Toyota Prius 2003 Electrical Wiring Diagram

This wiring diagram manual has been prepared to provide information on the electrical system of the 2003 PRIUS. Applicable models: NHW11 Series. For service specifications and repair procedures of the above models other than those listed in this manual, refer to the following manuals.

Manual Name Pub. No.

  • 2003 PRIUS Repair Manual
  • Volume 1 RM957U1
  • Volume 2 RM957U2
  • 2003 TOYOTA New Car Features NCF228U

All information in this manual is based on the latest product information at the time of publication. However, specifications and procedures are subject to change without notice.


  • INDEX Index of the contents of this manual.
  • INTRODUCTION Brief explanation of each section.
  • HOW TO USE THIS MANUAL Instructions on how to use this manual.
  • TROUBLE± SHOOTING Describes the basic inspection procedures for electrical circuits.
  • ABBREVIATIONS Defines the abbreviations used in this manual.
  • GLOSSARY OF TERMS AND SYMBOLS Defines the symbols and functions of major parts.
  • 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.
  • INDEX Index of the system circuits.
  • SYSTEM CIRCUITS Electrical circuits of each system are shown from the power supply through ground points. Wiring connections and their positions are shown and classified by code according to the connection method. (Refer to the section, ’’How to use this manual”). The “System Outline” and ’’Service Hints” useful for troubleshooting are also contained in this section.
  • GROUND POINT Shows ground positions of all parts described in this manual.
  • POWER SOURCE (Current Flow Chart) Describes power distribution from the power supply to various electrical loads.
  • CONNECTOR LIST Describes the form of the connectors for the parts appeared in this book. This section is closely related to the system circuit.
  • PART NUMBER OF CONNECTORS Indicates the part number of the connectors used in this manual.
  • OVERALL ELECTRICAL WIRING DIAGRAM Provides circuit diagrams showing the circuit connections.

Language: English
Format: PDF
Pages: 309

Toyota Prius 2003 Electrical Wiring Diagram