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.

(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.

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.

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.

Click here

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

Click here

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

ACC Signal Circuit

DESCRIPTION This circuit detects the ignition switch ACC or off condition, and sends it to the main body ECU (multiplex network body ECU). WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: ...

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 ...

Other materials:

Toyota CH-R Service Manual > Air Conditioning System(for Automatic Air Conditioning System With Top-mounted Air Conditioner Pressure Sensor): Room Temperature Sensor Circuit (B1411)
DESCRIPTION The cooler thermistor (room temperature sensor) is installed in the instrument panel to detect the cabin temperature, which is used to control the air conditioning system. The resistance of the cooler thermistor (room temperature sensor) changes in accordance with the cabin temper ...

Toyota CH-R Service Manual > Power Steering System: On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. CHECK STEERING EFFORT (TORQUE) NOTICE: These service operations may affect the SRS airbags. Be sure to read the precautionary notices concerning the SRS airbag system before servicing. Click here (a) Stop the vehicle on a level, paved surface and alig ...

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

ACC Signal Circuit

Door Courtesy Switch Circuit

Other materials:

Toyota C-HR (AX20) 2023-2026 Owner's Manual

Toyota CH-R Owners Manual

Toyota CH-R Service Manual