Dodge RAM TRUCK 1500 1995 Service Manual page 643

8W - 40 - 2
8W-40 INSTRUMENT CLUSTER
B R
Circuit F14 connects to the instrument cluster and
supplies battery voltage to oil pressure lamp.
When the oil pressure is below a predetermined
level the engine oil pressure switch CLOSES com­
pleting a path to ground causing the lamp to illumi­
nate.
TACHOMETER
The Powertrain Control Module (PCM) signals the
tachometer on circuit G21. The PCM provides engine
speed information to the tachometer. Circuit F14
from the fuse block provides voltage for the tachom­
eter. Circuit Zll provides ground for the tachometer.
SPEEDOMETER
The speedometer and odometer receive a signal
from the Vehicle Speed Sensor (VSS) on circuit G7.
Circuit G7 is spliced and also connects to the Power-
train Control Module (PCM).
Circuit F14 from the fuse block provides voltage for
the tachometer. Circuit Zll provides ground for the
tachometer.
VOLTMETER
Power for the voltmeter is supplied on circuit F14.
This circuit is spliced and supplies power to all the
gauges. Ground for the voltmeter is supplied on cir­
cuit Zll.
The F14 circuit is also used to measure the voltage
level. The gauge reading changes based on the sys­
tem voltage in the F14 circuit.
ABS WARNING LAMP
ALL-WHEEL ANTI-LOCK BRAKES
The ABS module controls the ABS warning lamp
through the ABS warning lamp relay. When the ABS
module grounds the warning lamp relay on circuit
B47, the relay contacts close and complete the
ground path for the ABS warning lamp. Circuit B47
connects to pin 13 of the ABS module and the coil
side of the relay. Circuit A20 from fuse 14 in the fuse
block supplies power to the coil side of the relay.
Circuit G19 from the ABS warning lamp in the in­
strument cluster is double crimped at the contact
side of the ABS warning lamp relay. Power for the
bulb is supplied by circuit F14.
REAR WHEEL ANTI-LOCK (RWAL) BRAKES
The RWAL module provides ground for the instru­
ment cluster Check Anti-Lock warning lamp on cir­
cuit G19. Circuit F14 provides voltage to the
instrument cluster to feed the warning lamp.
MALFUNCTION INDICATOR LAMP (MIL)
The Powertrain Control Module (PCM) provides
ground for the MIL on circuit G3. Circuit G3 con­
nects to cavity 32 of the PCM. When illuminated the
MIL displays the message CHECK ENGINE. For in­
formation regarding diagnostic trouble code access
using the MIL, refer to Group 14, Fuel Systems.
LOW WASHER FLUID
Circuit G29 connects the low washer fluid switch to
the warning lamp in the instrument cluster. Circuit
F14 supplies battery voltage to the lamp.
When the low washer fluid switch CLOSES, it con­
nects circuits G29 and Zl. Circuit Zl provides a
ground path, illuminating the warning lamp. Circuit
Zl also provides ground for the windshield washer
pump motor.
SEAT BELT INDICATOR WARNING LAMP
The seat belt indicator warning lamp is activated
by the buzzer module on circuit G13. Circuit G13
supplies power to instrument cluster for the lamp.
Circuit Z3 provides ground for the lamp.
HIGH-BEAM INDICATOR LAMP
Circuit G34 supplies power for the high-beam indi­
cator lamp. The ground path for the lamp is through
circuit Z3. If the vehicle has Daytime Running
Lamps (DRL), the DRL module powers circuit G34.
On vehicles not equipped with DRL, circuit G34
splices to circuit L3. Circuit L3 feeds the high beam
circuit of the headlamps.
TURN SIGNAL INDICATOR LAMPS
Circuits L61 and L60 power for the turn signal in­
dicator lamps. Circuit L61 powers the left indicator
lamp. Circuit L60 powers the right indicator lamp.
Circuit Z3 provides ground for the lamps.
PARKING BRAKE LAMP
Circuit F14 supplies power to the park brake lamp.
Ground for the park brake lamp through the case
grounded park brake switch on circuit Gil.
If the vehicle is equipped with Rear Wheel Anti-
Lock (RWAL) brakes, circuit Gil provides an input to
the RWAL module.
MANUAL TRANSMISSION UP-SHIFT LAMP
Circuit F14 supplies power for the manual trans­
mission up-shift lamp. The lamp illuminates when
the Powertrain Control Module (PCM) provides
ground for the lamp on circuit K54. Circuit K54 con­
nects to cavity 54 of the PCM.
AIRBAG WARNING LAMP
Circuit F14 supplies power for the airbag warning
lamp. The lamp illuminates when the Airbag Control
Module (ACM) provides ground for the lamp on cir­
cuit R41.