Toyota Tundra Service Manual: Interior Light Circuit

Toyota Tundra Service Manual / Vehicle Interior / Lighting / Lighting System / Interior Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the following lights:

Roof console box (front interior light)
No. 1 room light assembly (rear interior light)
Foot light bulb (w/ Foot Light)
Transponder key coil (w/ Ignition Key Cylinder Light)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the bulbs for circuits related to this system before performing the following procedure.

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Using the Techstream, perform the Active Test.

Click here

Main Body

Tester Display	Test Part	Control Range	Diagnostic Note
Illuminated Entry System	Illumination	OFF or ON	Perform the Active Test when DOOR switch in the interior dome light switch assembly, roof console box assembly (front interior light) and No. 1 room light assembly (rear interior light) turned on.

OK:

All of the interior lights turn on when ON is selected.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - INTERIOR DOME LIGHT SWITCH ASSEMBLY)

*1: w/ Transponder Key Light
*2: w/ Foot Light

(a) Disconnect the 3I driver side junction block assembly connector.

(b) Disconnect the J132 interior dome light switch assembly connector.

(d) Disconnect the J51 foot light bulb connector.*2

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3I-29 - J132-6 (FCTY)	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY

(a) Remove the driver side junction block assembly.

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

(b) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

Click here

Standard Resistance:

Tester Connection	Condition	Specified Condition
3I-29 - A-1 (ILE)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY

Interior Light Auto Cut Circuit

Operation Check

See More:

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