This is the original OEM electrical wiring diagrams for the 2006 Toyota Highlander in a simple PDF file format that you can download for FREE.
HOW TO USE THIS MANUAL
This manual 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 System Circuit section), the power source supplying power to that circuit (see Power Source section), and the ground points (see Ground Point section). See the System Outline to understand the circuit operation.
When the circuit operation is understood, begin troubleshooting of the problem circuit to isolate the cause. Use Relay Location and Electrical Wiring Routing sections 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 a better understanding of the connection within a junction block.
Wiring related to the separate system is indicated in each system circuit by arrows (from___, to_). When overall connections are required, see the Overall Electrical Wiring Diagram at the end of the manual.
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CAUTION: Please note that this manual is made for the use of persons who have special techniques and certifications. If non-specialized or uncertified technicians perform repairs or service only using this manual or without proper equipment or tools, this may cause severe injury to you or other persons nearby and also cause damage to your vehicle. In order to prevent dangerous operations and damage to your vehicle, be sure to follow the instructions thoroughly.