diagrams.
(1) Check each power lock motor for correct opera-
tion while moving the power lock switch to both the
Lock and Unlock positions. If all of the power lock
motors are inoperative, go to Step 2. If one power
lock motor is inoperative, go to Step 3.
(2) If all of the power lock motors are inoperative,
the problem may be caused by one shorted motor.
Unplugging a shorted power lock motor from the
power lock circuit will allow the good power lock
motor to operate. Unplug each power lock motor wire
harness connector, one at a time, and recheck both
the lock and unlock functions by operating the power
lock switch. If all of the power lock motors are still
inoperative after the above test, check for a short or
open circuit between the power lock motors and the
CTM. If unplugging one power lock motor causes the
other motor to become functional, go to Step 3 to test
the unplugged motor.
(3) Once it is determined which power lock motor
is inoperative, that motor can be tested as follows.
Unplug the wire harness connector at the inoperative
power lock motor. Apply 12 volts to the motor termi-
nals to check its operation in one direction. Reverse
the polarity to check the operation in the other direc-
tion. If OK, repair the short or open circuits between
POWER LOCK SYSTEMS
the power lock motor and the CTM as required. If
not OK, replace the faulty power lock motor.
REMOTE KEYLESS ENTRY TRANSMITTER
(1) Replace the Remote Keyless Entry (RKE)
transmitter batteries. See Remote Keyless Entry
Transmitter Battery Replacement in the Service Pro-
cedures section of this group. Test each of the trans-
mitter functions. If OK, discard the faulty batteries.
If not OK, go to Step 2.
(2) Program the suspect RKE transmitter and
another known good transmitter into the RKE mod-
ule. Use a DRB scan tool, as described in the proper
Diagnostic Procedures manual. See Remote Keyless
Entry Transmitter Programming in the Service Pro-
cedures section of this group.
(3) Test the RKE system operation with both
transmitters. If both transmitters fail to operate the
power lock system, use a DRB scan tool and the
proper Diagnostic Procedures manual for further
diagnosis of the RKE system. If the known good
transmitter operates the power locks and the suspect
transmitter does not, replace the faulty transmitter.
NOTE: Be certain to perform the Remote Keyless
Entry Transmitter Programming procedure again
following this test. This procedure will erase the
access code of the test transmitter from the RKE
receiver.
RELAYS
The headlamp (or security) relay is located in the
Power Distribution Center (PDC) in the engine com-
partment. The horn relay is located in the Junction
Block (JB), on the left end of the instrument panel in
the passenger compartment. The driver unlock relay
is located in the relay and fuse block on the back of
the JB underneath the left end of the instrument
panel in the passenger compartment. Each of these
relays can be tested as described in the following pro-
cedure, however the circuits they are used in do vary.
To test the relay circuits, refer to the circuit descrip-
tions and diagrams in 8W-39 - Vehicle Theft Security
System and 8W-61 - Power Locks in Group 8W - Wir-
ing Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL,
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
GROUP 8M - PASSIVE
STEERING COLUMN,
8P - 7
OR