Toyota Tacoma (2015-2018) Service Manual: Interior Light Auto Cut Circuit

Toyota Tacoma (2015-2018) Service Manual / Lighting / Lighting System / Interior Light Auto Cut Circuit

DESCRIPTION

When the battery saving control operates, the main body ECU (multiplex network body ECU) controls the operation of the DOME CUT relay, that is built in to the driver side junction block, to turn off the interior 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 (RELAY FOR INTERIOR LIGHT AUTO CUT FUNCTION)

(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
Relay for Interior Light Auto Cut Function	DOME CUT relay	ON/OFF	ON: DOME CUT relay off (interior lights turn off) OFF: DOME CUT relay on (interior lights turn on)

OK:

DOME CUT relay operates.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (DOME FUSE - DRIVER SIDE JUNCTION BLOCK)

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
1L-1 - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	REPLACE DRIVER SIDE JUNCTION BLOCK

(a) Replace the driver side junction block (See page ).

4.	PERFORM ACTIVE TEST USING TECHSTREAM (RELAY FOR INTERIOR LIGHT AUTO CUT FUNCTION)

(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
Relay for Interior Light Auto Cut Function	DOME CUT relay	ON/OFF	ON: DOME CUT relay off (interior lights turn off) OFF: DOME CUT relay on (interior lights turn on)

OK:

DOME CUT relay operates.

END (DRIVER SIDE JUNCTION BLOCK WAS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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Cautions & Notices
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