Toyota CH-R Service Manual: 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
.gif)
- *: 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 |
| B | .gif) |
GO TO STEP 6 |
|
.gif)
|
2. |
INSPECT BACK DOOR LOCK ASSEMBLY |
(a) Remove the back door lock assembly.
Click here
(b) Inspect the back door lock assembly.
Click here
| NG | |
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 |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the instrument panel junction block assembly.
Click here
|
*a |
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.
(c) Measure the voltage according to the value(s) in the table below.
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 |
| NG | |
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.
| OK | |
END |
| NG | |
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.
| NG | |
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.
(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 Open |
Back door lock signal |
Prohibt or Permit |
Prohibt: Back door locked Permit: Back door unlocked |
- |
|
Tester Display |
|---|
|
Back Door Open |
OK:
On the Techstream screen, Prohibt or Permit is displayed accordingly.
| NG | |
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 |
- |
|
Tester Display |
|---|
|
Trunk and Back-Door Open |
OK:
The back door lock assembly operates normally.
| NG | |
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 |
|---|
|
Back Door Open Handle SW |
OK:
On the Techstream screen, ON or OFF is displayed accordingly.
| OK | |
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
| NG | |
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.
(c) Measure the resistance according to the value(s) in the table below.
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 |
| OK | |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG | |
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
| NG | |
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.
(c) 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 |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
14. |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the instrument panel junction block assembly.
Click here
|
*a |
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.
(c) Measure the resistance according to the value(s) in the table below.
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 |
| NG | |
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.
| OK | |
END |
| NG | |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
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Symptom
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INSPECTION
PROCEDURE
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(a) Check the resistance.
(1) Measure the resistance according to the value(s) in the table below.
*a
Component without harness connected
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*b
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Toyota CH-R Owners Manual
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