ISUZU TROOPER 1995 Workshop Manual

CHASSIS ELECTRICAL 8 -111
DIAGNOSIS
QUICK CHART FOR CHECK POINTS
1. Turn signal light, hazard warning light, and cornering light
~·
Fuse
Turn Ha-Turn Cornering Cornering Cable Flasher C-3 F-3 cornering
zard
unit signal light light harn-
e (15A)
(15A)
sw
sw bulb bulb relay ess
1-1 Turn signal light does not 0
0 0 0 0
flash. (1) (4) (3) (2) (5)
1-2 Turn
signal light flashes 0 0
too quickly. (1) (2)
1-3 Both
cornering lights 0
0 0
0
inoperative. (1)
(4) (3) (2)
1-4 Cornering light on the left 0 0 0
(or
right) side inoperative. (2) (1) (3)
1-5 Cornering light remains on. 0 (1)
NOTE: Figure in parenthesis"{ )"indicates the order of inspection.
2. Backup light, horn
~·
Fuse
Backup Backup
Horn Horn Cable C-3 F-3 light SW/ light Horn switch relay
harness
e {15A) {15A) modeSW bulb
2-1 Both
backup lights inoperative. 0 0 0 (1) {3) {2)
2-2 Backup light on
the left (or right) 0 0
side do not light up {1) (2)
2-3 Backup lights remain on. b {1)
2-4 Horns do not sound. 0 0
0
0 0 {1) (4) {5) {2) (3)
2-5 Horns do not shut off. 0 0 0 {2) (1) (3)
NOTE: Figure
in parenthesis "{ )" indicates the order of inspection.

8-112 CHASSIS ELECTRICAL
1-1 TURN SIGNAL LIGHT DOES NOT FLASH
~ ..
I • IS FUSE C-3 (15A) NORMAL?
I
YES
I NO I
I
• IS THE FLASHER UNIT NORMAL? I REPLACE THE FUSE I
I
YES
I NO I
I
• DISCONNECT THE CONNECTORS OF THE HAZARD REPLACE
THE FLASHER UNIT
WARNING SWITCH
• TURN THE STARTER SWITCH ON .
• IS THERE A BATTERY VOLTAGE APPLIED BETWEEN THE
HAZARD WARNING SWITCH HARNESS SIDE CONNECTOR 8 WJ] AND THE GROUND?
I
YES
I NO I
I
• WITH THE HAZARD WARNING SWITCH TURNED OFF, IS REPAIR A POOR CONNECTION AT THE CONNEC ORS THERE CONTINUITY BETWEEN
THE SWITCH CONNEC-OR AN OPEN CIRCUIT BETWEEN THE FUSE C-3 ( SA) ~ TORS 7 [Iill AND 8 WJ] 7 8!ITIJ.
I
YES
J NO I
I
• DISCONNECT THE CONNECTORS OF THE FLASHER UNIT • REPAIR OR REPLACE THE SWITCH I • IS THERE A BATTERY VOLTAGE APPLIED BETWEEN THE FLASHER UNIT HARNESS SIDE CONNECTOR 1 IB-531 AND THE GROUND?
I
YES
I NO I
I
• IS IB-191 GROUNDED SECURELY? I REPAIR A POOR CONNECTION AT THE CONNEC ORS
OR AN OPEN CIRCUIT BETWEEN THE HARNESS SIDE
CONNECTORS 7 WJ] -1IB-53I.
I
YES
I NO I
I
• IS THERE CONTINUITY BETWEEN THE HARNESS SIDE GROUNDED IT SECURELY I CONNECTORS 3IB-s3l -IB-191 7
~
I
YES
I NO I
I I
CONTINUED ON THE FOLLOWING PAGE CONTINUED ON THE FOLLOWING PAGE
•

CONTINUED FROM THE PREVIOUS PAGE
I
• DISCONNECT THE CONNECTORS AT THE TURN SIGNAL/
CORNERING LIGHT SWITCH.
• IS THER~TINUITY BETWEEN THE SWITCH CONNEC-
TORS 3 B-12 -4IIB-1jl (WHEN TURNING TO THE LEFT), AND BETWEEN 3 B-12 -5 IB-121 (WHEN TURNING TO THE RIGHT)?
I
I
YES I
I
CHASSIS ELECTRICAL 8-113
CONTINUED FROM THE PREVIOUS PAGE
I
REPAIR A POOR CONNECTION AT T ~ONNE~S. ~AND~. OR AN OPEN CIRCUIT BETWEEN 3 B-
I
NO I
I
REPAIR
A POOR CONNECTION OF THE CONNECTORS OR AN REPAIR OR REPLACE THE SWITCH.
OPEN CIRCUIT BETWEEN THE HARNESS SIDE CONNECTORS
2 IB-531 -3 IB-121
1-2 TURN SIGNAL LIGHT FLASHES TOO QUICKLY
REINSTALL OR REPLACE THE BULB, REPAIR AN OPEN
CIRCUIT IN THE CIRCUIT, OR CHECK THE GROUND CONNECTION

