Dodge RAM TRUCK 1500 1995 Service Manual page 682

EH 8W-49 OVERHEAD CONSOLE — | ! f - 49 - 1
OVERHEAD CONSOLE
When the ignition switch is in the RUN or STAET
position, circuit F12 from fuse 11, a 10 amp, in the
fuse block supplies power to the overhead console.
When the headlamps or parking lamps are ON, cir­
cuits L7 and E2 provide voltage to the overhead con­
sole for illumination. Voltage on circuit L7 informs
the overhead console that the headlamps or parking
lamps are ON. Circuit E2 from fuse 13, a 5 amp, in
the fuse block powers the illumination lamps in the
overhead console. Circuit El from the headlamp
switch feeds fuse 13 and circuit E2.
Circuit Zll provides ground for the compass.
AMBIENT TEMPERATURE SENSOR
The ambient temperature sensor is a variable re­
sistor. Circuit G31 supplies voltage from the over­
head console to the sensor. Circuit G32 is the signal
return from the sensor to the overhead console.
LAMPS
Circuit Ml supplies voltage for the reading lamps,
map lamp and dome lamp in the overhead console.
The Ignition Off Draw (IOD) fuse (fuse 17) in the
fuse block supplies voltage to circuit Ml. Circuit A7
from fuse 1 in Power Distribution Center (PDC) feeds
the IOD fuse.
Circuit Z4 grounds the reading lamps. Circuit M2
also provides ground for the reading lamps and dome
lamp.
The M2 circuit supplies ground for the overhead
console lamp in two ways. One way is through the
door jamb switches. Circuit M2 connects to the door
jamb switches. The door jamb switches connect to
ground on circuit Z3. When a door is OPENED, the
plunger in the switch CLOSES, completing a path to
ground.
The second ground path is through the headlamp
switch. When the operator turns the headlamp
switch to the dome lamp ON position, a ground path
provided on circuit M2 through the switch to ground
on circuit Z3.
HELPFUL INFORMATION
• Check the 15 amp fuse located in cavity 17 of the
fuse block
© Circuit Ml splices to supply voltage for the radio
memory, time delay relay, underhood lamp, and glove
box lamp.
• Circuit E2 splices to provide voltage to the instru­
ment cluster illumination lamps, and radio lamp.
© Check the 10 amp fuse in cavity 11 of the fuse
block
© Check the grounding point for the overhead con­
sole
DIAiRAl 1NDE1
Component _ _ _ _ _ _ _ _ ^ _ _ _ _ _ _
Ambient Air Temperature Sensor 3W-49-4
Buzzer Module .8W-49-3
Door Jamb Switches .8W-49-3
Fuse 1 (PDC) .8W-49-2
F u s e 3 (PDC) . . . . . . . . . . . . .8W-49-2
Fuse 11 (Fuse Block) . . . . . . . . . . . . . . . . . . . . . .8W-49-2
Fuse 13 (Fuse Block) . . . .8W-49-2
Fuse 17 (Fuse Block) .8W-49-2
Fuse 18 (Fuse Block) .8W-49-2
Headiamp Switch .8W-49-2, 3
Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . . . .8W-49-2
Overhead Console . . . . . . . . . . . . . . . . . . . .8W-49-2, 3, 4
Overhead Map Lamp .8W-49-4
Time Delay Relay . . . . . . . . . . . . . . . . . . . . . . . .8W-49-3
OVERHEAD
CONSOLE