How To Use This Information: Notes

This provides information on the electrical circuits installed on vehicles by dividing them into a circuit for each system.

The actual wiring of each system circuit is shown from the point where the power source is received from the battery as far as each ground point. (All circuit diagrams are shown with the switches in the OFF position.)

When troubleshooting any problem, first understand the operation of the circuit where the problem was detected (see OEM SYSTEM CIRCUITS article), the power source supplying power to that circuit (see POWER SOURCE article), and the ground points (see OEM GROUND POINTS article).

When the circuit operation is understood, begin troubleshooting of the problem circuit to isolate the cause. Use Relay Location and Electrical Wiring Routing articles to find each part, junction block and wiring harness connectors, wiring harness and wiring harness connectors and ground points of each system circuit. Internal wiring for each junction block is also provided for better understanding of connection within a junction block. Wiring related to each system is indicated in each system circuit by arrows (from__, to__). When overall connections are required, see the OVERALL ELECTRICAL WIRING DIAGRAM article.

Fig 1: Wire Harnesses Information (Example)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*The information in this article is about the wire harnesses. Information about component and assembly parts is for reference, but in some cases this reference information might not be included or might differ from the actual vehicle. When inspecting or repairing a vehicle, refer to the relevant article. .

* The system shown here is an EXAMPLE ONLY. It is different to the actual

Fig 2: Stop Light Electrical Circuit Diagram (Example)

Fig 3: Stop Light Electrical Circuit Diagram Legends