relay ISUZU TF SERIES 2004 User Guide

8A-2 ELECTRICAL-BODY AND CHASSIS
PAGE
Fuse and Slow Blow Fuse Location (Relay and Fuse Box) .................................... 8A- 31
Fuse Location ............................................................................................................. 8A- 33
Diode Location ........................................................................................................... 8A- 34
Fuse Block Circuit ...................................................................................................... 8A- 35
Fuse Block Circuit (C24SE) ....................................................................................... 8A- 35
Fuse Block Circuit (6VE1) ......................................................................................... 8A- 37
Fuse Block Circuit (4JA1-TC/4JH1-TC) - RHD ......................................................... 8A- 39
Fuse Block Circuit (4JA1-TC/4JH1-TC) – LHD ......................................................... 8A- 41
Fuse Block Circuit (4JH1-L) ...................................................................................... 8A- 43
Grounding Point ............................................................................................................. 8A- 45
Ground Point .............................................................................................................. 8A- 45
Ground Point Location .............................................................................................. 8A- 61
Main Cable harness Routing .......................................................................................... 8A- 63
C24SE / 6VE1 / 4JA1-L / 4JH1-TC .............................................................................. 8A- 63
Instrument Harness .................................................................................................... 8A- 71
System Repair .................................................................................................................8A- 73
Start and Charging ..................................................................................................... 8A- 73
Engine Control Module (ECM) ................................................................................... 8A- 89
Exhaust Gas Recalculation (EGR): 4JA1-L Only ...................................................... 8A- 109
Lighting ....................................................................................................................... 8A- 114
Front Fog Light ........................................................................................................... 8A- 136
Rear Fog Light ............................................................................................................ 8A- 144
Head Light Leveling ................................................................................................... 8A- 149
Illumination ................................................................................................................. 8A- 154
Hazard Warning Flasher, Turn Signal Light, Back Up Light,
Horn and Stop Light ................................................................................................. 8A- 161
Dome Light, Spot Light and Warning Buzzer .......................................................... 8A- 181
Windshield Wiper and Washer .................................................................................. 8A- 196
Transmission Control Module (TCM) ....................................................................... 8A- 214
Meter, Warning Light and Indicator Light ................................................................ 8A- 223
Heater and Air Conditioning ...................................................................................... 8A- 281
Power Door Lock ....................................................................................................... 8A- 293

8A-4 ELECTRICAL-BODY AND CHASSIS
GENERAL INFORMATION
The body and chassis electrical system operates on a twelve volt power supply with negative ground polarity.
The main harness consists of the engine harness, the instrument harness, the body harness, and the chassis
harness.
The harnesses use a split corrugated tube to protect the wires from the elements.
Wire size is determined by current flow, circuit length, and voltage drop.
All wires have color-coded insulation.
Wire color-codes are shown in the circuit diagrams.
This makes it easier to trace circuits and to make the proper connections.
Each circuit consists of the following:
1. Power source - The battery and the alternator
2. Wires - To carry electrical current through the circuit
3. Fuses - To protect the circuit against current overload
4. Relays - To protect voltage drop between the battery and the circuit parts and to protect the switch points against
burning
5. Switches - To open and close the circuit
6. Load - Any device, such as a light or motor, which converts the electrical current into useful work
7. Ground - To allow the current to flow back to the power source

ELECTRICAL-BODY AND CHASSIS 8A-11
SYMBOLS AND ABBREVIATIONS
SYMBOLS
Symbol Meaning of Symbol Symbol Meaning of Symbol


Fuse
Bulb



Fusible link
Double filament bulb



Fusible link wire
Motor


Switch
Variable resistor Rheostat


Switch
Coil (inductor), solenoid,
magnetic valve


Switch (Normal close type)





Contact wiring
Relay


Battery




Diode
Connector


Electronic Parts
Light emitting diode



Resistor
Reed switch


Speaker
Condenser



Buzzer
Horn


Circuit breaker
Vacuum switching valve

8A-16 ELECTRICAL-BODY AND CHASSIS


RELAY
Battery and load location may require that a switch be placed
some distance from either component.
This means a longer wire and a higher voltage drop
1. The
installation of a relay between the battery and the load reduces
the voltage drop
2.
Because the switch controls the relay, amperage through the
switch can be reduced.


Relay Specifications and Configurations
Name/
Color Rated
voltage/ Coil
resistance Internal circuit Name/
color Rated
Voltage/Coil
resistance Internal circuit
1T
(MICRO
ISO)
/Black 12V
Approx. 92
Minimum
operating
voltage: 7V at
20C (77F)

1M (MINI
ISO)
/Black 12V Approx.
94 Minimum
operating
voltage: 7V at
20C (77F)

1M
(MICRO
ISO)
/Black 12V
Approx. 132-3
 Minimum
operating
voltage: 7V at
20C (77F)

1M
(power)/
Black 12V Approx.
94 Minimum
operating
voltage: 7V at
20C (77F)

* Relay contact shown in the wiring diagram indicates condition before actuation.

8A-26 ELECTRICAL-BODY AND CHASSIS
RELAY AND FUSE
RELAY AND FUSE BOX LOCATION (RHD)

ELECTRICAL-BODY AND CHASSIS 8A-27

RELAY AND FUSE BOX LOCATION (LHD)











RTW48ALF000201

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
  

8A-30 ELECTRICAL-BODY AND CHASSIS
RELAY LOCATION


(CABIN)





RELAY
Connector No. B-7 B-8 B-40
C24SE
6VE1
4JA1-TC, 4JH1-TC
4JA1-L REAR DEFOGGER
POWER WINDOW ACC SOCKET

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