Toyota 4Runner: Interior Light Auto Cut Circuit

Toyota 4Runner Service Manual / Vehicle Interior / Lighting (int) / Lighting System / Interior Light Auto Cut Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls operation of the DOME relay in order to supply power to the interior lights. When battery saving control operates while the interior lights are on, the main body ECU (multiplex network body ECU) opens the DOME relay to turn off the lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	CHECK SYMPTOMS

(a) Check symptoms.

Result

Result	Proceed to
All the interior lights that receive power via the DOME relay do not illuminate.	A
Battery saving function does not operate.	B

GO TO STEP 4

2.	INSPECT DOME RELAY

(a) Remove the DOME relay from the engine room relay block, junction block.

(b) Inspect the DOME relay (See page ).

REPLACE DOME RELAY

3.	CHECK HARNESS AND CONNECTOR (DOME FUSE - DOME RELAY)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
DOME relay terminal 5 - Body ground	Ignition switch off	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to DOME Relay)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	PERFORM ACTIVE TEST USING TECHSTREAM

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

HINT:

In the Active Test, check the interior light operating state.

Main Body

Tester Display	Test Part	Control Range	Diagnostic Note
Relay for Interior Light Auto Cut Function	DOME relay	ON/OFF	-

OK:

Battery saving control operates.

HINT:

In the Active Test, selecting the DOME relay ON or OFF turns the interior light on or off.
After turning the ignition switch to ON, proceed to the preceding screen of the active test screen with the Techstream and turn the ignition switch off, and perform the active test.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

5.	INSPECT DOME RELAY

(a) Remove the DOME relay from the engine room relay block, junction block.

(b) Inspect the DOME relay (See page ).

REPLACE DOME RELAY

6.	CHECK HARNESS AND CONNECTOR (DOME RELAY - MAIN BODY ECU, BODY GROUND)

(a) Remove the Main body ECU (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
DOME relay terminal 2 - F9-2 (DOMR)	Always	Below 1 Ω
DOME relay terminal 1 - Body ground	Always	Below 1 Ω
F9-2 (DOMR) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

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