Toyota Rear Fog Light System Wiring Diagram

System Overview

This document provides a detailed wiring diagram for the rear fog light system in Toyota vehicles. It illustrates the electrical connections between various components, including the Body ECU, relays, switches, and the rear fog lights themselves. The diagrams also detail connector pinouts and wire color codes for easy identification and troubleshooting.

Key Components and Connections

Page 1: Main Circuit and Body ECU Connections

This page shows the primary power distribution for the rear fog light system. Key components include:

BAT (Battery): Main power source.
ECU-B NO. 4 (25A): Fuse for the Body ECU.
IG1 NO. 4 (10A): Fuse for ignition power.
Body ECU (G27, G28): Central control unit for various vehicle functions, including lighting.
Engine Stop and Start ECU (G127): Manages the stop-start system.
No. 1 Junction Connector (A45, A46): Connects various circuits.
No. 19 Junction Connector (G59, G60): Further circuit connections.
Door Control Battery (N25): Power for door control systems.

Wire colors mentioned include B (Black), P (Pink), L (Blue), G (Green), R (Red), W-B (White-Black).

Page 2: Relay and Combination Meter Connections

This page details the relays and connections to the combination meter assembly:

Rear Fog Light Relay (FOG RR): Controls power to the rear fog lights.
TAIL Relay (TAIL): Controls tail lights.
Combination Meter Assembly (G10): Displays vehicle information, including warning lights.
Rear Combination Light Assembly RH/LH: Houses the rear fog light bulbs.
No. 47 Junction Connector (N28): Additional circuit connections.
No. 20 Junction Connector (G61): Further circuit connections.
No. 37 Junction Connector (G105): Additional circuit connections.

Wire colors include B (Black), W-B (White-Black), G (Green), L (Blue), P (Pink), R (Red).

Page 3: Light Control Switch and Body ECU

This page focuses on the light control switch and its interaction with the Body ECU:

Light Control Switch (G3): Allows the driver to activate tail lights and rear fog lights.
Headlight Dimmer Switch Assembly: Controls headlight functions.
Body ECU (G27, G28): Receives input from the switches.

The switch has positions for OFF, AUTO, Front Fog, Tail, and Headlights. The rear fog light (RFOG) is activated by the switch.

Wire colors include W-B (White-Black), P (Pink), GR (Gray), B (Black).

Pages 4-7: Connector Pinouts

These pages provide detailed diagrams of various connectors used in the system, including their part numbers and pin configurations. These are crucial for identifying specific wires and ensuring correct connections during repair or modification.

A45, A46: 12-pin connectors.
G9, G10, G27, G28: Various pin counts (e.g., 12-pin, 22-pin).
G59, G60, G61, G65, G98: Various pin counts (e.g., 14-pin, 22-pin).
N25, N28: Various pin counts (e.g., 12-pin, 26-pin).
01, 02: Gray connectors.
2D, 2G, 2J, 2L, 2Q: White connectors with varying pin counts.
AG1, AG6, GN1, GN2, GN4: White connectors with different pin configurations.
ON2: Black connectors.

Connector part numbers are provided, such as 90980-12737, 90980-12460, 90980-12554, 90980-12A46, 90980-11661, 90980-12854, 82824-52530, 82824-52520, 90980-12771, 90980-12770, 90980-11194, 90980-11193.

Notes and Conditions

The following notes apply to the wiring diagrams:

*1: w/ Stop & Start System
*2: w/o Stop & Start System
*3: w/ Door Control Battery
*4: w/o Door Control Battery
*5: w/ Front Fog Light
*6: w/ Automatic Light Control
*7: w/ Off Position
*8: 2KD-FTV, 1TR-FE, 2TR-FE engines
*9: 1GD-FTV, 2GD-FTV engines
*11: RHD 1GD-FTV, RHD 2GD-FTV
*12: LHD 1GD-FTV, LHD 2GD-FTV, 2KD-FTV, 1TR-FE, 2TR-FE engines

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