Symbols

The abbreviations and symbols explained here are used throughout the diagrams; it is necessary to know what they mean in order to use the diagrams effectively.

Symbols (Part 1 Of 5):

Symbols (Part 2 Of 5):

Symbols (Part 3 Of 5):

Symbols (Part 4 Of 5):

Symbols (Part 5 Of 5):

Terminal Number And Component Designation:

Terminal Designation
number
50 Battery voltage: Ignition Switch in position III
30 Battery voltage: supplied constantly
15 Battery voltage: Ignition Switch in position II or III
R Battery voltage: Ignition Switch in positions I, II
31 Ground
X Switched battery voltage through the ignition load relay or accessory relay; ignition switch is in position I or II.
49 Flasher unit input
49a Flasher unit output
50 Start
56 Headlamp
56a High beam
56b Low beam
56d Headlamp flash
58 Side lamps
85 End of relay coil
86 Start of relay coil
87 Relay contact
87a Relay contact

Previous and Next Arrows
A schematic diagram which follows another schematic diagram of the same chapter will have an arrow in the upper left hand corner. There is no arrow on the first schematic diagram of a chapter. Schematic diagrams which are followed by another schematic diagram will have an arrow in the lower right hand corner. If the diagram is the last diagram of the chapter, there will be a square instead of an arrow.

Diagram Qualifiers
Schematic diagrams which are specific to certain model, option or country variations will have a small "Qualifier" after the Previous Arrow in the upper left-hand corner. For example, a section might contain diagrams specific to petrol engines and some diagrams specific to diesel engines. "Petrol" will be shown in the upper left hand corner of petrol specific diagrams, and "Diesel" will be shown in the upper left hand corner of diesel specific diagrams.

Circuit Qualifiers
Certain abbreviations are used throughout the diagrams as circuit qualifiers. The following list explains all abbreviations used as qualifiers in the Circuit Diagrams.

ABS Anti-Lock Braking System
LHD Lefthand Drive
RHD Righthand Drive
LWB Long Wheel Base
SWB Short Wheel Base
NAS North American Countries
MFI-V8 Multiport Fuel Injection (MFI-V8)
MFI-T16 Multiport Fuel Injection (MFI-T16)
300 Tdi Tdi Diesel
300 Tdi with Tdi Diesel with Exhaust Gas EGR Recirculation (EGR)
300 Tdi without Tdi Diesel without Exhaust EGR Gas Recirculation (EGR)
300 Tdi with Tdi Diesel with Electronic
EDC Diesel Control (EDC)
300 Tdi without Tdi Diesel without Electronic Diesel Control (EDC)
EDC (applies to Tdi Diesels with and without EGR)
SFI-V8 Sequential Multiport Fuel Injection (SFI-V8)
A/C Air Conditioning
BBUS Battery Backed Up Alarm Sounder (Z272)

Switch Positions
Certain abbreviations are used throughout the diagrams as Switch Position notes. The following list explains all abbreviations used as Switch Position notes in the Circuit Diagrams.

< 100 ° Less than 100 °
> 100 ° More than 100 °

Connectors, Grounds, and Splices are identified by a letter followed by a number. Connectors are identified by C, grounds by E, and splices by S. Some splices are contained in junction connectors. These splices are identified by the prefix "HJ" below the splice's reference number. The number assigned to the connector, ground, or splice corresponds to its location in the vehicle.

Connector, Ground, and Splice Identification by Location:

Circuit Diagrams
- Circuit diagrams are arranged so that current flow is from the top of the diagram (current source) to the bottom of the diagram (ground).

- Only those components that work together in the circuit are shown. If only part of a component is used in the circuit, then only that part of the component is shown.

TERMINAL DESIGNATION
NUMBER
50 Battery voltage: Ignition Switch in position III
30 Battery voltage: supplied constantly
15 Battery voltage: Ignition Switch in position II or III
R Battery voltage: Ignition Switch in positions I, II
31 Ground

DIAGNOSIS
- Read the Circuit Operation before proceeding with the electrical diagnosis.
- Read the Troubleshooting Hints before performing the System Diagnosis.
- Tests follow the System Diagnosis
- When performing the System Diagnosis, be certain that all components disconnected in previous steps are reconnected unless otherwise directed.