Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Door Courtesy Switch Circuit

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Lighting (int) / Lighting System(for Gasoline Model) / Front Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of the front door courtesy light switch assembly.

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

FR Door Courtesy SW

Front door courtesy light switch assembly (for RH) signal

OFF or ON

OFF: Front door RH closed

ON: Front door RH open

-

FL Door Courtesy SW

Front door courtesy light switch assembly (for LH) signal

OFF or ON

OFF: Front door LH closed

ON: Front door LH open

-
Body Electrical > Main Body > Data List

Tester Display

FR Door Courtesy SW

FL Door Courtesy SW

OK:

Normal conditions listed above are displayed.

Result

Proceed to

OK

A

NG ("FR Door Courtesy SW" is not normal)

B

NG ("FL Door Courtesy SW" is not normal)

C
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

GO TO STEP 4

B

2.

INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH)

(a) Remove the front door courtesy light switch assembly (for RH).

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(b) Inspect the front door courtesy light switch assembly (for RH).

Click here

NG

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH)

OK

3.

CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(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

K6-1 - G33-6 (FRCY)

Always

Below 1 Ω

K6-1 or G33-6 (FRCY) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH)

(a) Remove the front door courtesy light switch assembly (for LH).

Click here

(b) Inspect the front door courtesy light switch assembly (for LH).

Click here

NG

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH)

OK

5.

CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(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

K7-1 - G33-1 (FLCY)

Always

Below 1 Ω

K7-1 or G33-1 (FLCY) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Engine Switch Illumination Circuit

    How To Proceed With Troubleshooting

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