Dodge RAM TRUCK 1500 1995 Service Manual page 666

B R
8W-44 INTERIOR LIGHTING 8W - 44 - 1
INTERIOR LIGHTING
INDEl
page
Buzzer Module 2
Cargo Lamps 1
Day/Night Mirror 1
Diagram Index 2
Dome Lamp 1
General Information 1
Glove Box Lamp 1
GENERAL INFORMATION
Circuit M l supplies power to the underhood lamp,
glove box lamp, dome lamp, buzzer module, cargo
lamps, and the t i m e delay relay. Circuit M50 from
the time delay relay powers the ignition switch lamp.
Circuit M l is protected by the Ignition Off Draw
(IOD) fuse i n the fuse block, cavity 17. This fuse is a
15 amp.
Power for the M l fuse is supplied on circuit A7.
This circuit originates i n the Power Distribution Cen­
ter (PDC) and is protected by a 50 amp fuse located
i n cavity 1.
IGNITION SWITCH LAMP
Circuit M50 f r o m the time delay relay supplies
voltage to the ignition switch lamp. Circuit Z3 pro­
vides ground for the lamp.
Circuit M l supplies voltage to the time delay relay.
Circuit M 2 provides ground for the relay through the
dome/cargo lamp switch or the door jamb switch.
TIME DELAY RELAY
- The time delay relay is used to allow a time-ON
function for the ignition switch lamp. Power for the
relay is provided on the M l circuit from the I O D fuse
(fuse 17) i n the fuse block.
Circuit M 2 provides ground for the time delay relay
through the r i g h t and left door j a m b switches and
the headlamp switch. When a door is OPENED, or
the headlamp switch is moved to the dome/cargo
lamp O N position, a ground path is provided for the
relay on circuit M 2 . This energizes the relay, causing
the contacts to close.
When the relay contacts close, power is provided
through the relay to circuit M50. The M50 circuit
supplies current to the ignition switch lamp. Circuit
Z3 provides ground for the lamp.
GLOfE 101 LAMP
Circuit M l f r o m the I O D fuse (fuse 17) i n the fuse
block powers the glove box lamp. A case grounded
switch, i n series after the lamp, CLOSES when the
glove box door is OPENED. The switch completes a
page
Helpful Information . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ignition Switch Lamp 1
Key-In Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Seat Belt Switch 2
Time Delay Relay 1
Underhood Lamp 1
p a t h to ground on circuit Z3.
UNDERHOOD LAMP
Circuit M l from the I O D fuse (fuse 17) i n the fuse
block supplies battery voltage for the underhood
lamp. A mercury switch, i n series after the lamp, con­
nects the lamp to ground on circuit Z l . W h e n the
hood is raised, mercury inside the switch moves to a
position where i t connects circuit M l to ground cir­
cuit Z l , i l l u m i n a t i n g the lamp.
DOME LAMP
Circuit M l from the I O D fuse (fuse 17) i n the fuse
block supplies power to the dome lamp. This circuit
is H O T at all times. The ground path for the lamp is
provided i n two different ways.
One way is through the door j a m b switches. Circuit
M 2 connects to the door j a m b switches f r o m the
dome lamp. The switches are connected to ground
circuit Z3. When a door is O P E N E D , the switch
CLOSES, completing a path to ground on circuit Z3.
The second ground path is through the headlamp
switch. Circuit M 2 is spliced i n w i t h the headlamp
switch. When the operator turns the headlamp
switch to the dome lamp O N position, a ground path
is provided through the switch on circuit Z3.
DAY/NIGHT MIRROR
The day/night m i r r o r receives power f r o m circuit
L I O when the ignition switch is i n the R U N position.
This circuit is protected by a 10 amp fuse located i n
cavity 15 of the fuse block.
Circuit Z4 provides ground for the day/night mir­
ror.
W h e n the back-up lamps switch CLOSES, circuit
L I provides a signal to the day/night mirror. The day
n i g h t m i r r o r turns OFF when the vehicle is i n re­
verse.
CARGO LAMPS
Circuit M l from the I O D fuse (fuse 17) i n the fuse
block supplies power to the cargo lamps. This circuit