Dodge Durango (DN). Manual — part 314

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.

However,

the

micro-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.

8P - 4

POWER LOCK SYSTEMS

DN

DESCRIPTION AND OPERATION (Continued)

DIAGNOSIS AND TESTING

POWER LOCK SYSTEM AND REMOTE
KEYLESS ENTRY SYSTEM

As a preliminary diagnosis for vehicles with the

power lock and Remote Keyless Entry (RKE) systems
(high-line version of the Central Timer Module), note
the system operation while you actuate both the Lock
and Unlock functions with the power lock switches
and the RKE transmitter. Then, proceed as follows:

• If the driver side front door power lock motor

fails to unlock following a single press of the RKE
transmitter Unlock button, test the driver unlock
relay. See Relays in the Diagnosis and Testing sec-
tion of this group for the procedures.

• If the entire power lock system fails to function

with either the power lock switches or the RKE
transmitter, check the fuses in the junction block.

• If the power lock system functions with both

power lock switches, but not with the RKE transmit-
ter, see Remote Keyless Entry Transmitter in the
Diagnosis and Testing section of this group.

• If the entire power lock system functions with

the RKE transmitter, but not with one or both of the
power lock switches, see Power Lock Switch in the
Diagnosis and Testing section of this group.

• If one power lock motor fails to operate with

both of the power lock switches and/or the RKE
transmitter, see Power Lock Motor in the Diagnosis
and Testing section of this group.

If the problem being diagnosed involves only the

RKE horn chirp or panic mode features, test the horn
relay and/or headlamp relay. See Relays in the Diag-
nosis and Testing section of this group for the proce-
dures. If both of these relays check OK, further
diagnosis should be performed using a DRB scan tool
as described in the proper Diagnostic Procedures
manual.

POWER LOCK SWITCH

If the problem being diagnosed involves only the

power lock switch illumination LEDs, check the fused
ignition switch output (run) and ground circuits at
the power lock switch connector. For circuit descrip-
tions and diagrams, refer to 8W-61 - Power Door
Locks in Group 8W - Wiring Diagrams.

(1) Check the fuse in the junction block. If OK, go

to Step 2. If not OK, repair the shorted circuit or
component as required and replace the faulty fuse.

(2) Check for battery voltage at the fuse in the

junction block. If OK, go to Step 3. If not OK, repair
the open circuit to the Power Distribution Center
(PDC) as required.

(3) Disconnect and isolate the battery negative

cable. Unplug the wire harness connector from the
power lock switch.

(4) Connect the battery negative cable. Check for

battery voltage at the fused B(+) circuit cavity of the
body half of the power lock switch wire harness con-
nector. If OK, go to Step 5. If not OK, repair the open
circuit to the junction block as required.

(5) Test the power lock switch continuity. See the

Power Lock Switch Continuity charts to determine if
the continuity is correct in the Off, Lock and Unlock
switch positions (Fig. 1) or (Fig. 2). If OK, repair the
door lock switch output (lock and/or unlock) circuit(s)
from the body half of the power lock switch wire har-
ness connector to the Central Timer Module (CTM)
as required. If not OK, replace the faulty switch.

Fig. 1 Power Lock Switch Continuity - Driver Side

DRIVER SIDE LOCK SWITCH

SWITCH POSITION

CONTINUITY

BETWEEN

OFF

4 & 5 (LED)

LOCK

1 & 9

UNLOCK

9 & 10

LAMP (LED)

4 & 5

DN

POWER LOCK SYSTEMS

8P - 5

CENTRAL TIMER MODULE

NOTE: The following tests may not prove conclu-
sive in the diagnosis of the high-line version of the
Central Timer Module (CTM). The most reliable, effi-
cient, and accurate means to diagnose the high-line
CTM requires the use of a DRBIII

T

scan tool and the

proper Diagnostic Procedures manual.

If the problem being diagnosed involves only the

RKE horn chirp feature, see Relays in the Diagnosis
and Testing section of this group to test the horn
relay before testing the CTM. If the relay checks OK;
or if the problem being diagnosed involves the rolling
door locks, door lock inhibit, central locking or
enhanced accident response features, further diagno-
sis of the CTM should be performed using a DRBIII

t

scan tool as described in the proper Diagnostic Pro-
cedures manual. If the problem being diagnosed
involves only the RKE driver unlock feature, be cer-
tain that the feature is enabled using a DRBIII

t scan

tool and the proper Diagnostic Procedures manual.
Also, if the problem being diagnosed involves only
the driver side front door, see Relays in the Diagnosis
and Testing section of this group to test the driver
unlock relay before testing the CTM. For circuit
descriptions and diagrams, refer to 8W-61 - Power
Door Locks in Group 8W - Wiring Diagrams.

(1) Check the fuses in the junction block. If OK, go

to Step 2. If not OK, repair the shorted circuit or
component as required and replace the faulty fuse.

(2) Check for battery voltage at the fuse in the

junction block. If OK, go to Step 3. If not OK, repair
the open circuit to the Power Distribution Center
(PDC) as required.

(3) Disconnect and isolate the battery negative

cable. Remove the Central Timer Module (CTM) from
its mounting bracket to access the CTM wire harness
connectors. Refer to Central Timer Module in the
Removal and Installation section of Group 8E -
Instrument Panel Systems for the procedures.

