light ISUZU TF SERIES 2004 Owner's Guide

8A-28 ELECTRICAL-BODY AND CHASSIS

RELAY LOCATION (RELAY AND FUSE BOX)
RELAY & FUSE BOX
RHD





















NO. RELAY (C24SE) RELAY (6VE1) RELAY
(4JA1-TC/4JH1-TC)RELAY (4JA1-L)
X-1 RELAY; TAIL LIGHT
  
X-2 RELAY; FUEL PUMP
 RELAY; FRT FOG RELAY; FRT FOG
LIGHT
X-3 RELAY; HORN
  
X-4 RELAY; DIMMER
  
X-5 RELAY; FOG LIGHT
 RELAY; GLOW RELAY; GLOW
X-6 RELAY; STARTER
 RELAY; COND, FAN RELAY; CSD
X-7 RELAY; COND, FAN
 RELAY; RR FOG

X-8
  RELAY; STARTER RELAY; STARTER
X-9 RELAY; HAZARD-RH
  
X-10 RELAY; HAZARD-LH
  
X-11 RELAY; HEATER
  
X-12 RELAY; HEAD
LIGHT   
X-13
 RELAY; ECM MAIN
 RELAY; COND, FAN
X-14 RELAY; A/C COMP
  
X-15 RELAY; THERMO
  

ELECTRICAL-BODY AND CHASSIS 8A-29

RELAY LOCATION (RELAY AND FUSE BOX)
RELAY & FUSE BOX
LHD





















NO. RELAY (C24SE) RELAY (6VE1) RELAY
(4JA1-TC 4JH1-TC)RELAY (4JA1-L)
X-1 RELAY; TAIL LIGHT
  
X-2 RELAY; FUEL PUMP
 RELAY; FRT FOG RELAY; FRT FOG
LIGHT
X-3 RELAY; HORN
  
X-4 RELAY; DIMMER
  
X-5 RELAY; FRT FOG
LIGHT RELAY; FOG LIGHT RELAY; GLOW RELAY; GLOW
X-6 RELAY; STARTER
 RELAY; COND, FAN RELAY; CSD
X-7 RELAY; COND, FAN
 RELAY; RR FOG

X-8
  RELAY; STARTER

X-9
  SHORT
CONNECTOR
(with cooler) 
X-10
   
X-11 RELAY; HEATER
  
X-12 RELAY; HEAD
LIGHT   
X-13
 RELAY; ECM MAIN
 RELAY; COND, FAN
X-14 RELAY; A/C COMP
  
X-15 RELAY; THERMO
  

ELECTRICAL-BODY AND CHASSIS 8A-31
FUSE AND SLOW BLOW FUSE LOCATION (RELAY AND FUSE BOX)
RELAY & FUSE BOX
RHD

FUSE 
ENGINE MODEL
FUSE NO. C24SE 6VE1 4JA1-TC / 4JH1-TC4JA1-L
EB-1 15A ECM 20A ECM 10A ECM 
EB-2 
10A ECM (B) 10A RR FOG 
EB-3 15A FRT FOG
10A TCM 15A FRT FOG 
EB-4 10A ACG (S) 15A FRT FOG  10A ACG (S)
EB-5 10A ILLUMI  10A ILLUMI & TAIL-RH10A ILLUMI
EB-6 10A TAIL  10A TAIL-LH 10A TAIL
EB-7 10A H/LIGHT-RH  10A H/LIGHT RH-LOW10A H/LIGHT RH
EB-8 10A H/LIGHT-LH  10A H/LIGHT LH-LOW10A H/LIGHT LH
EB-9 20A FUEL PUMP 10A O2 SENSOR 10A TRA ILER 
EB-10 10A O2 SENSOR 20A FUEL PUMP 10A AC G (S) 
EB-11 
10A H/LIGHT RH-HIGH 
EB-12 
10A H/LIGHT LH-HIGH
EB-13 10A A/C 
 
