Toyota CH-R Service Manual: Only Back Door cannot be Opened

Toyota CH-R Service Manual / Door Lock / Power Door Lock Control System / Only Back Door cannot be Opened

DESCRIPTION

The main body ECU (multiplex network body ECU) receives signals from the back door opener switch assembly. When a signal received is the main body ECU (multiplex network body ECU) activates the back door lock motor.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration*.
Click here
- *: w/ Smart Key System
The power door lock control system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power door lock control system after confirming that the communication systems are functioning properly.*
Click here
- *: w/ Smart Key System
Before performing this troubleshooting procedure, perform troubleshooting for the smart access system with push-button start (for Entry Function) (Back Door Entry Unlock Function does not Operate) first.*
Click here
- *: w/ Smart Key System

PROCEDURE

1.	CONFIRM MODEL

(a) Choose the model to be inspected.

Result	Proceed to
w/ Smart Key System	A
w/o Smart Key System	B

GO TO STEP 6

2.	INSPECT BACK DOOR LOCK ASSEMBLY

(a) Remove the back door lock assembly.

Click here

(b) Inspect the back door lock assembly.

Click here

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
S9-1 (ACT+) - 3H-20	Always	Below 1 Ω
S9-3 (D+) - 3H-34	Always	Below 1 Ω
S9-2 (ACT-) - Body ground	Always	Below 1 Ω
S9-1 (ACT+) or 3H-20 - Body ground	Always	10 kΩ or higher
S9-3 (D+) or 3H-34 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here

Component without harness connected

(Instrument Panel Junction Block Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3H-20 - Body ground	Battery voltage not applied between 3K-1 and MB-6 (TR+)	Below 1 V
3H-20 - Body ground	Battery voltage applied between 3K-1 and MB-6 (TR+)	11 to 14 V

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

5.	CHECK BACK DOOR OPEN OPERATION

(a) Check that the back door can be opened.

OK:

The back door can be opened.

END

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

6.	CHECK POWER DOOR LOCK OPERATION (BASIC FUNCTION)

(a) Check the power door lock basic function.

OK:

The power door lock basic functions operate normally.

GO TO PROBLEM SYMPTOMS TABLE

7.	READ VALUE USING TECHSTREAM (Back Door Open)

(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 Open	Back door lock signal	Prohibt or Permit	Prohibt: Back door locked Permit: Back door unlocked	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Back Door Open

Back door lock signal

Prohibt or Permit

Prohibt: Back door locked

Permit: Back door unlocked

Body Electrical > Main Body > Data List

Tester Display
Back Door Open

OK:

On the Techstream screen, Prohibt or Permit is displayed accordingly.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

8.	PERFORM ACTIVE TEST USING TECHSTREAM (Trunk and Back-Door Open)

(a) Enter the following menus: Body Electrical / Main Body / Active Test.

(b) Perform the Active Test according to the display on the Techstream.

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Trunk and Back-Door Open	Back door lock motor	OFF/ON	-

Body Electrical > Main Body > Active Test

Tester Display
Trunk and Back-Door Open

OK:

The back door lock assembly operates normally.

GO TO STEP 12

9.	READ VALUE USING TECHSTREAM (Back Door Open Handle SW)

(a) Enter the following menus: Body Electrical / Main Body / Data List.

(b) 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 Open Handle SW	Back door opener switch signal	OFF or ON	OFF: Back door closed ON: Back door open	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Back Door Open Handle SW

Back door opener switch signal

OFF or ON

OFF: Back door closed

ON: Back door open

Body Electrical > Main Body > Data List

Tester Display
Back Door Open Handle SW

OK:

On the Techstream screen, ON or OFF is displayed accordingly.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

10.	INSPECT BACK DOOR OPENER SWITCH ASSEMBLY

(a) Remove the back door opener switch assembly.

Click here

(b) Inspect the back door opener switch assembly.

Click here

REPLACE BACK DOOR OPENER SWITCH ASSEMBLY

11.	CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the F15 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the S8 back door opener switch assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F15-18 (BDSU) - S8-3 (UL)	Always	Below 1 Ω
S8-2 (E) - Body ground	Always	Below 1 Ω
F15-18 (BDSU) or S8-3 (UL) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	INSPECT BACK DOOR LOCK ASSEMBLY

(a) Remove the back door lock assembly.

Click here

(b) Inspect the back door lock assembly.

Click here

REPLACE BACK DOOR LOCK ASSEMBLY

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

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

(b) Disconnect the S9 back door lock assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
S9-1 (ACT+) - 3H-20	Always	Below 1 Ω
S9-3 (D+) - 3H-34	Always	Below 1 Ω
S9-2 (ACT-) - Body ground	Always	Below 1 Ω
S9-1 (ACT+) or 3H-20 - Body ground	Always	10 kΩ or higher
S9-3 (D+) or 3H-34 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here

Component without harness connected

(Instrument Panel Junction Block Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3H-20 - Body ground	Battery voltage not applied between 3K-1 and MB-6 (TR+)	Below 1 V
3H-20 - Body ground	Battery voltage applied between 3K-1 and MB-6 (TR+)	11 to 14 V

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

15.	CHECK BACK DOOR OPEN OPERATION

(a) Check that the back door can be opened.

OK:

The back door can be opened.

END

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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