Toyota Avalon Service & Repair Manual: Interior Light Circuit

DESCRIPTION

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

  • Map Light (Roof Console Box Sub-assembly)
  • Spot Light Assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here

HINT:

The DOME CUT relay supplies power to the interior lights. If all the lights that use power from the DOME CUT relay do not turn on, check the interior light auto cut circuit first.

Click here

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

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

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

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Illuminated Entry System

Turns on the lights that are controlled by the illuminated entry system*

OFF or ON

Perform the Active Test with the door linked switch of the map light (roof console box sub-assembly) on and switches of the spot light assembly LH and RH off.

  • *: Refer to System Description for the lights that are controlled by the illuminated entry system.

    Click here

Body Electrical > Main Body > Active Test

Tester Display

Illuminated Entry System

OK:

All lights that are controlled by the illuminated entry system come on.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT MAP LIGHT (ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Remove the map light (roof console box sub-assembly).

Click here

(b) Inspect the map light (roof console box sub-assembly).

Click here

NG

REPLACE MAP LIGHT (ROOF CONSOLE BOX SUB-ASSEMBLY)

OK

3.

INSPECT SPOT LIGHT ASSEMBLY

(a) Remove the spot light assembly.

Click here

(b) Inspect the spot light assembly.

Click here

NG

REPLACE SPOT LIGHT ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (MAP LIGHT (ROOF CONSOLE BOX SUB-ASSEMBLY) - SPOT LIGHT ASSEMBLY)

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

Standard Resistance:

w/o Sliding Roof

Tester Connection

Condition

Specified Condition

O9-10 (+B1) - O8-5 (B)

Always

Below 1 Ω

O9-2 (RLMP) - O8-2 (CTY)

Always

Below 1 Ω

O9-10 (+B1) or O8-5 (B) - Body ground

Always

10 kΩ or higher

O9-2 (RLMP) or O8-2 (CTY) - Body ground

Always

10 kΩ or higher

w/ Sliding Roof

Tester Connection

Condition

Specified Condition

O10-14 (+B1) - O8-5 (B)

Always

Below 1 Ω

O10-2 (RLMP) - O8-2 (CTY)

Always

Below 1 Ω

O10-14 (+B1) or O8-5 (B) - Body ground

Always

10 kΩ or higher

O10-2 (RLMP) or O8-2 (CTY) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - MAP LIGHT (ROOF CONSOLE BOX SUB-ASSEMBLY))

(a) Disconnect the 4D instrument panel junction block assembly connector.

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

Standard Resistance:

w/o Sliding Roof

Tester Connection

Condition

Specified Condition

4D-10 - O9-10 (+B1)

Always

Below 1 Ω

4D-29 - O9-1 (DOOR)

Always

Below 1 Ω

4D-10 or O9-10 (+B1) - Body ground

Always

10 kΩ or higher

4D-29 or O9-1 (DOOR) - Body ground

Always

10 kΩ or higher

w/ Sliding Roof

Tester Connection

Condition

Specified Condition

4D-10 - O10-14 (+B1)

Always

Below 1 Ω

4D-29 - O10-1 (DOOR)

Always

Below 1 Ω

4D-10 or O10-14 (+B1) - Body ground

Always

10 kΩ or higher

4D-29 or O10-1 (DOOR) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4D-29 - MB-1 (ILE)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    Interior Light Auto Cut Circuit

    Luggage Compartment Door Courtesy Switch Circuit

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