EB-14 10A 4WD
10A 4WD  
EB-15 10A HORN   
EB-16 15A HAZARD 10A HAZARD  

SLOW BLOW FUSE
ENGINE MODEL
FUSE NO. C24SE 6VE1 4JA1-TC / 4JH1-TC4JA1-L
SBF-1 100A MAIN 
80A MAIN 
SBF-2  
20A COND, FAN 
SBF-3  
60A GLOW 20A COND, FAN
SBF-4 20A COND, FAN 
30A ECM 50A GLOW
SBF-5 40A IG 1   
SBF-6 
40A ABS-1  
SBF-7 
30A ABS-2  
SBF-8 30A BLOWER   
SBF-9 50A IG 2

8A-32 ELECTRICAL-BODY AND CHASSIS
FUSE AND SLOW BLOW FUSE LOCATION (RELAY AND FUSE BOX)
RELAY & FUSE BOX
LHD

FUSE  Saudi Arabia
ENGINE MODEL
FUSE NO. C24SE 6VE1 4JA1-TC / 4JH1-TC4JA1-L
EB-1 15A ECM 20A ECM 10A ECM 
EB-2 
10A ECM (B) 10A RR FOG 
EB-3 15A FRT FOG
10A TCM 15A FRT FOG 
EB-4 10A ACG (S) 15A FRT FOG  10A ACG (S)
EB-5 10A ILLUMI & TAIL-RH  10A ILLUMI & TAIL-RH 
EB-6 10A TAIL-LH  10A TAIL-LH

EB-7 10A H/LIGHT-RH 10A H/LIGHT-RH
10A H/LIGHT-RH-LOW
 10A H/LIGHT RH-LOW
10A H/LIGHT-RH-LOW
EB-8 10A H/LIGHT-LH 10A H/LIGHT-LH
10A H/LIGHT-LH-LOW
 10A H/LIGHT LH-LOW
10A H/LIGHT-LH-LOW
EB-9 20A FUEL PUMP 10A O2 SENSOR 10A TRA ILER 
EB-10 10A O2 SENSOR 20A FUEL PUMP 10A AC G (S) 
EB-11
10A H/LIGHT-RH-HIGH
10A H/LIGHT RH-HIGH 
EB-12 10A H/LIGHT-LH-HIGH
10A H/LIGHT LH-HIGH 
EB-13 10A A/C 
 
EB-14 10A 4WD
10A 4WD  
EB-15 10A HORN   
EB-16 15A HAZARD 10A HAZARD  
SLOW BLOW FUSE
ENGINE MODEL
FUSE NO. C24SE 6VE1 4JA1-TC / 4JH1-TC4JA1-L
SBF-1 100A MAIN 
80A MAIN 
SBF-2  
20A COND, FAN 
SBF-3  
60A GLOW 20A COND, FAN
SBF-4 20A COND, FAN 
30A ECM 50A GLOW
SBF-5 40A IG 1   
SBF-6 
40A ABS-1  
SBF-7 
30A ABS-2  
SBF-8 30A BLOWER   
SBF-9 50A IG 2

8A-114 ELECTRICAL-BODY AND CHASSIS
LIGHTING
PARTS LOCATION (RHD)







RTW48AXF014501 & RTW48AXF014601

8A-120 ELECTRICAL-BODY AND CHASSIS
TROUBLE SHOOTING
HEADLIGHT
1. Both the headlights (high and low beam) do not light

Checkpoint Trouble Cause Countermeasure


Repair the wiring

Poor ground point contact
NG

Repair open circuit or
connector contact


Repair open circuit


Repair or replace the
combination switch


Voltage between 1
B-60 -
ground


Open circuit between lighting
relay and lighting switch

Open circuit between battery
positive terminal and lighting
relay

Combination switch continuity

Poor switch contact or sw
faulty

Voltage between
5
X-12 - ground and
2
X-12 - ground


Reinstall or replace the
lighting relay

Lighting relay

Poor relay contact or relay
faulty

NG NG NG NG OK
OK
OK OK

Ground point contact (C-36)


Repair open circuit
Wiring continuity between

B-60 - C-36


Open circuit
NG OK

ELECTRICAL-BODY AND CHASSIS 8A-121
2. High or low beam does not light on both headlights

