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.

Click here

  • *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.

(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

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.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT BACK DOOR LOCK ASSEMBLY

(a) Remove the back door lock assembly.

Click here

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

Click here

OK:

Back door lock assembly is normal.

NG

REPLACE BACK DOOR LOCK ASSEMBLY

OK

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
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here

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

Click here

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

*a

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
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    ACC Signal Circuit
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    Door Courtesy Switch Circuit
    DESCRIPTION The main body ECU (multiplex network body ECU) detects the condition of the door courtesy light switch assembly. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Before replacing th ...

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