Dodge 2000 DURANGO Service Manual page 317

DN
DIAGNOSIS AND TESTING (Continued)
should be no continuity. If OK, go to Step 5. If not
OK, repair the shorted park brake switch sense cir-
cuit as required.
(5) Check for continuity between the park brake
switch sense circuit cavities of the instrument cluster
wire harness connector A and the park brake switch
wire harness connector. There should be continuity. If
OK, refer to Instrument Cluster - Preliminary
Diagnosis in the Diagnosis and Testing section of
this group for further testing of the brake warning
lamp and the instrument cluster circuitry. If not OK,
repair the open park brake switch sense circuit as
required.
CLUSTER ILLUMINATION LAMP
The diagnosis found here addresses an inoperative
instrument cluster illumination lamp condition. If
the problem being diagnosed includes inoperative
exterior lighting controlled by the headlamp switch,
that system needs to be repaired first. If the exterior
lamps controlled by the headlamp switch are inoper-
ative, refer to Headlamp Diagnosis in the Diagno-
sis and Testing section of Group 8L - Lamps for
diagnosis. If no exterior lighting system problems are
found, the following procedure will help locate a
short or open in the cluster illumination lamp circuit.
If the problem being diagnosed involves a lack of
dimming control for the odometer/trip odometer Vac-
uum Fluorescent Display (VFD), but all of the other
cluster illumination lamps can be dimmed, repair the
open headlamp switch output circuit input to the
instrument cluster. For complete circuit diagrams,
refer to Instrument Cluster in the Contents of
Group 8W - Wiring Diagrams.
(1) Check the panel lamps dimmer 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) Turn the park lamps on with the headlamp
switch. Rotate the panel lamps dimmer thumbwheel
on the headlamp switch upward to just before the
interior lamps detent. Check for battery voltage at
the panel lamps dimmer fuse in the junction block.
Rotate the panel lamps dimmer thumbwheel down-
ward while observing the test voltmeter. The reading
should go from battery voltage to zero volts. If OK,
go to Step 3. If not OK, repair the open panel lamps
dimmer switch signal circuit to the headlamp switch
as required. If the circuit tests OK, refer to Head-
lamp Diagnosis in the Diagnosis and Testing sec-
tion of Group 8L - Lamps to diagnose the headlamp
switch.
(3) Disconnect and isolate the battery negative
cable. Remove the instrument cluster. Turn the head-
lamp switch off. Remove the panel lamps dimmer
fuse from the junction block. Probe the fused panel
INSTRUMENT PANEL SYSTEMS
lamps dimmer switch signal circuit cavity of the
instrument cluster wire harness connector B. Check
for continuity to a good ground. There should be no
continuity. If OK, go to Step 4. If not OK, repair the
shorted fused panel lamps dimmer switch signal cir-
cuit as required.
(4) Install the panel lamps dimmer fuse in the
junction block. Connect the battery negative cable.
Turn the park lamps on with the headlamp switch.
Rotate the panel lamps dimmer thumbwheel on the
headlamp switch upward to just before the interior
lamps detent. Check for battery voltage at the fused
panel lamps dimmer switch signal circuit cavity of
the instrument cluster wire harness connector B. If
OK, replace the faulty cluster illumination lamp
bulb(s) and bulb holder(s). If not OK, repair the open
fused panel lamps dimmer switch signal circuit as
required.
FOUR-WHEEL DRIVE LOCK INDICATOR LAMP
The diagnosis found here addresses an inoperative
four-wheel drive indicator lamp condition. If the
problem being diagnosed is related to lamp accuracy,
be certain to confirm that the problem is with the
lamp or switch and not with a damaged or inopera-
tive transfer case or transfer case linkage. Refer to
NV231 Diagnosis or NV242 Diagnosis in the Diag-
nosis and Testing section of Group 21 - Transmission
for more information. If no transfer case problem is
found, the following procedure will help locate a
short or open in the indicator lamp circuit. For com-
plete circuit diagrams, refer to Instrument Cluster
in the Contents of Group 8W - Wiring Diagrams.
(1) Check the fused ignition switch output (run/
start) 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) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run/start) fuse in the junction block. If OK,
go to Step 3. If not OK, repair the open fused ignition
switch output (run/start) circuit to the ignition switch
as required.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Disconnect the transfer case switch wire harness con-
nector. Check for continuity between the ground cir-
cuit cavity of the transfer case switch wire harness
connector and a good ground. There should be conti-
nuity. If OK, go to Step 4. If not OK, repair the open
ground circuit to ground as required.
(4) Connect the battery negative cable. Turn the
ignition switch to the On position. Install a jumper
wire between the four wheel drive lock indicator
lamp driver circuit cavity of the transfer case switch
wire harness connector and a good ground. The four-
8E - 9