Understanding the Circuit Diagrams

Understanding the circuit diagrams






Connectors, Ground and Splices
Harnesses for the vehicle originate from a variety of different sources and therefore the connector nomenclature is inconsistent.

Wire Length
Wire length (where stated) is in millimeters and appear directly below the color code for each wire. Wire length values are displayed for LHD vehicles only, values for RHD vehicles may vary.

Twisted Wires
The 'figure-of-eight' symbol indicates that wires are twisted together.


By-pass Wires
Vehicles are customized to suit market or customer selected options. To reduce the number of circuits drawn, by-pass wires are shown. By-pass wires are identified by large, upper case letters designed to correspond with the alternative connection arrangement; refer to figure below.







Connector Designation

Certain connectors have been drawn for harness manufacturing purposes only. In Example 1, the left-hand connector is always used, the connector drawn to the right-hand side of the dotted line is a dummy connector which should be ignored; refer to Service Interpretation 1.






Example 2 depicts that some pairs of connectors have also been drawn for harness manufacturing purposes, these connectors do not appear in the vehicle and therefore should be ignored; refer to Service Interpretation 2.






Control Module Pins







Wire Codes







Option Code
A code identifying an optional wiring arrangement, for example BY1AD, may be allocated to certain wires; refer to the Option Code Table.

The asterisk (*) represents and ; the colon (:) represents or ; for example: DR_B*BY1AD, represents: left-hand drive AND heated & cooled seats IBYAD*IESAB:IBYAC*IESAB, represents: satellite digital audio AND television OR digital audio AND television.






Option Code Table











Component Depictions