8 -114 CHASSIS ELECTRICAL
1-3 BOTH CORNERING LIGHTS INOPERATIVE
~ : ...
DO THE HEADLIGHT LIGHTS COME ON? I •
I
YES
I NO I
1
• IS FUSE C-3 {15A) NORMAL? I TURN THE HEADLIGHT ON. {REFER TO DIAGN
PSIS
CHART
FOR HEADLIGHT.)
I
YES
I NO I
I
• IS 5 IC-161 GROUNDED SECURELY? REPLACE THE FUSE I
I
YES
I NO I
I
• DISCONNECT THE CONNECTORS AT THE CORNERING RELAY . GROUND IT SECURELy I
• TURN ON THE STARTER SWITCH AND THE LIGHTING SWITCH .
• IS THERE A BATTERY VOLTAGE APPLIED BETWEEN THE
RELAY
HARNESS SIDE CONNECTOR 3 IX-221 AND GROUND, AND NBETWEEN 4 IX-221 AND GROUND?
~
I
YES
I NO I
I
• IS THE CORNERING RELAY NORMAL? I REPAIR A POOR CONNECTION OF THE CONNEC TORS
OR AN OPEN CIRCUIT BETWEEN FUSE C-3 ~ 3 IX-221 OR BETWEEN FUSE F-4 {15A)-4 X-2~
I
YES
I NO I
I
• DISCONNECT THE CONNECTORS AT THE TURN SIGNAL/ REPAIR OR REPLACE THE RELAY I CORNERING LIGHT SWITCH.
• IS THERE A BATTERY VOLTAGE APPLIED BETWEEN THE
SWITCH HARNESS SIDE CONNECTOR 11IB-12I AND GROUND?
I
YES
I NO I
I
• IS THERE CONTINUITY BETWEEN THE CORNERING LIGHT REPAIR A
POOR CONNECTION AT THE CONNI;,C
SWITCH CONNECTORS
11IB·121-i IB-yl {WHEN TORS OR AN OPEN CIRCUIT BETWEEN 2IX-22I
TURNING LEFT), AND BETWEEN 11 B-12 -10 IB-121 AND 11IB-12I
~ {WHEN TURNING RIGHT)?
I
YES
NO I
cbNTINUED ON THE FOLLOWING PAGE I CONTINUED ON THE FOLLOWING PAGE
..

•
•
•
•
CONTINUED FROM THE PREVIOUS PAGE
I
REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN OPEN
CIRCUIT BElWEEN THE HARNESS SIDE CONNECTORS I IX-221 -I IX-141.
CHASSIS ELECTRICAL 8 -115
CONTINUED FROM THE PREVIOUS PAGE
REPAIR OR REPLACE THE SWITCH.
1-4 CORNERING LIGHT ON THE LEFT (OR RIGHT)
SIDE INOPERATIVE
IS THE CORNERING LIGHT BULB ON THE LEFT (OR RIGHT) SIDE NORMAL?
I
I
I
YES
I NO I
I I
REMOVE THE CORNERING LIGHT SW (COMBINATION SW) REPLACE THE BULB 1 IS THERE CONTINUITY BElWEEN THE SW CONNECTOR
11 ~B-121 AND 9 li-12j
1(WHEN
TURNING LEFT),
AND 11 B-12 AND 10 B-12 (WHEN TURNING RIGHT)?
I
I I
YES
I NO l
I I
IS
THERE CONTINUITY BElWEEN THE~NERING !LIGHT REPAIR OR REPLACE
THE CORNERING LIGHT SW
SW HARNESS SIDE CONNECTORS 9 B-12 AND 4 C-22 (COMBINATION
SW) (THE LEFT SIDE CORNERING LIGHT CONNECTOR) OR 10 I B-12j AND 4 j C-31j (THE RIGHT SIDE CORNERING LIGHT CONNEC-
TORI?
I
I I
YES
I NO I
I I
REPAIR A POOR CONNECTION OF THE CONNECTORS OR REPAIR A POOR CONNECTION AT THE CONNECTORS
AN OPEN CIRCUIT BElWEEN THE CONNECTORS 1 jC-22j OR AN OPEN CIRCUIT BElWEEN THE CONNECTORS
AND 5 IC-161 OR 1 I C-311 AND 5 IC-161 9 I B-121 AND 4 I C-221 OR 1 0 I B-121 AND 4 I C-311
1-5 CORNERING LIGHT REMAINS ON
REPAIR OR REPLACE THE CORNERING LIGHT SW
(COMBINATION SW)