Checkpoint Trouble Cause Countermeasure


Repair or replace the
combination switch

Dimmer
passing switch
continuity

Poor switch contact or switch
faulty
NG

Repair open circuit or
connector contact
Voltage between
4
X-4 - ground and
4
B-60 - ground

Open circuit between
headlight and dimmer
passing
switch
NG OK



3. RH (or LH) high and low beam does not light



Replace the headlight bulb

Headlight connector continuity

Blown filament or air leakage
NG

Repair or replace the wire
and/or connector
Wiring continuity between
connector 3
C-19 - fuse No.
EB-7 or 3
C-26 fuse No.
EB-8

Open circuit and/or poor
connector contact
NG OK

Reinstall or replace fuse No.
EB-7 or No. EB-8
Fuse No. EB-7 (10A) or
No. EB-8 (10A) (Relay and
fuse box)
(No. EB-7 RH, No. EB-8: LH)
Poor installation or blown fuse
NG
OK



4. High or low beam does not light on one headlight (RH or LH)

Replace the headlight
assemblyHeadlight connector continuityBlown filament NG
Repair open circuit or
connector contactWiring continuity between
headlight and dimmer
passing
switchOpen circuit between
headlight and dimmer
passing
switch NG OK

8A-122 ELECTRICAL-BODY AND CHASSIS
5. Headlight does not go out

Checkpoint Trouble Cause Countermeasure


Replace the lighting relay
Lighting relay continuity
between connector 1
X-12
- 2
X-12 (Should be no
continuity)

Relay point fused
NG

Replay the combination switch
Lighting switch continuity
between connector 3
B-60
-1
B-60 when switch is
OFF(Should be no continuity)

point fused or faulty

NG
OK OK

Repair or replace the
combination switch
Dimmer
passing switch con-
tinuity between connector
3
B-60 - 1 B-60 when switch
is not operating
(Should be no continuity)

Switch point fused or faulty
NG
Repair short circuit
between 4
X-12 - 3 B-60
and 4
X-1 - 2 B-60
Check if headlight goes out
when connector
C-30 is
disconnected


Short circuit
NG OK



6. Insufficient headlight brightness



Replace the headlight bulb

Headlight bulb

Bulb filament faulty
NG

Repair the wiring
Dimmer
passing switch
Wire continuity between con-
nector 1
B-60 - C-36


Poor ground point contact
NG OK

Clean the light lens

Headlight lens

Lens dirty
NG
OK

ELECTRICAL-BODY AND CHASSIS 8A-123
7. Passing light does not function when dimmer switch is operated

Checkpoint Trouble Cause Countermeasure


Repair or replace the dimmer
switch

Dimmer switch

Poor switch point contact
NG

Repair open circuit between
4
X-12 - 3 B-60

Voltage between
3
B-60 - ground (Should
be battery voltage present)


Open circuit
NG OK



8. Headlight beam does not change when dimmer switch is operated

Repair or replace the dimmer
switchDimmer switchLoose beam lever or foreign
material in switch NG

8A-124 ELECTRICAL-BODY AND CHASSIS
TAIL LIGHT, LICENSE PLATE LIGHT, CLEARANCE LIGHT

1. All lights do not light

Checkpoint Trouble Cause Countermeasure



Repair or replace the
combination switch
Lighting switch continuity
between connector
2
B-60 - 1 B-60


Poor switch point or connector
contact
NG

Reinstall or replace the tail
relay

Tail relay


Poor relay contact or relay
faulty
NG OK

Reinstall or replace the fuse
No. EB-6

Fuse No. EB-6 (10A, Relay
and fuse box)

Poor fuse contact or blown
NG
OK



2. Tail light does not light


Replace the bulb or repair
connector contact

Tail light bulb continuity

Bulb burned out or poor
connector contact
NG

Repair open circuit or
connector contact
Continuity between connector
3
F-5 - 4 F-5 (RH)
or 3
F-6 - 4 F-6 (LH)


Open circuit or poor connector
contact
NG OK