Toyota 4Runner manuals

Toyota 4Runner: 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


B

GO TO STEP 4


A

2.

INSPECT DOME RELAY

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

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



NG

REPLACE DOME RELAY


OK

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)



NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

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.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

5.

INSPECT DOME RELAY

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

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



NG

REPLACE DOME RELAY


OK

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


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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