light ISUZU TROOPER 1998 Service Repair Manual

WIRING SYSTEM 8DÐ237
Dome Light, Luggage Room Light,
Courtesy Light and Map Light
General Description
This circuit consists of the starter switch, door
switch, dome light, luggage room light, courtesy
light, map light, and alarm & relay control unit.
The dome light lights up when any one of doors
except the tailgate is opened with the switch set at
the door mode.
The courtesy lights for the front doors are controlled
by front door switchÐLH.
The luggage room light illuminates by opening the
tailgate when the switch is set at the door mode.
The map light illuminates by turning the switch on.
All these lights light up by turning on respective
switches regardless of the position of the starter
switch key.
The buzzer in the alarm & relay control unit sounds
to remind the driver to turn off the lights when the
starter switch is turned off.

8DÐ238 WIRING SYSTEM
Circuit Diagram (RHD)-1
TAIL
RELAY
(4)
MAP
LIGHT
5.0
W
0.5
R/W
0.5
R/W
0.5
R/W
0.5
R/W C-16 10A
CLOCK(B), ROOMBATT. (+)
STARTER SW
(IG1)
3.0
B/Y
C-4 10A
ELEC. IGN
0.5
R/Y
LUGGAGE
ROOM
LIGHT
1
R-82R-6
16H-32
1
L-2
R-63
H-217
A
TAIL
GATE SW
0.5
B
1.25
B
BODY-RRR-3R-6
0.5
R/W
0.5
GR/W0.5
R/W
1D-18
10H-18
14H-46
4
B-62
B-6
ALARM & RELAY CONTROL UNIT
1
B-610
B-64H-15
D-18
2
FRT
COURTESY
LIGHT-LH
0.5
GR/R0.5
GR/W
0.85
G/R 0.5
GR/W
R-21
FRT DOOR
SW-LH
0.5
GR/W0.5
R/W0.5
R/W
0.5
R/W0.5
L/W 1 2
D-7
10H-22D-7
2H-22 2
H-18
FRT
COURTESY
LIGHT-RH
0.5
GR/W
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WIRING SYSTEM 8DÐ239
Circuit Diagram (RHD)-2
0.5
GR/G0.5
GR/G0.5
GR/G0.5
GR/G0.5
R 0.5
R/W
0.5
R/W
DOME
LIGHT
(W/O TIMER)
5
B-65H-21
9
0.85
B
2.0
B0.5
GR/W
FRT
DOOR SW
-RHRR
DOOR SW
-LHRR
DOOR SW
-RH
0.5
GR/R
0.5
GR/B
0.5
GR/B 0.5
GR/B
2.0
B
B-71L-3
DOME
LIGHT
(W/ TIMER)4
H-45
2S-1S-1
1H-455
L-3
2A
A
ON
DOOROFF
B-2
B-18
BODY-LH BODY-RH2.0
B
B-26
BODY-CTR
K-21
3
B-6ALARM & RELAY CONTROL UNIT
ALARM & RELAY CONTROL UNIT
5
H-47
R-11
R-111
6
B-6
11H-32
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WIRING SYSTEM 8DÐ241
Circuit Diagram (LHD)-1
TAIL
RELAY
(4)
MAP
LIGHT
5.0
W
0.5
R/W
0.5
R/W
0.5
R/W
0.5
R/W C-16 10A
CLOCK(B), ROOMBATT. (+)
STARTER SW
(IG1)
3.0
B/Y
C-4 10A
ELEC. IGN
0.5
R/Y
LUGGAGE
ROOM
LIGHT
1
R-82R-6
16H-32
1
L-2
R-63
H-217
A
TAIL
GATE SW
0.5
B
1.25
B
BODY-RRR-3R-6
0.5
R/W
0.5
GR/W0.5
R/W
1D-18
10H-18
5H-47
4
B-62
B-6
ALARM & RELAY CONTROL UNIT
1
B-610
B-64H-15
D-18
2
FRT
COURTESY
LIGHT-LH
0.5
GR/R0.5
GR/W
0.85
G/R 0.5
GR/W
K-21
FRT DOOR
SW-RH
0.5
GR/W0.5
R/W0.5
R/W
0.5
R/W0.5
L/W 1 2
D-7
10H-22D-7
2H-22 2
H-18
FRT
COURTESY
LIGHT-RH
0.5
GR/W
D08RW812