(4) Unplug the wire harness connectors from the

CTM. Check the wire harness connectors and the
receptacles in the CTM for loose, corroded, or dam-
aged terminals and pins. If OK, go to Step 5. If not
OK, repair as required.

(5) Probe the ground circuit cavity of the 14-way

CTM wire harness connector and check for continuity
to a good ground. Repeat the check between the
ground circuit cavity of the 18-way CTM wire har-
ness connector and a good ground. In each case,
there should be continuity. If OK, go to Step 6. If not
OK, repair the open circuit(s) to ground as required.

(6) Connect the battery negative cable. Check for

battery voltage at the fused B(+) circuit cavity of the
14-way CTM wire harness connector. If OK, go to
Step 7. If not OK, repair the open circuit to the junc-
tion block as required.

(7) Probe the door lock switch output (lock) circuit

cavity of the 18-way CTM wire harness connector
and check for battery voltage as you actuate each
power lock switch to the Lock position. If OK, go to
Step 8. If not OK, repair the open circuit from either
or both power lock switch(es) to the CTM as
required.

(8) Probe the door lock switch output (unlock) cir-

cuit cavity of the 18-way CTM wire harness connec-
tor and check for battery voltage as you actuate each
power lock switch to the Unlock position. If OK, go to
Step 9. If not OK, repair the open circuit from either
or both power lock switch(es) to the CTM as
required.

(9) Disconnect and isolate the battery negative

cable. Reinstall the wire harness connectors to the
CTM. Connect the battery negative cable. Back-probe
the door lock driver circuit cavity of the 18-way CTM
wire harness connector and check for battery voltage
as either power lock switch is moved to the Lock
position. Repeat the test pressing the Lock button of
the Remote Keyless Entry (RKE) transmitter. If OK,
go to Step 10. If not OK using the power lock switch,
but OK with the RKE transmitter, see Power Lock
Switch in the Diagnosis and Testing section of this
group. If not OK using the RKE transmitter, but OK

Fig. 2 Power Lock Switch Continuity - Passenger

Side

PASSENGER SIDE LOCK SWITCH

SWITCH POSITION

CONTINUITY

BETWEEN

OFF

4 & 5 (LED)

LOCK

1 & 2

UNLOCK

2 & 6

LAMP (LED)

4 & 5

8P - 6

POWER LOCK SYSTEMS

DN

DIAGNOSIS AND TESTING (Continued)

with the power lock switch, see Remote Keyless
Entry Transmitter in the Diagnosis and Testing sec-
tion of this group. If not OK, with the power lock
switch or the RKE transmitter, replace the faulty
CTM.

(10) Back-probe the door unlock driver circuit cav-

ity of the 18-way CTM wire harness connector and
check for battery voltage as the power lock switch is
moved to the Unlock position. Repeat the test press-
ing the Unlock button of the RKE transmitter twice
within five seconds. If OK, see Power Lock Motor in
the Diagnosis and Testing section of this group. If not
OK using the power lock switch, but OK with the
RKE transmitter, see Power Lock Switch in the Diag-
nosis and Testing section of this group. If not OK
using the RKE transmitter, but OK with the power
lock switch, see Remote Keyless Entry Transmitter
in the Diagnosis and Testing section of this group. If
not OK, with the power lock switch or the RKE
transmitter, replace the faulty CTM.

POWER LOCK MOTOR

Before you proceed with this diagnosis, confirm

proper power lock switch, Central Timer Module
(CTM) and power lock switch output circuit opera-
tion. See Power Lock Switch and Central Timer Mod-
ule in the Diagnosis and Testing section of this
group. Remember, the CTM circuitry controls the
output to each of the power lock motors. For circuit
descriptions and diagrams, refer to 8W-61 - Power
Door Locks in Group 8W - Wiring Diagrams.

(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
CTM. If unplugging one power lock motor causes the
other motor 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 CTM 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 the Service Pro-
cedures section of this group. Test each of the trans-
mitter functions. If OK, discard the faulty batteries.
If not OK, go to Step 2.

(2) Program the suspect RKE transmitter and

another known good transmitter into the RKE mod-
ule. Use a DRB scan tool, as described in the proper
Diagnostic Procedures manual. See Remote Keyless
Entry Transmitter Programming in the Service Pro-
cedures section of this group.

(3) Test the RKE system operation with both

transmitters. If both transmitters fail to operate the
power lock system, use a DRB scan tool and the
proper Diagnostic Procedures manual for further
diagnosis of the RKE system. 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.

RELAYS

The headlamp (or security) relay is located in the

Power Distribution Center (PDC) in the engine com-
partment. The horn relay is located in the Junction
Block (JB), on the left end of the instrument panel in
the passenger compartment. The driver unlock relay
is located in the relay and fuse block on the back of
the JB underneath the left end of the instrument
panel in the passenger compartment. Each of these
relays can be tested as described in the following pro-
cedure, however the circuits they are used in do vary.
To test the relay circuits, refer to the circuit descrip-
tions and diagrams in 8W-39 - Vehicle Theft Security
System and 8W-61 - Power Locks in Group 8W - Wir-
ing Diagrams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,

REFER

TO

GROUP

8M

-

PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING

WHEEL,

STEERING

COLUMN,

OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

DN

POWER LOCK SYSTEMS

8P - 7

DIAGNOSIS AND TESTING (Continued)