Power Lock Switch Description And Operation; Door Module Description And Operation; Power Lock Motor Description And Operation; Remote Keyless Entry Transmitter, Remote Keyless Entry Receiver - Jeep Cherokee 2000 Service Manual

8P - 2 POWER LOCK SYSTEMS
GENERAL INFORMATION (Continued)
(about thirty seconds), when the power locks are
unlocked using the RKE transmitter.
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 system can retain the vehicle access
codes of up to four transmitters. The transmitter
codes are retained in memory, even if the battery is
disconnected. If a transmitter is faulty or lost, new
transmitter vehicle access codes can be programmed
into the system using a DRB scan tool and the
proper Diagnostic Procedures manual.
The RKE system consists of the remote key fob
transmitter and a radio receiver with program logic.
The RKE receiver is installed in an RKE housing on
the headliner of the vehicle, or in the housing of the
optional overhead console, depending upon how the
vehicle is equipped.
Following are general descriptions of the major
components in the RKE system. Refer to the owner's
manual in the vehicle glove box for more information
on the features, use and operation of the RKE sys-
tem.
DESCRIPTION AND OPERATION
POWER LOCK SWITCH
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 cir-
cuitry, 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.
DOOR MODULE
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 win-
dow 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 sys-
tem.
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 dam-
aged, the complete DDM or PDM unit must be
replaced.
POWER LOCK MOTOR
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 lift-
gate. 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.
REMOTE KEYLESS ENTRY TRANSMITTER
The Remote Keyless Entry (RKE) system transmit-
ter 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 Trans-
mitter Programming in this group for more informa-
tion.
The transmitter operates
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.
REMOTE KEYLESS ENTRY RECEIVER
On models with the Remote Keyless Entry (RKE)
option, an RKE receiver is mounted in an RKE hous-
ing, or in the overhead console housing on the vehicle
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