JEEP YJ 1995 Service And Repair Manual

INTERIOR LIGHTING
INDEX
page page
Accessory Lamp and Heater Control Panel Lamp . . 1
Combination Buzzer........................ 1
Courtesy Lamps and Dome Lamps............. 1
Diagram Index............................ 2General Information........................ 1
Transmission Range Lamp................... 1
Underhood Lamp.......................... 1
GENERAL INFORMATION
Circuit M1 supplies power to the underhood lamp,
dome lamp, right courtesy lamp and left courtesy
lamp. Fuse 12 in the Power Distribution Center
(PDC) protects circuit M1. Circuit A4 from fuse 8 in
the PDC supplies voltage to fuse 12 and circuit M1.
Fuse 12 is referred to as the Ignition Off Draw (IOD)
fuse.
COURTESY LAMPS AND DOME LAMPS
Circuit M1 supplies battery voltage to the dome
lamps and the right and left courtesy lamps. Circuit
M2 provides ground for the lamps through either the
case grounded door jamb switches or through the
dimmer switch to circuit Z1.
In the ON position, the dimmer switch connects
circuit M2 to ground on circuit Z1. When a door
opens, the case grounded door jamb switch closes and
provides ground for the lamps on circuit M2.
HELPFUL INFORMATION
²Circuit M1 also supplies voltage for radio memory,
underhood lamp and the ABS data link connector.
UNDERHOOD LAMP
Circuit M1 supplies battery voltage for the under-
hood lamp. A mercury switch in series after the lamp
connects the lamp to ground on circuit Z1. When the
hood is raised, mercury inside the switch moves to a
position where it connects circuit M1 to circuit Z1, il-
luminating the lamp. The underhood lamp is wired
in parallel with other components on circuit M1.
ACCESSORY LAMP AND HEATER CONTROL PANEL
LAMP
Circuit E1 from the dimmer switch supplies bat-
tery voltage to fuse 10 in the fuse block when the
dimmer switch is in the LOW or ON position. Fuse
10 protects circuit E2 which supplies power to the
heater control panel lamp and the accessory lamp.
Circuit Z1 provides ground for each lamp.
TRANSMISSION RANGE LAMP
Circuit E1 from the dimmer switch supplies bat-
tery voltage to fuse 10 in the fuse block when thedimmer switch is in the LOW or ON positions. Fuse
10 protects circuit E2 which supplies power to the
transmission range lamp. The lamp is case grounded.
COMBINATION BUZZER
The combination buzzer module sounds an audible
warning tone. The tone sounds for seat belt warning
and when the key is in the ignition switch while the
drivers door is open. The tone also sounds when the
ignition switch is in the ON position while the driv-
ers side seat belt is not buckled. Refer to Group 8U
for buzzer operation.
Fuses 3 and 9 in the fuse block protect the combi-
nation buzzer. Fuse 3 powers circuit F32 which con-
nects to the buzzer. Circuit A6 from fuse 3 in the
Power Distribution Center (PDC) supplies power to
the fuse block for circuit F32.
Circuit G5 from fuse 9 also provides voltage to the
combination buzzer when the ignition switch is in
the START or RUN position. The ignition switch con-
nects circuit A1 from fuse 4 in the PDC to circuit
A21. Circuit A21 connects to the fuse block.
When the key-in switch closes, it connects circuit
G26 to circuit G16. Circuit G16 connects to the driv-
ers side door jamb switch. When the drivers side door
is open and the key-in switch is closed, the case
grounded door jamb switch closes and supplies
ground for the buzzer. Circuit G26 from the combina-
tion buzzer connects to the key-in switch.
Circuit G13 form the buzzer powers the seat belt
warning lamp in the instrument cluster. Circuit Z1
at the instrument cluster provides ground for the
lamp.
Circuit G10 from the buzzer connects to the seat
belt switch. When the seat belt is unlatched, the seat
belt switch closes providing ground on circuit Z1.
Circuit Z1 also grounds the combination buzzer
module.
HELPFUL INFORMATION
²Circuit F32 also powers the stop lamp switch.
²Circuit G5 also provides power for the instrument
cluster gauges and warning lamps, heated rear win-
dow relay and A/C compressor clutch relay. On Cana-
J8W-44 INTERIOR LIGHTINGÐYJ VEHICLES 8W - 44 - 1