8DÐ242 WIRING SYSTEM
Circuit Diagram (LHD)-2
0.5
GR/G0.5
GR/G0.5
GR/G0.5
GR/G0.5
R 0.5
R/W
0.5
R/W
DOME
LIGHT
(W/O TIMER)
5
B-65H-21
9
0.85
B
2.0
B0.5
GR/W
FRT
DOOR SW
-LHRR
DOOR SW
-LHRR
DOOR SW
-RH
0.5
GR/R
0.5
GR/B
0.5
GR/B 0.5
GR/B
2.0
B
B-71L-3
DOME
LIGHT
(W/ TIMER)4
H-45
2S-1S-1
1H-455
L-3
2A
A
ON
DOOROFF
B-2
B-18
BODY-RH BODY-LH2.0
B
B-26
BODY-CTR
R-21
3
B-6ALARM & RELAY CONTROL UNIT
ALARM & RELAY CONTROL UNIT
14
H-46
R-11
R-111
6
B-6
11H-32
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8DÐ272 WIRING SYSTEM
General Description
The circuit consists of cruise control unit, cruise
main switch, combination switch, clutch switch
(M/T), mode switch (A/T), brake switch, actuator and
indicator lights.
Cruise control system keeps the vehicle running at a
fixed speed until a signal canceling this fixed speed
is received.
When the cruise main switch is turned on with the
vehicle in the running mode, the battery voltage is
applied to the control unit.
When a signal from the combination switch is input
to the control unit while vehicle is in this state, the
actuator is activated to operate the system. Also,
while the system is operating, the cruise indicator
light in the meter panel lights up.
Set Function
When the cruise main switch turned on and the set
switch is depressed with the vehicle speed within
the set limit and cancel operation is refused, the
vehicle speed when the set switch is released is
stored in the control unit as the set speed. But in
case of the vehicle speed is over maximum limit
speed of cruise control, maximum limit speed in the
control unit is stored as the set speed.
Resume Function
Unless the vehicle speed falls below the minimum
speed limit after canceling the set speed by the
cancel switch, pushing the resume switch causes
the vehicle to resume the speed before cancellation.
Acceleration Function
During cruise control driving, pushing the
acceleration switch (on time is more than 0.6 sec.)
causes an increase in cruise speed and vehicle
accelerates at a controlled rate untill acceleration
switch released.
Vehicle speed at the acceleration switch released
plus 1.0 km/h is stored in the control unit as the set
speed.
Tap up Function
During cruise control driving, pushing the coast
switch (on time is more than 0.6 sec.) causes a
decrease in cruise speed and the vehicle decelerate
at a controlled rate until coast switch released.
Vehicle speed at the coast switch released minus
approx. 1.0 km/h is stored in the control unit as the
set speed.
Tap down Function
During cruise control driving, the set speed can be
lowered approx. 1.0 km/h each time by operating
the coast switch quickly within 0.6 sec.
Cancel Function
During cruise control driving, the cruise control is
released if the control unit receives a signal from the
cancel switch, mode switch, clutch switch or brake
switch. The set speed is still stored.
Down Cancel Function
The cruise control is canceled when the vehicle
speed becomes the set speed minus 20 km/h during
the cruise control working and the set speed is
erased.
Over Drive (OD) Cancel Function
OD cancel function is required when the vehicle
speed becomes the set speed minus 3 km/h during
the cruise control working.
OD cancel function is enabled when the acceleration
function and/or resume function are working except
the vehicle speed is in more than 120 km/h.
Cruise Control

8DÐ274 WIRING SYSTEM
Circuit Diagram (RHD)-2
0.5
O
0.5
BR/B0.5
BR/R0.5
BR/R
0.5
BR/B 5.0
W
0.85
G/W
0.85
G/Y
0.5
G/Y 0.85
G/YC-14 15A
STOP,
A/T CONT
ACTUATOR BRAKE
SW
INDICATOR
LIGHT
(METER)
CRUISE CONTROL UNIT
BATT.(+)
STOP
LIGHT
2
B-9
3.0
B/Y
0.5
L/YC-10 10A
METER,GAUGE STARTER SW
(IG1)
B-131B-13
B-13H-73B-13
3C-37
7122 4
C-37
4
8B-914H-80.5
BR/W
0.5
BR/W
C-37
1
11H-70.5
BR
0.5
BR
C-37
2
19H-7
7
B-915
B-9
6
B-914
B-914H-26
H-32
0.5
L/Y
0.5
B/O
0.3
B/O0.5
GR/L
0.3
GR/L
0.5
GR/L0.5
LG/W0.5
LG/W
13
B-915H-2618
I-926I-9(W/T.O.D.)
VEHICLE
SPEED SENSOR
(3)
PCM
(F10)
19
I-9
CRUISE
CRUISE
MAIN
16
I-915I-9
17
I-9
5
B-97H-8
9
B-92H-811H-10
CRUISE
CRUISE
MAINH-266
M
D08RW662

