Jeep Cherokee 2000 Service Manual - page 525
(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
PDM. If unplugging one power lock motor causes the
other motors 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
the power lock motor and the PDM 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 this group for
the procedures. Test each of the transmitter func-
tions. If OK, discard the faulty batteries. If not OK,
go to Step 2.
(2) Perform the Remote Keyless Entry Transmitter
Programming procedure with the suspect transmitter
and another known good transmitter. Use a DRB
scan tool, as described in the proper Diagnostic Pro-
cedures manual.
(3) Test the RKE system operation with both
transmitters. If both transmitters fail to operate the
power lock system, see the diagnosis for the Remote
Keyless Entry Receiver in this group. 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.
REMOTE KEYLESS ENTRY RECEIVER
If the problem being diagnosed is an inoperative
Remote Keyless Entry (RKE) horn chirp feature, be
certain that the horn chirp feature has not been dis-
abled. See Remote Keyless Entry Receiver Program-
ming in this group for the procedures. Also be certain
that the vehicle horn system is operational. Refer to
Group 8G - Horn Systems for more information.
If the problem being diagnosed is an inoperative
RKE illuminated entry system, be certain that the
interior courtesy lamp system is operational. Refer to
Group 8L - Lamps for more information.
Before you proceed with diagnosis of the RKE
receiver, see the diagnosis for Remote Keyless Entry
Transmitter in this group. For circuit descriptions
and diagrams, refer to 8W-61 - Power Door Locks in
Group 8W - Wiring Diagrams.
(1) Check the fuses in the Power Distribution Cen-
ter (PDC) and the junction block. If OK, go to Step 2.
LEFT-HAND DRIVE (LHD)
SWITCH POSITION
CONTINUITY BETWEEN
LOCK
C1 PIN 3 & C1 PIN 6
C1 PIN 3 & C2 PIN 1
C1 PIN 3 & C2 PIN 5
UNLOCK
C1 PIN 6 & C1 PIN 7
C1 PIN 7 & C2 PIN 1
C1 PIN 7 & C2 PIN 5
RIGHT-HAND DRIVE (RHD)
SWITCH POSITION
CONTINUITY BETWEEN
LOCK
C1 PIN 7& C1 PIN 6
C1 PIN 7 & C2 PIN 1
C1 PIN 7 & C2 PIN 5
UNLOCK
C1 PIN 6 & C1 PIN 3
C1 PIN 3 & C2 PIN 1
C1 PIN 3 & C2 PIN 5
Fig. 2 PDM Power Lock Switch Continuity
XJ
POWER LOCK SYSTEMS
8P - 5
DIAGNOSIS AND TESTING (Continued)