dian vehicles, circuit G5 also powers the Daytime
Running Lamps (DRL) module.DIAGRAM INDEX
Component Page
Combination Buzzer.......................8W-44-5
Courtesy Lamps.........................8W-44-4
Dome Lamps...........................8W-44-4
Door Jamb Switches......................8W-44-4
Fuse 3 (Fuse Block).......................8W-44-5
Fuse 3 (PDC).........................8W-44-3, 5
Fuse 4 (PDC)...........................8W-44-5
Fuse 8 (Fuse Block).......................8W-44-3
Fuse 8 (PDC)...........................8W-44-4
Fuse 9 (Fuse Block).......................8W-44-5
Fuse 10 (Fuse Block)......................8W-44-3
Fuse 12 (PDC)..........................8W-44-4
Headlamp Switch.........................8W-44-3
Ignition Switch..........................8W-44-5
Illumination Lamps.......................8W-44-3
Key-In Switch...........................8W-44-5
Panel Lamp Dimmer Switch................8W-44-3, 4
Seat Belt Switch.........................8W-44-5
Underhood Lamp.........................8W-44-4
8W - 44 - 2 8W-44 INTERIOR LIGHTINGÐYJ VEHICLESJ

RADIO
RADIO MEMORY
Circuit M1 from the Ignition Off Draw (IOD) fuse
in the Power Distribution Center (PDC) supplies
power for the radio memory. The IOD fuse is re-
moved during vehicle shipping to prevent excessive
battery draw.
Circuit A4 from fuse 8 in the PDC supplies voltage
to the IOD fuse in cavity 12. Circuit A4 is HOT at all
times.
RADIO ILLUMINATION
Circuit E2 supplies battery voltage to the radio il-
lumination lamps when the headlamps or parking
lamps are ON and the dimmer switch is in the LOW
or ON positions.
Circuit E22 supplies battery voltage for the radio
clock and station frequency display. Circuit E22 orig-
inates at the radio illumination relay and is fed by
either circuit F30 or circuit E2 depending on the
switch position inside the relay.
When the headlamps and parking lamps are OFF,
the radio illumination relay is in its normal At-Rest
position. In the At Rest position, the relay connects
circuit F30 from fuse 7 in the fuse block to circuit
E22.
When the headlamps or parking lamps are ON, cir-
cuit L7 from the headlamp switch supplies battery
voltage to the coil side of the radio illumination relay.
Circuit Z1 provides ground for the coil side of the re-
lay.
When voltage is present on circuit L7, the radio il-
lumination relay switches from its at rest position to
connect circuit E2 to circuit E22.
HELPFUL INFORMATION
²Circuit A31 supplies voltage to the fuse block for
circuit F30 when the ignition switch is in the AC-
CESSORY or RUN positions. In these positions the
ignition switch connects circuit A1 from fuse 4 in the
PDC to circuit A31. Circuit A31 powers a bus bar in
the fuse block that feeds circuit F30 through fuse 7.
²Circuit A6 from fuse 3 in the PDC supplies power
to the fuse block for fuse 8. Fuse 8 protects circuit
F33. When the headlamps or parking lamps are ON,the headlamp switch connects circuit F33 to circuit
L7. When the adjustable dimmer switch is in the
LOW to ON positions, it connects circuit L7 to circuit
E1. Circuit E1 powers fuse 10 in the fuse block. Fuse
10 in the fuse block protects circuit E2.
SPEAKERS
Circuit X53 feeds the speaker on the left side of the
instrument panel. Circuit X55 is the return from the
speaker to the radio.
Circuit X54 feeds the right instrument panel
speaker. Circuit X56 is the return from the speaker
to the radio.
The speaker feed and return circuits are double
crimped at the front speakers and continue to the
connector for the rear speakers. If the vehicle is not
equipped with the rear speaker sound bar, a jumper
is installed in the harness to simulate rear speaker
load.
Circuit X51 feeds the left rear speaker. Circuit X57
is the return from the speaker to the radio.
Circuit X52 feeds the right rear speaker. Circuit
X58 is the return from the speaker to the radio.
DIAGRAM INDEX
Component Page
Fuse 3 (PDC)...........................8W-47-3
Fuse 4 (PDC)...........................8W-47-2
Fuse 7 (Fuse Block).......................8W-47-2
Fuse 8 (Fuse Block).......................8W-47-3
Fuse 8 (PDC)...........................8W-47-2
Fuse 10 (Fuse Block)......................8W-47-3
Fuse 12 (PDC)..........................8W-47-2
Headlamp Switch.........................8W-47-3
Ignition Switch..........................8W-47-2
Left Front Speaker........................8W-47-4
Left Rear Speaker........................8W-47-5
Panel Lamp Dimmer Switch..................8W-47-3
Radio............................8W-47-2, 3, 4
Radio Illumination Relay....................8W-47-2
Right Front Speaker.......................8W-47-4
Right Rear Speaker.......................8W-47-5
J8W-47 AUDIO SYSTEMÐYJ VEHICLES 8W - 47 - 1