Dodge 2000 DURANGO Service Manual page 460

8P - 4 POWER LOCK SYSTEMS
DESCRIPTION AND OPERATION (Continued)
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 the Service Procedures sec-
tion this group for more information.
The transmitter operates on two Duracell DL2016,
Panasonic CR2016 (or equivalent) batteries. Typical
battery life is from one to two years. The RKE trans-
mitter cannot be repaired and, if faulty or damaged,
it must be replaced.
REMOTE KEYLESS ENTRY RECEIVER
The Remote Keyless Entry (RKE) receiver is a
radio frequency unit that is integral to the high-line
version of the Central Timer Module (CTM). The
CTM also contains the program logic and control cir-
cuitry for the RKE system. The CTM is mounted
under the passenger side end of the instrument
panel, outboard of the instrument panel glove box
opening.
The RKE receiver has a memory function to retain
the vehicle access codes of up to four RKE transmit-
ters. The receiver is designed to retain the transmit-
ter codes in memory, even if the battery is
disconnected.
The RKE receiver is energized by one of three
radio frequency inputs from the RKE transmitter;
Unlock, Lock, or Panic. The programming of the
CTM responds to these RKE inputs, as well as many
other inputs, by sending the proper control outputs
to the power lock motors, the courtesy lamp circuit,
the driver unlock relay, the horn relay, and the head-
lamp relay.
For diagnosis or programming of the RKE receiver
within the high-line CTM, a DRB scan tool and the
proper Diagnostic Procedures manual are recom-
mended. The RKE receiver is only serviced as a unit
with the high-line CTM and, if faulty or damaged,
the CTM unit must be replaced.
DRIVER UNLOCK RELAY
The driver unlock relay is a International Stan-
dards Organization (ISO) micro-relay. The terminal
designations and functions are the same as a conven-
tional ISO relay. However, the micro-relay terminal
orientation (or footprint) is different, current capacity
is lower, and the relay case dimensions are smaller
than those of the conventional ISO relay.
The driver unlock relay is a electromechanical
device that switches battery current to the left front
door power lock motor when the Remote Keyless
Entry (RKE) receiver within the high-line Central
Timer Module (CTM) grounds the relay coil. See
Driver Unlock Relay in the Diagnosis and Testing
section of this group for more information.
The driver unlock relay is located in the relay and
fuse block attached to the back of the junction block,
under the left side of the instrument panel in the
passenger compartment. The driver unlock relay can-
not be repaired and, if faulty or damaged, it must be
replaced.
HEADLAMP RELAY
The headlamp (or security) relay is a International
Standards Organization (ISO) micro-relay. The termi-
nal designations and functions are the same as a con-
ventional ISO relay.
terminal orientation (or footprint) is different, cur-
rent capacity is lower, and the relay case dimensions
are smaller than those of the conventional ISO relay.
The headlamp relay is a electromechanical device
that switches battery current to the headlamps when
the high-line Central Timer Module (CTM) grounds
the relay coil. See Headlamp Relay in the Diagnosis
and Testing section of this group for more informa-
tion.
The headlamp relay is located in the Power Distri-
bution Center (PDC), behind the battery on the left
side of the engine compartment.
The headlamp relay cannot be repaired and, if
faulty or damaged, it must be replaced.
HORN RELAY
The horn relay is a International Standards Orga-
nization (ISO) micro-relay. The terminal designations
and functions are the same as a conventional ISO
relay. However, the micro-relay terminal orientation
(or footprint) is different, current capacity is lower,
and the relay case dimensions are smaller than those
of the conventional ISO relay.
The horn relay is a electromechanical device that
switches battery current to the horn when the horn
switch or the high-line Central Timer Module (CTM)
grounds the relay coil. Refer to Relays in the Diag-
nosis and Testing section of this group for more infor-
mation.
The horn relay is located in the Junction Block
(JB), on the left end of the instrument panel in the
passenger compartment. See the fuse and relay lay-
out label on the inside of the fuse access panel for
relay identification and location.
If a problem is encountered with a continuously
sounding horn, it can usually be quickly resolved by
removing the horn relay from the JB until further
diagnosis is completed.
The horn relay cannot be repaired and, if faulty or
damaged, it must be replaced.
However, the micro-relay
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