Toyota Avalon Service & Repair Manual: Ambient Light Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of the mood switch on the roof console box sub-assembly using this circuit.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

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PROCEDURE

1.

READ VALUE 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 / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Ceiling Light SW

Mood switch signal

OFF or ON

OFF: Mood switch not pressed

ON: Mood switch pressed

-

Body Electrical > Main Body > Data List

Tester Display

Ceiling Light SW

OK:

Normal conditions listed above are displayed.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT MOOD SWITCH (ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Remove the mood switch (roof console box sub-assembly).

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(b) Inspect the mood switch (roof console box sub-assembly).

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NG

REPLACE MOOD SWITCH (ROOF CONSOLE BOX SUB-ASSEMBLY)

OK

3.

CHECK HARNESS AND CONNECTOR (MOOD SWITCH (ROOF CONSOLE BOX SUB-ASSEMBLY) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the G33 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O10-27 (+B2) - G33-14 (ILSW)

Always

Below 1 Ω

O10-27 (+B2) or G33-14 (ILSW) - Body ground

Always

10 kΩ or higher

O10-15 (GND) - Body ground

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Ambient Illumination Light Circuit

    Customize Parameters

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