The following electrical system and wiring harness diagram manual apply for Toyota Camry 2004 model year including SXV10 and MCV10 Series. 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 Points section). See the System Outline to understand the circuit operation.
This manual is divided into sections which are Index and Introduction, How to Use This Manual, Troubleshooting (describes the basic inspection procedures for electrical circuits), Abbreviations, Glossary of Terms and Symbols, Relay Locations (shows position of the Electronic Control Unit, Relays, Relay Block, etc. This section is closely related to the system circuit), Electrical Wiring Routing (describes position of Parts Connectors, Splice points, Ground points, etc; This section is closely related to the system circuit), Power Source, Index and System Circuit (electrical circuits of each system are shown from the power supply through
ground points), Ground Points, and Overall Wiring Diagram.