WIRING SYSTEM 8DÐ277
Circuit Diagram (LHD)-2
0.5
O
0.5
BR/B0.5
BR/R0.5
BR/R
0.5
BR/B 5.0
W
0.85
G/W
0.85
G/Y
0.5
G/Y 0.85
G/YC-14 15A
STOP,
A/T CONT
ACTUATOR BRAKE
SW
INDICATOR
LIGHT
(METER)
CRUISE CONTROL UNIT
BATT.(+)
STOP
LIGHT
2
B-9
3.0
B/Y
0.5
L/YC-10 10A
METER,GAUGE STARTER SW
(IG1)
B-131B-13
B-13H-123B-13
3C-37
106 2 4
C-37
4
8B-97H-120.5
BR/W
0.5
BR/W
C-37
1
3H-120.5
BR
0.5
BR
C-37
2
15H-12
7
B-915
B-9
6
B-914
B-913H-48
H-32
0.5
L/Y
0.3
B/O
0.3
B/O0.3
GR/L
0.3
GR/L
0.5
GR/L0.5
LG/W0.5
LG/W
13
B-912H-48VEHICLE
SPEED SENSOR
(3)
PCM
(F10) 16
I-915I-9
17
I-9
5
B-92H-7
9
B-98H-811H-10
CRUISE
CRUISE
MAINH-2510
M
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WIRING SYSTEM 8DÐ279
Diagnosis
The cruise control unit uses the cruise main indicator light and diagnoses the failure, when the control unit
detects abnormality on the table below.
PART POSIBLE CAUSE DETECTION PERIOD DTC
Motor system short circuit Energizing motor 1Ð1
Clutch system short circuit Energizing clutch 1Ð2
Actuator Clutch system open circuit Energizing clutch 1Ð2
Mechanical defect Cruise controlling 1Ð3
Close side of motor system open circuit Cruise controlling 1Ð1
CruiseOpen side of motor system continuously energizing While starter sw on 1Ð4
control unit
Clutch output abnormality While starter sw on 1Ð4
VehicleSignal of vehicle speed disconnection Cruise controlling 2Ð1
speed sensor
Signal of vehicle speed abnormality Cruise controlling 2Ð1
SwitchTurning on switch at all times While starter sw on 3Ð1
Turning on switch at the same time. While starter sw on 3Ð1
DTC: Diagnostic Trouble Code
DTC Display Condition
1. While starter switch on and vehicle speed is 0 km/h, the DTC output begins in top priority by cancel switch
turn on and off being repeated three times for 2 sec. while cruise main switch pushing on, and stops the
DTC output whether vehicle speed is more than 10 km/h or the resume switch is turned on.
2. The cruise control unit outputs the DTC(s) in order from small figure of the code.
3. The header of display of DTC(s) is assumed 4 sec., and it is 2 sec. between different kind of codes.
4. The DTC(s) are erased with the starter switch turned off.
DTC Display Format
1. When no DTCs are detected. (The unit : sec.)
2. When two or more DTCs are detected. (The unit ; sec.)
0.25 0.25
Code 1–1 Code 2–2 410.5
11 1 1 1 1 12

8DÐ284 WIRING SYSTEM
Anti-lock Brake System (ABS)
General Description
The circuit consists of EHCU (Electronic Hydraulic
Control Unit), wheel speed sensor, GÐsensor,
stoplight switch or brake switch (w/cruise control),
backup light switch, transmission switchÐ1, 2,
indicator light and data link connector.
EHCU controls brake fluid pressure applied to front
and rear wheels to prevent wheels from locking by
using speed sensor and GÐsensor signals.
Based on wheel speed signals from speed sensor,
EHCU activates solenoid valves incorporated into
the control unit to increase, maintain or decrease
brake fluid pressure.
Refer to AntiÐlock Brake System in Brakes section.