This is the original OEM EWD (Electrical Wiring Diagrams) manual for the 2009 Volvo XC90 in a simple PDF file format. It is the same manual that your local Volvo dealer technicians use to diagnose and repair your car.
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.
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DOWNLOAD: 2009 Volvo XC90 Electrical Wiring Diagrams
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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.