Toyota CH-R Service Manual: Back Door Courtesy Switch Circuit

Toyota CH-R Service Manual / Lighting (int) / Lighting System / Back Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (Multiplex Network Body ECU) receives a back door open/closed signal from back door lock assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

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*1: w/ Smart Key System

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to 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
Back Door Courtesy SW	Back door courtesy switch signal	ON or OFF	ON: Back door open OFF: Back door closed	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Back Door Courtesy SW

Back door courtesy switch signal

ON or OFF

ON: Back door open

OFF: Back door closed

Body Electrical > Main Body > Data List

Tester Display
Back Door Courtesy SW

OK:

Normal conditions listed above are displayed.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT BACK DOOR LOCK ASSEMBLY

(a) Remove the back door lock assembly.

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(b) Inspect the back door courtesy switch built in the back door lock assembly.

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OK:

Back door lock assembly is normal.

REPLACE BACK DOOR LOCK ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 3H instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
S9-3(D+) - 3H-34	Always	Below 1 Ω
S9-3(D+) or 3H-34 - Body ground	Always	10 kΩ or higher
S9-2(ACT-) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

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

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Component without harness connected

(Instrument Panel Junction Block Assembly)

Standard Resistance:

Tester Connection	Condition	Specified Condition
3H-34 - MB-4 (BCTY)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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Toyota CH-R Service Manual: Back Door Courtesy Switch Circuit

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