Electrical Wiring Diagram Corolla 2004

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

Table of contents =

❂ HOW TO USE THIS MANUAL
❂ TROUBLESHOOTING
❂ ABBREVIATIONS
❂ GLOSSARY OF TERMS AND SYMBOLS
❂ RELAY LOCATIONS
❂ ELECTRICAL WIRING ROUTING
❂ SYSTEM CIRCUITS
❂ GROUND POINT
❂ POWER SOURCE
❂ CONNECTOR LIST
❂ PART NUMBER OF CONNECTORS
❂ OVERALL ELECTRICAL WIRING DIAGRAM

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, splice points, 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 at the end of this manual.

CIPTO SUWARNO