Toyota Tacoma 2003 Body Control System Parts Location Guide

A technical guide identifying the physical locations of body control system components, relays, and fuses for the 2003 Toyota Tacoma, including the Body ECU, junction blocks, and door lock assemblies.

Quick guide from the manual

This document provides a visual reference for the location of electrical components within the body control system of the 2003 Toyota Tacoma. It is intended for diagnostic and maintenance purposes to help identify where specific fuses, relays, and control modules are installed in the vehicle.

Component Locations

The body control system components are distributed throughout the vehicle. Key areas include:

Diagram showing the physical locations of body control system components in the 2003 Toyota Tacoma.

Engine Compartment (R/B No. 2): Contains the DOME, AM1, ALT, and J/B fuses, as well as the HEAD and TAIL relays.
Dashboard and Interior (J/B No. 1): Houses the Body ECU, ACC, ECU-IG, and POWER fuses, along with the PWR relay.
Dashboard and Steering Column: Contains the Combination Switch (Light Control Switch), Ignition Switch (Unlock Warning Switch), and J/B No. 3.
Doors and Cabin: Includes the Power Window Master Switch, Door Lock Control Switch, Door Lock Assemblies (with motors and switches), Door Courtesy Switches, and interior lighting components.
Other Locations: The Daytime Running Light Relay (Main) and Buckle Switch are located in the central console/dashboard area.

Manufacturer information

Toyota Motor Corporation

Brand profile

Manufacturer website https://www.toyota-global.com Support https://www.toyota.com/owners Manufacturer manuals https://www.toyota.com/owners/resources/manuals

Practical help

Common problems

Difficulty locating specific fuses or relays

Refer to the component map to identify if the part is in R/B No. 2 (engine bay), J/B No. 1 (interior), or J/B No. 3.

Identifying door lock system components

The door lock assembly, including the motor and detection switches, is located within the door panel structure.

Before use

Ensure the ignition is turned off before accessing any electrical components.
Verify the specific fuse or relay label matches the diagnostic requirement.
Use appropriate trim removal tools when accessing interior junction blocks to avoid damaging plastic panels.

Manual page author

Michael Turner

Technical manual editor

Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.