Jeep Cherokee (XJ): Description and operation
The power locks are controlled by a two-way switch
that is integral to the Driver Door Module (DDM)
and the Passenger Door Module (PDM) mounted in
the trim panel of its respective front door. Each
switch is illuminated by a light-emitting diode when
the ignition switch is turned to the On position. The
power lock switches provide a hard-wired lock or
unlock signal to the power lock system control circuitry,
which is located in the PDM.
The power lock switches and their lamps cannot be
repaired. If the switches are damaged or faulty, the
entire PDM or DDM unit must be replaced. A Driver Door Module (DDM) and a Passenger
Door Module (PDM) are used on all models equipped
with power locks and power windows. Each door
module houses both the front door power lock and
power window switches. In addition to the switches
for its own door, the DDM houses individual switches
for each passenger door power window, a power window
lockout switch and the power mirror switch. The
PDM contains the control circuitry and the power
lock and unlock relays for the entire power lock system.
In its role as the power lock control module, the
PDM receives inputs from the battery, the ignition
switch, the DDM, the driver door ajar switch, the
key-in ignition switch, and the headlamp switch. It
also receives a hard-wired input from the remote
Keyless Entry (RKE) receiver, if the vehicle is so
equipped. In response to these inputs, the PDM
sends the proper outputs to control the power lock
motors through its integral power lock and unlock
relays.
The DDM and the PDM are mounted to their
respective front door trim panels. The DDM and
PDM are serviced individually and cannot be
repaired. If the DDM or PDM, or any of the switches
and circuitry that they contain are faulty or damaged,
the complete DDM or PDM unit must be
replaced. In the power lock and Remote Keyless Entry
(RKE) systems, the locks are actuated by a reversible
electric motor mounted within each door and the liftgate.
The power lock motor direction is controlled by
the battery and ground feeds from the power lock
and unlock relays integral to the Passenger Door
Module (PDM).
The power lock motors cannot be repaired and, if
faulty or damaged, the entire motor must be
replaced. The Remote Keyless Entry (RKE) system transmitter
is equipped with two buttons, labeled Lock and
Unlock. It is also equipped with a key ring and is
designed to serve as a key fob. The operating range
of the transmitter radio signal is up to 7 meters (23
feet) from the RKE receiver.
Each transmitter has a different vehicle access
code, which must be programmed into the memory of
the RKE receiver in the vehicle in order to operate
the RKE system. See Remote Keyless Entry Transmitter
Programming in this group for more information.
The transmitter operates on two Panasonic
CR2016 (or equivalent) batteries. Typical battery life
is from one to two years. The transmitter cannot be
repaired and, if faulty or damaged, it must be
replaced. On models with the Remote Keyless Entry (RKE)
option, an RKE receiver is mounted in an RKE housing,
or in the overhead console housing on the vehicle 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 Collision
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 feature
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 transmitter.
See Remote Keyless Entry Receiver Programming
in this group for more information on this
feature.
The RKE receiver cannot be repaired and, if faulty
or damaged, it must be replaced.Power lock switch
Door module
Power lock motor
Remote keyless entry transmitter
Remote keyless entry receiver
Other materials:
Starter motor noise - 2.5L engine. Starter motor. Starter relay
Starter motor noise - 2.5L engine
See the Starter Motor Noise Diagnosis chart (Fig.
9). If the complaint is similar to Conditions 1 and 2
in the chart, correction can be made by placing shims
between the starter motor and the engine block using
the following procedures:
CONDITION
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