General

General

This is intended to assist in diagnosing electrical faults, and should be used in conjunction wish the Electrical Circuit Diagrams The document is divided into the following sections:
1. INTRODUCTION - includes Electrical Precautions, a list of Abbreviations and general information on how to use the document.
2. FUSE DETAILS - provides details of location, rating in Amperes and circuit(s) protected.
3. EARTH POINTS AND HEADERS - provides details of earth points, earth and power headers including a plan view of the vehicle to aid location.
4. DESCRIPTION AND OPERATION - provides an explanation of how each of the systems operates.
5. CONNECTOR DETAILS - details of connectors including a location photograph, face view and pin-out table.

NOTE: Before starting electrical checks on the vehicle ensure that the relevant mechanical functions operate satisfactory.

References
References to the LH or RH side given in this document are made when viewing the vehicle from the rear.

Operations covered in this document do not include reference to testing the vehicle after repair. It is essential that work is inspected and tested after completion and if necessary a road test of the vehicle undertaken particularly where safety related items are concerned.

CAUTION: Before undertaking any electrical work on a vehicle ALWAYS read the ELECTRICAL PRECAUTIONS.

Battery voltage
Before commencing diagnosis of electrical problems, verify the condition of the battery is acceptable by using the open circuit voltage test.

Open circuit voltage test
1. Switch off all electrical loads on the vehicle
2. Adjust digital multimeter to read dc volts on the appropriate scale.
3. Connect test probes across battery terminals ensuring that polarity is correct and record the voltage displayed.

A reading of 12.3 V or more is acceptable; any battery which reads less than this will need charging.

NOTE: If the vehicle has been used within a period of a hours prior to the test surface charge must be removed from the battery by switching the headlamps on for approximately 30 seconds. Wait a further 60 seconds before checking the open circuit voltage.

Battery voltage is used as a known reference for ascertaining whether or not circuits are receiving sufficiently high voltage for components to function correctly. This reference is only a guide since most electronic circuits are designed to function over a wide range of voltages. In addition, consideration must be given to readings affected by voltage drop across certain components and fluctuations due to cable lengths.