How to Use the Circuit Diagrams

HOW TO USE THE CIRCUIT DIAGRAMS

All of the information in this folder is intended for use with the Electrical Reference Library booklet.

The circuit diagrams tare presented with Power and Earth distribution first, followed by individual circuits for each electrical system on the car.

Power Distribution
The Power Distribution diagram Shows the connections from the battery to the engine and passenger compartment fuse boxes. It also shows the internal circuitry of the fuseboxes.







The fuse box details are followed by independent functionally specific circuits and then a Splices and centre taps section outlining the way in which internal harness splices and centre taps distribute power in the harnesses. This information should be used during diagnosis of electrical faults to check for symptoms in associated Circuits and narrow down the search area.

Earth Distribution
The ground distribution section comprises a number of Headers and Splices tables. These are used in a similar manner to those in Power Distribution; to narrow the search area by checking for fault symptoms in associated circuits.

Splices and centre taps
Header and splice tables present the joint(s) and wiring up to the first component. Splices are identified by a number with an alphabetical prefix and the wire colour.

The splice information shown individual system circuits is not complete. Always refer to the splice circuit for complete information on each splice.

Wire length (Power & Earth Distribution only)
The length of the wire in millimeters. This can be used to locate internal harness splices; look for the shortest wire between the joint and connector. For example, it can be seen that C574-4 is 150mm from joint A82.

Connectors

HEADER JOINT(K109)







Header joints are identified by their corresponding connector number with a numbered suffix to indicate the pin-out detail of the wire, i.e. C289-1 identifies connector 289, pin number 1. Wire insulation colour is identified in the normal way. Where wires have a predominant colour with a secondary colour stripe. the main COlour is identified first, i.e. LGS - Light Green with a Slate stripe.

Line Types







This means the wire connects to another circuit.







The cup and ball symbol indicates the male and female halves of connector.

A. Plug on lead (Flylead) wired directly to the component.
B. Connector plugs directly into component.

Components







The name or description of the component is shown. A dotted outline indicates that the component is not shown in its entirety.

Earth points







Earth points are identified with an eyelet symbol and a connector number, except where components are grounded through their fixings, when only the eyelet is shown.

Fuses and Diodes







Fusible links(A) and current rated fuses (B) are identified as shown.
The direction of the arrow in a Diode symbol (C) indicates the direction of current flow. The Zener diode(D) - prevents current flow until a precise voltage is reached.