Jeep Cherokee 2000 Service Manual - page 523
headliner. The RKE receiver is a radio frequency unit
that also contains the RKE system program logic.
The RKE receiver also performs as a smart relay for
the illuminated entry feature.
The RKE receiver has a memory function to retain
the vehicle access codes of at least one, but no more
than four RKE transmitters. The receiver is designed
to retain the transmitter codes in memory, even if
the battery is disconnected.
The RKE receiver receives inputs from the battery,
the driver door ajar switch, and the Chrysler Colli-
sion Detection (CCD) data bus. It also receives the
radio signal input from the RKE transmitter. In
response to those inputs, it is programmed to control
outputs to the power lock motors, the courtesy lamp
circuits, and the vehicle horn.
The RKE system for this vehicle also features a
customer programmable horn chirp feature. This fea-
ture allows the customer the option of enabling or
disabling the horn chirp request that the RKE
receiver issues as an audible indication that a valid
Lock signal has been received from the RKE trans-
mitter. See Remote Keyless Entry Receiver Program-
ming in this group for more information on this
feature.
The RKE receiver cannot be repaired and, if faulty
or damaged, it must be replaced.
DIAGNOSIS AND TESTING
POWER LOCK SYSTEM AND REMOTE
KEYLESS ENTRY SYSTEM
On models without the Remote Keyless Entry
(RKE) option, proceed directly to the Door Module
diagnosis. As a preliminary diagnosis for models with
the RKE system, note the power lock system and
illuminated entry system operation while you actuate
both the Lock and Unlock functions with the power
lock switches and the RKE transmitter. Then, pro-
ceed as follows:
•
If the entire power lock system fails to function
with either the power lock switches or the RKE
transmitter, unplug the wire harness connector from
the RKE receiver and test the power lock system
operation again using the power lock switches. If the
power lock system now operates, see the Remote
Keyless Entry Receiver diagnosis in this group. If the
power lock system still fails to operate, see the Door
Module diagnosis in this group.
•
If the power lock system functions with both
power lock switches, but not with the RKE transmit-
ter, see the Remote Keyless Entry Transmitter diag-
nosis in this group.
•
If one power lock motor fails to operate with
both of the power lock switches and/or the RKE
transmitter, see the Power Lock Motor diagnosis in
this group.
•
If the RKE and power lock systems are function-
ing, but the illuminated entry system fails to operate,
see the Remote Keyless Entry Receiver diagnosis in
this group.
DOOR MODULE
If the power lock system is inoperative with either
front door power lock switch, test the Passenger Door
Module (PDM). If the power lock system is inopera-
tive with only the driver side front door power lock
switch, test the Driver Door Module (DDM). For cir-
cuit descriptions and diagrams, refer to 8W-61 -
Power Door Locks in Group 8W - Wiring Diagrams.
DRIVER DOOR MODULE
The only function of the Driver Door Module
(DDM) in the power lock system is to provide a Lock
or Unlock signal to the power lock system control cir-
cuitry contained within the Passenger Door Module
(PDM). The DDM signals the PDM by providing a
hard-wired ground path through the DDM ground
circuit and the driver side power lock switch contacts
to the lock request or unlock request terminals of the
PDM. The DDM power lock switch function can be
tested as follows:
(1) Disconnect and isolate the battery negative
cable. Remove the driver side front door trim panel
and unplug the 12-way DDM wire harness connector
(C-2) from the DDM. Check for continuity between
the ground circuit cavity of the 12-way DDM wire
harness connector and a good ground. There should
be continuity. If OK, go to Step 2. If not OK, repair
the open circuit to ground as required.
(2) If the problem being diagnosed is inoperative
power lock switch illumination, proceed as follows. If
the problem is not power lock switch illumination, go
to Step 4. Connect the battery negative cable. Turn
the ignition switch to the Accessory or On positions.
Check for battery voltage at both sides of the power
window circuit breaker in the junction block. If OK,
go to Step 3. If not OK, replace the faulty circuit
breaker.
(3) With the ignition switch still in the On or
Accessory position, check for battery voltage at the
fused ignition switch output circuit cavity of the
12-way DDM wire harness connector. If OK, replace
the faulty DDM. If not OK, repair the open circuit to
the junction block as required.
(4) Test the power lock switch continuity through
the DDM 12-way wire harness connector receptacle.
See the DDM Power Lock Switch Continuity chart
(Fig. 1) to determine if the continuity is correct in
both the Lock and Unlock switch positions. If OK,
repair the lock request circuit and/or the unlock
XJ
POWER LOCK SYSTEMS
8P - 3
DESCRIPTION AND OPERATION (Continued)