ISUZU TROOPER 1998 Service Repair Manual

8D – 338 WIRING SYSTEM
2. Wiper On The Left (Or Right) Side Does Not Operate
•DISCONNECT THE HEADLIGHT WIPER SWITCH
CONNECTOR
YES
REPAIR OR REPLACE THE HEADLIGHT
WIPER SWITCH
NO
•DISCONNECT THE WIPER MOTOR CONNECTOR
THAT DOES NOT OPERATE
•WITH THE SWITCH ON, IS THERE CONTINUITY
BETWEEN SWITCH CONNECTOR TERMINALS
7 I-4 AND 6 I-4 (5 I-4 AND 6 I-4 )?
•TURN THE STARTER SWITCH ON•IS THERE BATTERY VOLTAGE APPLIED
BETWEEN THE HEADLIGHT WIPER MOTOR
HARNESS SIDE CONNECTOR 6 C-23 (6 C-30 )
AND GROUND?
YES
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT
BETWEEN
(RHD)
6 C-23 (6 C-30 ) AND 15 H-7
(LHD)
6 C-23 (6 C-30 ) AND 11 H-8
NO
•CONNECT THE MOTOR SIDE CONNECTOR
6 C-23 (6 C-30 )OF THE HEADLIGHT
WIPER MOTOR TO THE BATTERY (+)
TERMINAL AND 3 C-23 (3 C-30 ) TO THE
(–) TERMINAL
•DOES THE MOTOR ROTATE?
YES
REPAIR OR REPLACE THE WIPER
MOTOR
NO
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 3 C-23 AND
7 I-4 (3 C-30 AND 5 I-4 )

WIRING SYSTEM 8D – 339
3. Auto-stop Function Of The Wiper On The Left (Or Right) Side Does Not Operate
•DISCONNECT THE HEADLIGHT WIPER SWITCH
CONNECTOR
YES
REPAIR OR REPLACE THE SWITCH
NO
•RECONNECT THE HEADLIGHT WIPER SW
CONNECTOR AND DISCONNECT THE
HEADLIGHT WIPER MOTOR CONNECTOR
•WITH THE SWITCH SET AT “OFF” POSITION, IS
THERE CONTINUITY BETWEEN THE SWITCH
CONNECTOR TERMINALS 7 I-4 AND 8 I-4
(4 I-4 AND 5 I-4 )?
•IS THERE CONTINUITY BETWEEN
HARNESS SIDE CONNECTORS 3 C-23 AND
4 C-23 (3 C-30 AND 4 C-30 )?
YES
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT
BETWEEN 4 C-23 AND 8 I-4
(4 C-30 AND 4 I-4 )
NO
•WITH THE WIPER MOTOR CONNECTOR 6 C-23
(6 C-30 ) CONNECTED TO THE BATTERY (+)
TERMINAL, AND 3 C-23 (3 C-30 ) TO THE (–)
TERMINAL, ROTATE THE MOTOR.
•WHILE ROTATING THE MOTOR, CHANGE THE
CONNECTION OF THE (–) TERMINAL TO
2 C-23 (2 C-30 ) AND CONNECT 3 C-23
(3 C-30 ) TO 4 C-23 (4 C-30 )
YES
REPAIR OR REPLACE THE HEADLIGHT
WIPER MOTOR
NO
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT
[LHD]
BETWEEN 2 C-23 (2 C-30 ) AND 4 C-16
[RHD]
BETWEEN 2 C-23 (2 C-30 ) AND 4 C-16
•DOES THE MOTOR STOP AT THE AUTO-STOP
POSITION?
NOTE :If headlight wiper motor auto-stop on both sides does not function, it may be attributable either to
headlight wiper switch trouble or to poor grounding of connector C-16 .

8D – 340 WIRING SYSTEM
4. Wiper On The Left (Or Right) Side Does Not Stop
•STOP THE WIPER MOTOR AT THE AUTO-STOP
POSITION
YES
REPAIR A SHORT CIRCUIT BETWEEN
3 C-23 AND 7 I-4 (3 C-30 AND
5 I-4 )
NO
•IS THE CONTINUITY IN THE HEADLIGHT
WIPER SWITCH NORMAL?
YES
REPAIR OR REPLACE THE SWITCH
NO
•DISCONNECT THE WIPER MOTOR CONNECTOR•IS THERE CONTINUITY BETWEEN THE MOTOR
SIDE CONNECTOR TERMINALS 4 C-23 AND
2 C-23 (4 C-30 AND 2 C-30 )?
YES
REPAIR A SHORT CIRCUIT BETWEEN
4 C-23 AND 8 I-4 (4 C-30 AND
4 I-4 )
NO
REPAIR THE WIPER MOTOR AUTO-STOP MECHANISM,
OR REPLACE THE MOTOR
•DISCONNECT THE HEADLIGHT WIPER SWITCH
CONNECTOR
•TURN THE STARTER SWITCH ON•DOES THE WIPER MOTOR REMAIN STOPPED?

