Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Back Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives a back door open/closed signal from the back door courtesy light switch (back door lock assembly).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*1

for HEV Model: Click here

for Gasoline Model: Click here

  • *1: w/ Smart Key System

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

Back Door Courtesy Switch Status

Back door courtesy switch signal

CLOSE or OPEN

CLOSE: Back door closed

OPEN: Back door open

-

Body Electrical > Main Body > Data List

Tester Display

Back Door Courtesy Switch Status

OK:

Normal conditions listed above are displayed.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY)

Click here

NG

REPLACE BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY)

OK

3.

CHECK HARNESS AND CONNECTOR (BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY) - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

(a) Disconnect the 8F power distribution box assembly connector.

(b) Disconnect the U42 multiplex network door ECU connector.*1

  • *1: w/ Power Back Door System

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

U4-3 (D+) - 8F-2

Always

Below 1 Ω

U4-2 (ACT-) - Body ground

Always

Below 1 Ω

U4-3 (D+) - Body ground

Always

10 kΩ or higher

8F-2 - 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

8F-2 - MB-19 (BCTY)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

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