Dodge RAM TRUCK 1500 1995 Service Manual page 423

B R - — —
INSTRUMENT PANEL AND GAUGES SE -13
N O .
IDENTIFICATION
2
RWAL W A R N I N G LAMP OUTPUT
5 PARKING BRAKE SWITCH S E N S E
6 BRAKE W A R N I N G LAMP SENSE i
J958E-25
Fig. 14 RWAL Control Module Connector
N O .
IDENTIFICATION !
24
ABS W A R N I N G LAMP OUTPUT
25 BRAKE W A R N I N G LAMP S E N S E
J958E-24
Fig. 15 ABS Control Module Connector
BRAKE WARNING LAMP
The diagnosis found here addresses an inoperative
lamp condition. If the brake warning lamp stays on
with the ignition switch in the ON position and the
parking brake released, refer to Group 5 - Brakes for
diagnosis. If no service brake or parking brake prob­
lem is found, the following procedure will help locate
a short circuit or faulty switch.
(1) Turn ignition switch to START position. Lamp
should light. Release ignition switch to ON position.
Lamp should go OFF. If not OK, go to next step.
(2) Turn ignition switch to OFF position. Unplug
brake warning switch connector. Check for continuity
between switch terminal and a good ground. There
should be no continuity. If OK, go to next step. If not
OK, replace brake warning switch.
(3) Unplug parking brake switch connector. With
parking brake released, check for continuity between
switch terminal and a good ground. There should be
no continuity. Apply parking brake and check for con­
tinuity between switch terminal and a good ground.
INDICATOR LAMPS
If an individual indicator lamp is inoperative, see
the diagnostic procedure under the heading for that
lamp. If more than one indicator lamp or a combina­
tion of lamps and gauges in the instrument cluster is
inoperative, see Gauges in this section for diagnosis.
AIRBAG INDICATOR LAMP
(1) Disconnect battery negative cable. Remove in­
strument cluster bezel and cluster assembly. Do not
unplug cluster connectors.
(2) Connect battery negative cable. Check for bat­
tery voltage between bulb terminals on printed cir­
cuit within 6 seconds after turning ignition switch to
ON position. If OK, replace faulty bulb. If not OK, go
to next step.
(3) Turn ignition switch to OFF position. Discon­
nect battery negative cable. Check for continuity be­
tween cavity 9 of cluster connector A (white) and
cavity 7 of airbag control module (ACM) connector 1.
There should be continuity. If OK, refer to Group 8M
- Restraint Systems for diagnosis of ACM. If not OK,
repair open circuit as required.
ANTI-LOCK
BRAKE
SYSTEM
LAMP
The diagnosis found here addresses an inoperative
lamp condition. If the ABS lamp stays on with the ig­
nition switch in the ON position, or comes on and
stays on while driving, refer to Group 5 - Brakes for
diagnosis. If no ABS problem is found, the following
procedure will help locate a short or open in the ABS
lamp circuit.
(1) Disconnect battery negative cable. Remove in­
strument cluster bezel and cluster assembly. On mod­
els with ABS, remove ABS lamp relay from power
distribution center. Disconnect ABS/RWAL control
module connector.
(2) Install a jumper wire between cavity 14 of clus­
ter connector B (black connector) and a good ground.
Connect battery negative cable and turn ignition
switch to ON. Lamp should light. If OK, remove
jumper wire and go to next step. If not OK, replace
bulb.
(3) Turn ignition switch to OFF. Disconnect battery
negative cable and unplug cluster connector B. Check
for continuity between cavity 14 of cluster connector
B and a good ground. There should be no continuity.
If OK, go to next step. If not OK, repair short circuit
as required. ' -
(4) Check continuity between cavity 14 of cluster
connector B and cavity 2 of RWAL control module
connector (Fig. 14), or cavity 24 of ABS control mod­
ule connector (Fig. 15). There should be continuity. If
OK, refer to Group 5 - Brakes for diagnosis of RWAL
or ABS control module. If not OK, repair open circuit
as required.