Toyota Tacoma 2015-2018 Service Manual: Front Fog Light Circuit

Toyota Tacoma 2015-2018 Service Manual / Lighting / Lighting System / Front Fog Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the front fog lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration (See page ).*1
- *1: w/ Smart Key System

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM (FRONT FOG LIGHT RELAY)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Main Body

Tester Display	Test Part	Control Range	Diagnostic Note
Front Fog Light Relay	Front Fog Light	ON/OFF	-

OK:

Front fog lights illuminate.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT FOG FR RELAY

(a) Remove the FOG FR relay from the engine room relay block.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 - 5	Battery voltage not applied to terminals 1 and 2	10 kΩ or higher
3 - 5	Battery voltage applied to terminals 1 and 2	Below 1 Ω

REPLACE FOG FR RELAY

3.	CHECK HARNESS AND CONNECTOR (BATTERY - FOG FR RELAY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
Relay terminal 1 - Body ground	Always	11 to 14 V
Relay terminal 3 - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (FOG FR RELAY - DRIVER SIDE JUNCTION BLOCK)

(a) Disconnect the 1F driver side junction block connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Relay terminal 2 - 1F-27	Always	Below 1 Ω
1F-27 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT DRIVER SIDE JUNCTION BLOCK

(a) Remove the driver side junction block.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1F-27 - MB-7 (FFOG)	Always	Below 1 Ω
1F-27 - Body ground	Always	10 kΩ or higher

Text in Illustration

*a	Component without harness connected (Driver Side Junction Block)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE DRIVER SIDE JUNCTION BLOCK

Door Courtesy Switch Circuit

DESCRIPTION The main body ECU (multiplex network Body ECU) receives a door open or closed signal from each door courtesy light switch. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: R ...

Hazard Warning Switch Circuit

DESCRIPTION The combination meter assembly receives information signals from the telltale light assembly (hazard warning signal switch). WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect ...

Other materials:

Washer Motor
Components COMPONENTS ILLUSTRATION On-vehicle Inspection ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY HINT: This check should be performed with the windshield washer motor and pump assembly installed to the windshield washer jar assembly. ...

Wireless Door Lock Buzzer
Components COMPONENTS ILLUSTRATION Removal REMOVAL PROCEDURE 1. REMOVE WIRELESS DOOR LOCK BUZZER (a) Disconnect the connector. (b) Using a clip remover, disengage the clamp to remove the wireless door lock buzzer. Installation ...

Touch Panel Switch does not Function
PROCEDURE 1. CHECK MULTI-DISPLAY (a) Check if there is any foreign matter caught between the display and exterior frame of the multi-display. OK: No foreign matter is caught between the display and exterior frame of the multi-display. HINT: If there is foreig ...