Toyota Yaris: Lighting System / Front Door Courtesy Switch Circuit

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Lighting (int) / Lighting System / 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.

Click here

PROCEDURE

1.

READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Door Courtesy Switch Status

Front door courtesy light switch assembly RH signal

CLOSE or OPEN

CLOSE: Front door RH closed

OPEN: Front door RH open

-

FL Door Courtesy Switch Status

Front door courtesy light switch assembly LH signal

CLOSE or OPEN

CLOSE: Front door LH closed

OPEN: Front door LH open

-

Body Electrical > Main Body > Data List

Tester Display

FR Door Courtesy Switch Status

FL Door Courtesy Switch Status

OK:

Normal conditions listed above are displayed.

Result

Proceed to

OK

A

NG ("FR Door Courtesy Switch Status" is not normal)

B

NG ("FL Door Courtesy Switch Status" is not normal)

C

A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

GO TO STEP 5

B

2.

INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (RH)

Click here

NG

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (RH)

OK

3.

CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (RH) - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the 4E power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O39-1(+) - 4E-3

Always

Below 1 Ω

O39-1(+) or 4E-3 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4E-3 - MB-2 (FLCY)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

5.

INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (LH)

Click here

NG

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH

OK

6.

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

(a) Disconnect the 4E power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O40-1(+) - 4E-5

Always

Below 1 Ω

O40-1(+) or 4E-5 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4E-5 - MB-4 (FRCY)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

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