WIRING SYSTEM 8D – 341
5. Washer Motor Does Not Operate
•DISCONNECT THE HEADLIGHT WASHER MOTOR
CONNECTOR
YES
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT
BETWEEN 1 C-36 AND FUSE C-7 (10A)
NO
•CONNECT THE MOTOR SIDE CONNECTOR
TERMINAL 1 C-36 TO THE BATTERY (+)
TERMINAL, AND 2 C-36 TO THE (–) TERMINAL
YES
REPAIR OR REPLACE THE MOTOR
NO
•DISCONNET THE ALARM & RELAY CONTROL
UNIT CONNECTOR B-6
•TURN THE STARTER SWITCH ON
YES
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT
BETWEEN FUSE C-4 (10A) AND 1 B-6
NO
•TURN THE STARTER SWITCH ON
•IS THERE BATTERY VOLTAGE APPLIED
BETWEEN THE WASHER MOTOR HARNESS SIDE
CONNECTOR 1 C-36 AND THE GROUND?
•DOES THE MOTOR ROTATE?
•IS THERE BATTERY VOLTAGE APPLIED BETWEEN
THE CONTROL UNIT HARNESS SIDE CONNECTOR
1 B-6 AND THE GROUND?
•RECONNECT THE HEADLIGHT WASHER MOTOR CONNECTOR
YESNO
•IS FUSE C-4 (10A) NORMAL?
YES
REPLACE THE FUSE
NO
•IS THERE CONTINUITY BETWEEN THE HARNESS
SIDE CONNECTORS 12 B-6 AND 5 C-23
YESNO
REPLACE THE ALARM & RELAY CONTROL UNITREPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT IN
THE CIRCUIT
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT
BETWEEN 2 C-36 AND 10 B-7
•IS THERE BATTERY VOLTAGE APPLIED BETWEEN THE
HARNESS SIDE CONNECTOR 10 B-7 AND THE GROUND?

8D – 342 WIRING SYSTEM
Rear Defogger
General Description
When rear defogger switch is turned on with starter
switch on, battery voltage is applied to rear defogger
through rear defogger relay to operate rear defogger.
Alarm & relay control unit is provided with a timer.
When the operation time of the timer elapses which
has been set in advance at manufacture, the switch is
automatically turned off. (The timer operating time is
normally about 30 minutes).

WIRING SYSTEM 8D – 343
Circuit Diagram (RHD)
%38
5.0
W BATT.(+)
C-17 25A
RR DEFOG
3.0
B/Y STARTER SW
(IG1)
C-4 10A
ELEC. IGN.
3.0
L/W
3.0
B/L
3.0
B/L
3.0
B/L
3.0
B
3.0
B2.0
B 0.85
B
2.0
B2.0
B
RR DEFOGGER
RELAY
RR DEFOGGER
SW
RR DEFOGGER
B-38
B-38 0.5
L/W
2
B-38
3
41B-38
0.5
O/L0.5
O/L
0.5
O/L0.5
O/L
0.5
O/G0.5
O/G0.3
R/G 0.85
G/R
0.85
L/W0.5
L/W0.5
L/W
ALARM & RELAY
CONTROL UNIT
(RR DEFOGGER)
B-7
5
B-7
8
9B-6
G-7
1H-37
1G-32
2H-31
4H-37R-3
BODY-RR BODY-LH BODY-RHBODY-CTR
B-2
B-26
B-18
TIMER
I-17
3
I-17
4H-2520
I-17
ILLUMINATION
CONTROLLER(3)2
5
I-17
2
H-26
6
I-17 TAIL RELAY(4)
1
H-25

8D – 344 WIRING SYSTEM
Parts Location (RHD)
Legend
(1) I-17 (Rear Defogger Switch)
(2) Starter Switch
(3) H-25, H-26
(4) B-19
(5) Fuse Box (B-38)
(6) B-26
(7) G-7(8) H-37
(9) R-3
(10) Rear Defogger
(11) G-3
(12) H-31
(13) B-2
(14) B-6, B-7 (Alarm and Relay Control Unit)
8 9 10
11
12
131412
3
4
5
6
7
%38

WIRING SYSTEM 8D – 345
Circuit Diagram (LHD)
5.0
W BATT.(+)
C-17 25A
RR DEFOG
3.0
B/Y STARTER SW
(IG1)
C-4 10A
ELEC. IGN.
3.0
L/O
3.0
B/L
3.0
B/L
3.0
B/L
3.0
B
3.0
B2.0
B 0.85
B
2.0
B2.0
B
RR DEFOGGER
RELAY
RR DEFOGGER
SW
RR DEFOGGER
B-38
B-38 0.5
L/W
2
B-38
3
41B-38
0.5
O/L0.5
O/L
0.5
O/L0.5
O/L
0.5
O/G0.5
O/G0.3
R/G 0.85
G/R
0.85
L/W0.5
L/W0.5
L/W
ALARM & RELAY
CONTROL UNIT
(RR DEFOGGER)
B-7
5
B-7
8
9B-6
G-7
1H-37
1G-32
2H-31
4H-37R-3
BODY-RR BODY-RH BODY-LHBODY-CTR
B-2
B-26
B-18
TIMER
I-17
3
I-17
4H-255
I-17
ILLUMINATION
CONTROLLER(3)2
5
I-17
3
H-25
6
I-17 TAIL RELAY(4)
1
H-48
%38

8D – 346 WIRING SYSTEM
Parts Location (RHD)
Legend
(1) H-48
(2) B-2
(3) G-7
(4) Rear Defogger
(5) G-3
(6) H-37
(7) R-3
(8) H-31(9) B-26
(10) Fuse Box
(11) B-38
(12) B-18
(13) H-25
(14) Starter Switch
(15) I-17 (Rear Defogger Switch)
(16) B-6, B-7 (Alarm and Relay Control Unit)
%38
9
8
7
65
4
3
21 161514
13
12
11
10

WIRING SYSTEM 8D – 347
Diagnosis
Quick Chart for Check Points
Check pointFuse
C-4
(10A)C-17
(25A)Rear
defogger
relayAlarm &
relay
control
unitCable
harness
1 Rear defogger does not operateTrouble mode
2 Rear defogger timer does not function
Rear
defogger
SW