Maintenance Required Indicator Lamp; Malfunction Indicator Lamp - Dodge ram truck 3500 1996 Service Manual

BR INSTRUMENT PANEL SYSTEMS 8E - 15
DIAGNOSIS AND TESTING (Continued)
fluid reservoir. Inspect the reservoir for proper fluid
level and signs of damage or distortion that could
affect switch performance before you proceed with
lamp diagnosis. Refer to Group 8K - Wiper and
Washer Systems for more information. For circuit
descriptions and diagrams, refer to 8W-40 - Instru­
ment Cluster in Group 8W - Wiring Diagrams.
(1) Unplug the washer fluid level switch connector.
Install a jumper wire between the two cavities of the
connector. Turn the ignition switch to the On posi­
tion. The lamp should light. Remove the jumper wire
and the lamp should go off. I f OK, replace the faulty
washer fluid level switch. I f not OK, go to Step 2.
(2) Turn the ignition switch to the Off position.
Check for continuity between the washer fluid level
switch connector ground circuit cavity and a good
ground. There should be continuity. I f OK, go to Step
3. I f not OK, repair the open circuit as required.
(3) Disconnect and isolate the battery negative
cable. Remove the instrument cluster bezel and the
cluster assembly. Unplug the right instrument clus­
ter connector. Check for continuity between the
washer fluid switch sense circuit cavity of the right
cluster connector and a good ground. There should be
no continuity. I f OK, go to Step 4. I f not OK, repair
the short circuit as required.
(4) Check for continuity between the washer fluid
switch sense circuit cavities of the right cluster con­
nector and the washer fluid level switch connector.
There should be continuity. I f OK, replace the faulty
bulb. I f not OK, repair the open circuit as required.
MAINTENANCE REQUIRED INDICATOR LAMP
The diagnosis found here addresses an inoperative
maintenance required indicator lamp condition. If the
lamp comes on and stays on while driving, refer to
Group 25 - Emission Control Systems for diagnosis.
If no emission control system problem is found, the
following procedure will help locate a short or open
in the indicator lamp circuit. For circuit descriptions
and diagrams, refer to 8W-46 - Message Center in
Group 8W - Wiring Diagrams.
(1) Disconnect and isolate the battery negative
cable. Unplug the Powertrain Control Module (PCM)
connector C (gray). Remove the instrument cluster
bezel and the message center assembly. Do not
unplug the message center connector.
' (2) Install a jumper wire between the service
reminder indicator lamp driver circuit cavity of the
message center connector and a good ground. Con­
nect the battery negative cable. Turn the ignition
switch to the On position. The lamp should light. I f
OK, remove the jumper wire and go to Step 3. I f not
OK, replace the faulty bulb.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the message center connector. Check for con­
tinuity between the service reminder indicator lamp
driver circuit cavity of the message center connector
and a good ground. There should be no continuity. I f
OK, go to Step 4. I f not OK, repair the short circuit
as required.
(4) Check for continuity between the service
reminder indicator lamp driver circuit cavities of the
message center connector and the PCM connector C.
There should be continuity. I f OK, refer to Group 14 -
Fuel Systems for diagnosis of the PCM. I f not OK,
repair the open circuit as required.
MALFUNCTION INDICATOR LAMP
The diagnosis found here addresses an inoperative
malfunction indicator lamp condition. I f the lamp
comes on and stays on with the engine running, refer
to Group 14 - Fuel System for diagnosis. I f no fuel or
emission system problem is found, the following pro­
cedure will help locate a short or open i n the lamp
circuit. For circuit descriptions and diagrams, refer to
8W-40 - Instrument Cluster in Group 8W - Wiring
Diagrams.
(1) Disconnect and isolate the battery negative
cable. Unplug the Powertrain Control Module (PCM)
connector C (gray). Install a jumper wire between the
malfunction indicator lamp driver circuit cavity of
the PCM connector C and a good ground. Connect
the battery negative cable. Turn the ignition switch
to the On position. The lamp should light. Remove
the jumper wire and the lamp should go off. I f OK,
refer to the Powertrain Diagnostic Procedures to
diagnose the PCM. I f not OK, go to Step 2.
(2) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the instrument cluster bezel and the cluster
assembly. Do not unplug the cluster connectors.
Install a jumper wire between the malfunction indi­
cator lamp driver circuit cavity of the right cluster
connector and a good ground. Connect the battery
negative cable. Turn the ignition switch to the On
position. The lamp should light. I f OK, go to Step 3.
If not OK, replace the faulty bulb.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the right cluster connector. Check for conti­
nuity between the malfunction indicator lamp driver
circuit cavity of the right cluster connector and a
good ground. There should be no continuity. I f OK, go
to Step 4. I f not OK, repair the short circuit as
required.
(4) Check for continuity between the malfunction
indicator lamp driver circuit cavities of the right
cluster connector and the PCM connector C. There
should be continuity. I f not OK, repair the open cir­
cuit as required.