-
8-116 CHASSIS ELECTRICAL
2-1 BOTH BACKUP LIGHTS INOPERATIVE
• IS FUSE C-3 (15A) NORMAL? I
I
I
YES I
I
• IS ~GROUNDED SECURELY? I
I
I
YES I
I
• TURN THE STARTER SW ON
• IS THE BATIERY VOLTAGE APPLIED BETWEEN THE
MODE
SW lOR BACKUP LIGHT SW) HARNESS SIDE coNNECTOR 5 I C-431 11 I M-al >AND THE GROUND?
I
I
YES .J
I
• SET THE TRANSMISSION GEAR TO THE REVERSE POSITION
• WITH
THE MODE SW !OR BACKUP LIGHT SW) CONNECTOR
DISCONNECTED, IS THERE CONTINUITY BETWEEN SWITCH
SIDE
coNNECTORS 2 lc-431 AND 5 I C-431 11 I M-al AND 1 IM-91 )?
I
J
YES I
I
REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 2 I C-431 ( 1 I M-91 ) AND 9 I H-321
I
NO j
I
REPLACE THE FUSE j
I
NO I
I
GROUND IT SECURELY I
I
NO I
I
REPAIR AN POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN THE FUSE C-3 15A)
AND 5 lc-431 !OR 1 I M-al 1
I
NO I
I
REPAIR OR REPLACE THE MODE SW (BACKUP LIGHTSW)
NOTE: Connectors in parenthesis "( )" indicates the model with manual transmission.
..

• •
CHASSIS ELECTRICAL 8 -117
2-2 BACKUP LIGHT ON THE LEFT (OR RIGHT)
SIDE INOPERATIVE
IS THE BACKUP LIGHT BULB ON THE LEFT (OR RIGHT) SIDE NORMAL?
I
I I
YES I NO I
I I
IS THERE CONTINUITY BETWEEN THE BACKUP LIGHT REPLACE THE BULB J HARNESS SIDE CONNECTOR 3 §] (31 R-9 I) AND 9 IH-321?
I
I I
YES j NO I
I I
REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN REPAIR A POOR CONNECTION AT THE CONNECTORS
OPEN CIRCUIT BETWEEN BACKUP LIGHT HARNESS SIDE OR AN OPEN CIRCUIT IN THE CIRCUIT
CONNECTOR 1 [friJ (1 ~)AND [R±J
NOTE: Connector in parenthesis "( )" indicate a check point of the right side backup light.
2-3 BACKUP LIGHTS REMAIN ON
REPAIR OR REPLACE THE MODE SW (BACKUP LIGHT SW)

8-118 CHASSIS ELECTRICAL
2-4 HORNS DO NOT SOUND
~ ''
• IS FUSE F-3 (15A) NORMAL? I
I
YES j NO I
I
• IS HORN BODY GROUNDED SECURELY? I I REPLACE THE FUSE I
I
YES I NO I
I
• DISCONNECT THE HORN RELAY CONNECTOR GROUND IT SECURELy I
• IS THE BATIERY VOLTAGE APPLIED BETWEEN 2 I X-8 I
AND THE GROUND?
I
YES I NO I
I
• IS THE HORN RELAY NORMAL? I REPAIR A POOR CONNECTION AT THE CONNE TORS OR AN OPEN CIRCUIT BETWEEN FUSE F-3 (15.4
AND 21 X-81
~
I
YES NO I
I
• DISCONNECT THE HORN SW CONNECTOR . REPLACE THE RELAY J
• IS THE BATIERY VOLTAGE APPLIED BETWEEN lu-101
AND THE GROUND?
I
YES I NO J
I
• IS THE HORN SW NORMAL? I REPAIR A POOR CONNECTION AT THE CONN~ ~RS OR AN OPEN CIRCUIT BETWEEN 11 X-8 I AND ~ 0
I
YES / NO /
I
REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN REPAIR OR REPLACE THE HORN SW
OPEN CIRCUIT BETWEEN 31 X-8 I AND 1IC-27l (11 C-281) (COMBINATION SW)
~
•

CHASSIS ELECTRICAL 8-119
2-5 HORNS DO NOT SHUT OFF
• IS THE HORN RELAY NORMAL? I
I
I I
YES [ NO l
I
I
• REMOVE THE HORN SW I REPLACE THE HORN RELAY I
• IS THE MOVABLE PORTION OF THE HORN SW ALWAYS OUT
OF CONTACT WITH THE GROUND BRACKET?
I
I I
YES I r NO l
l I
REPAIR A SHORT CIRCUIT BETWEEN HORN RELAY HARNESS I REPAIR OR REPLACE THE HORN SW I
SIDE coNNECTOR 1 I x-sl AND lu-1ol

8 -120 CHASSIS ELECTRICAL
STARTER SWITCH
Refer to "START AND CHARGING" in this section.
LIGHTING SWITCH (COMBINATION
SWITCH)
Refer to HEADLIGHT AND FOG LIGHT in this section.
TURN SIGNAL SWITCH/CORNE
LIGHT SWITCH (COMBIN
SWITCH)
~ INSPECTION
lNG
ION
Check the continuity between the term nals of
the turn signal/cornering light switch. Fig. 8-
140)
Repair or replace the switch when the r suit of
inspection is found abnormal.
position
When
turning left
When in straight
When
turning right Turn
signal
light
4 5 9
Fig. 8-140
B REMOVAL
AND INSTALLATION
D Refer to the removal and installation steps of the
t.::.l LIGHTING SWITCH (COMBINATION SWITCH) in
"HEADLIGHT AND FOG LIGHT" of this section.
•