Automotive / Parts & Accessories
Body Control System Parts Location Guide for 2003 Toyota Tacoma
Locate electrical components, fuses, relays, and switches in the 2003 Toyota Tacoma body control system with this parts location guide. Includes detailed diagrams for component identification.
Table of contents
Quick Guide to Body Control System Parts
This document provides a visual reference for the location of electrical components, relays, fuses, and switches within the 2003 Toyota Tacoma. Use this guide to identify where specific modules are installed during diagnostics or repair.
Electrical Distribution and Fuses
The vehicle contains several junction blocks (J/B) and relay blocks (R/B) housing critical fuses and relays. Ensure you identify the correct block before performing any electrical work.
- R/B No. 2: Contains DOME Fuse, AM1 Fuse, ALT Fuse, J/B Fuse, HEAD Relay, and TAIL Relay.
- J/B No. 1: Contains Body ECU, ACC Fuse, ECU-IG Fuse, POWER Fuse, and PWR Relay.
- J/B No. 3: Located near the dashboard and steering column area.
Switches and Control Modules
Various switches and control modules are distributed throughout the cabin and door assemblies. Key components include:
- Steering Column/Dashboard: Ignition Switch, Unlock Warning Switch, Combination Switch, and Light Control Switch.
- Door Assemblies: Power Window Master Switch, Door Lock Control Switch, and Door Lock Assembly (includes Door Lock Motor, Unlock Detection Switch, and Key Lock/Unlock Switch).
- Lighting: Personal Light, Interior Light, and Daytime Running Light Relay (Main).
- Other: Door Courtesy Switch, Buckle Switch, and DLC1 (Data Link Connector).
Manufacturer information
Toyota Motor Corporation
Practical help
Before use
- Verify the vehicle model year (2003 Toyota Tacoma).
- Ensure the ignition is off before accessing electrical components.
- Disconnect the negative battery terminal before handling fuses or ECUs to prevent short circuits.
- Consult the vehicle service manual for specific removal and installation procedures.
Images and diagrams
- The diagram illustrates the physical location of electrical components within the vehicle chassis.
- Components are grouped by their respective junction blocks (J/B) or relay blocks (R/B).
- Lines point from the component name to its approximate physical location in the vehicle.
Model compatibility
- This diagram is specific to the 2003 Toyota Tacoma (RM1002U).
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.