Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1165

ELECTRICAL-BODY AND CHASSIS  8-1 

SECTION 8 

ELECTRICAL-BODY AND CHASSIS 

TABLE OF CONTENTS 

PAGE 

General Information ..........................................................................................................8- 3 

Notes for Working on Electrical Items  .......................................................................8- 

4 

Symbols and Abbreviations  ........................................................................................8-  10 

Symbols ..................................................................................................................8-  10 
Abbreviations .........................................................................................................8-  11 

Parts for Electrical Circuit  ...........................................................................................8-  12 

Wiring ......................................................................................................................8- 12 
Fuse .........................................................................................................................8- 14 
Fusible Link  ............................................................................................................8-  14 
Circuit Breaker  .......................................................................................................8-  15 
Relay ........................................................................................................................8- 15 
Diode .......................................................................................................................8- 16 
Connector ...............................................................................................................8-  17 
Battery .....................................................................................................................8- 18 

Reading the Circuit Diagram .......................................................................................8-  21 

Main Data and Specifications  ..........................................................................................8-  23 

Bulb Specifications ......................................................................................................8-  23 
Relay and Fuse Box Location  .....................................................................................8-  25 
Relay Location-1 (Relay and Fuse Box)  .....................................................................8-  29 
Relay Location-2 (HEC Engine Model)  .......................................................................8-  30 
Relay Location-3 (4J Engine Model) ...........................................................................8-  31 
Relay Location-4 (6VD1 Engine Model) ......................................................................8-  32 
Fuse and Fusible Link Location (Relay and Fuse Box)  ............................................8-  33 
Fuse and Circuit Breaker Location (Fuse Box)  .........................................................8-  34 
Diode Location  .............................................................................................................8-  36 
Fuse Block Circuit-1  ....................................................................................................8-  37 
Fuse Block Circuit-2  ....................................................................................................8-  38 
Fuse Block Circuit-3  ....................................................................................................8-  39 

INDEX

8-2  ELECTRICAL-BODY AND CHASSIS 

PAGE 

Reference Table of Fuse, Fusible Link and Circuit Breaker .....................................8-  40 
Grounding Point ...........................................................................................................8-  43 

Reference Table  .....................................................................................................8-  43 
Location ..................................................................................................................8-  45 

Main Cable harness Routing ............................................................................................8-  48 
System Repair ...................................................................................................................8- 60 

Start and Charging .......................................................................................................8-  60 
Engine Control Module (ECM) and Fuel Pump  ..........................................................8-  73 
QOS/EGR/QWS .............................................................................................................8-  87 
Lighting .........................................................................................................................8- 93 
Rear Fog Light ..............................................................................................................8- 128 
HeadLight Leveling  ......................................................................................................8- 132 
Hazard Warning Flasher, Turn Signal Light, Back Up Light, 
Horn and Stop Light .....................................................................................................8- 136 
Dome Light, Spot Light and Warning Buzzer  ............................................................8- 167 
Windshield Wiper and Washer ....................................................................................8- 182 
Overdrive Off (A/T)  .......................................................................................................8- 202 
Transmission Control Module (TCM)  .........................................................................8- 205 
Meter, Warning Light and Indicator Light  ..................................................................8- 208 
Heater and Air Conditioning ........................................................................................8- 264 
Power Door Lock  .........................................................................................................8- 276 
Power Window  .............................................................................................................8- 287 
Audio, Clock and Cigarette Lighter  ............................................................................8- 309 
Power Door Mirror ........................................................................................................8- 317 
Rear Defogger  ..............................................................................................................8- 329 
Radiator Level Control Warning System ....................................................................8- 338 
SRS-Air Bag ..................................................................................................................8- 340 
Seat Heater  ...................................................................................................................8- 344 
Shift On the Fly .............................................................................................................8- 346 
Immobilizer ....................................................................................................................8- 354 

Connector List (HEC Engine Model)  ...............................................................................8- 358 
Connector List (6VD1 Engine Model) ..............................................................................8- 376 
Connector List (4J Engine Model) ...................................................................................8- 397 

 

ELECTRICAL-BODY AND CHASSIS  8-3 

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 
 

8-4  ELECTRICAL-BODY AND CHASSIS 

NOTES FOR WORKING ON ELECTRICAL ITEMS 

 

 
 

BATTERY CABLE 

Disconnecting the Battery Cable 
1.  All switches should be "OFF" position. 
2.  Disconnect the battery ground cable. 
3.  Disconnect the battery positive cable. 
CAUTION: 
It is important that the battery ground cable be 
disconnected first. 
Disconnecting the battery positive cable first can result in 
a short circuit. 
 

 
 

 

Connecting the Battery Cable 

Follow the disconnecting procedure in the reverse order to 
connect the battery cables. 
CAUTION: 
Clean the battery terminal and apply light coat of grease to 
prevent terminal corrosion. 
 

 

 
 

CONNECTOR HANDLING  

Disconnecting the Connectors 

Some connectors have a tang lock to hold the connectors 
together during vehicle operation. 
Some tang locks are released by pulling them towards you 

1

.

Other tang locks are released by pressing them forward 

2

. 

Determine which type of tang lock is on the connector being 
handled. 
 

 

 
 

Firmly grasp both sides (male and female) of the connector. 
Release the tang lock and carefully pull the two halves of the 
connector apart. 
Never pull on the wires to separate the connectors. 
This will result in wire breakage.