Chrysler RAM TRUCK 2500 1994 Service Manual page 412

• INSTRUMENT PANEL AND GAUGES 8E - 15
nector. I f not OK, repair circuit as required. I f OK,
refer to Powertrain Diagnostic Test Procedures man­
ual for diagnosis of PCM.
UPSHIFT INDICATOR
The upshift indicator lamp is controlled by
the P C M .
(1) Pull instrument cluster from dash. Do not un­
plug cluster connectors. Refer to Instrument Cluster
Replacement for removal procedures.
The bulb location is labeled on the cluster
printed circuit. Refer to Group 8W - Wiring Di­
agrams for terminal information.
(2) Disconnect black 60-way connector at PCM,
and install a jumper wire from cavity #54 to a good
ground. Turn ignition switch to ON position and
check for battery voltage between bulb B+ and
ground terminals.If OK, replace bulb. I f not OK, con­
tinue to next step.
(3) With ignition switch i n ON position, check for
battery voltage between B+ terminal of bulb and a
known good ground. I f OK, go to step (5). I f not OK,
continue to next step.
(4) Unplug cluster connector B (black). With igni­
tion switch i n ON position, check for battery voltage
at connector cavity #8. I f OK, replace cluster printed
circuit board. I f not OK, repair open circuit to fuse
#12 as required.
(5) With ignition switch in OFF position, check for
continuity between ground terminal of bulb and clus­
ter connector A (white), cavity #3. There should be
continuity. I f OK, continue to next step. I f not OK,
replace cluster printed circuit board.
(6) Check for continuity from cluster connector A
(white), cavity #3 to cavity #54 of PCM 60-way con­
nector. I f not OK, repair circuit as required. I f OK,
refer to Powertrain Diagnostic Test Procedures man­
ual for diagnosis of PCM.
ABS (CHECK ANTI-LOCK)
The A B S lamp is controlled by the rear wheel
anti-lock (RWAL) module or the anti-lock brake
system (ABS) module, depending upon vehicle
equipment.
(1) Pull instrument cluster from dash. Do not un­
plug cluster connectors. Refer to Instrument Cluster
Replacement for removal procedures.
The bulb location is labeled on the cluster
printed circuit. Refer to Group 8W - Wiring Di­
agrams for terminal information.
(2) Check for battery voltage between bulb B+ and
ground terminals within 30 seconds after turning ig­
nition switch to ON position. I f OK, replace bulb. I f
not OK, continue to next step.
(3) With ignition switch i n ON position, check for
battery voltage between B+ terminal of bulb and a
known good ground. I f OK, go to step (5). I f not OK,
continue to next step.
(4) Unplug cluster connector B (black). With igni­
tion switch i n ON position, check for battery voltage
at connector cavity #8. I f OK, replace cluster printed
circuit board. I f not OK, repair open circuit to fuse
#12 as required.
(5) With ignition switch i n OFF position, check for
continuity between ground terminal of bulb and clus­
ter connector B (black), cavity #14. There should be
continuity. I f OK, continue to next step. I f not OK,
replace cluster printed circuit board.
(6) Check for continuity from cluster connector B
(black), cavity #14 to RWAL module connector cavity
#2, or ABS module connector cavity #24. I f not OK,
repair circuit as required. I f OK, refer to Group 5 -
Brakes for diagnosis of RWAL or ABS module.
L E F T AND RIGHT TURN SIGNAL INDICATORS
The turn signals are controlled by the multi-func­
tion switch, attached to the steering column.
(1) Pull instrument cluster from dash. Do not un­
plug cluster connectors. Refer to Instrument Cluster
Replacement for removal procedures.
The bulb location is labeled on the cluster
printed circuit. Refer to Group 8W - Wiring Di­
agrams for terminal information.
(2) With ignition switch i n ON position, and multi­
function switch i n position (right or left, depending
upon indicator being tested), check for battery volt­
age between B+ terminal and ground terminal of
bulb. I f OK, replace bulb. I f not OK, continue to next
step.
(3) With ignition switch i n OFF position, check for
continuity between ground terminal of bulb and clus­
ter connector A, cavity #10. I f OK, continue to next
step. I f not OK, replace cluster printed circuit board.
(4) Unplug cluster connector A (white) and check
for continuity between cavity #10 and a good ground.
There should be continuity. I f OK, continue to next
step. I f not OK, repair open circuit to ground as re­
quired.
(5) With ignition switch i n ON position, and multi­
function switch i n position (right or left, depending
upon indicator being tested), check for battery volt­
age at cluster connector A (white), cavity #14 (right)
or cavity #12 (left). I f OK, continue to next step. I f
not OK, go to step (7).
(6) With ignition and multi-function switches still
positioned as i n step (5), check for battery voltage at
B+ terminal of bulb. I f not OK, replace cluster
printed circuit board.
(7) With ignition switch i n OFF position, check
continuity between cluster connector A (cavity #14 -
right, cavity #12 - left) and multi-function switch con­
nector (cavity #11 - right, cavity #16 - left). I f not OK,
repair open circuit as required. I f OK, refer to Group
8J - Turn Signals for diagnosis of multi-function
switch.