Lexus NX: Power Back Door cannot be Operated Using Any Switch
DESCRIPTION
When the power back door cannot be operated using any switch, one of the following may be the cause: 1) initialization of the multiplex network door ECU, 2) power back door sensor assembly circuit, 3) power back door ON/OFF signal circuit, 4) back door closer system, 5) meter / gauge system, 6) multiplex network door ECU power source circuit or 7) multiplex network door ECU.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this problem.
Click here
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- Inspect fuses for circuits related to this system before performing the following inspection procedure.
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This check is possible only when the "Power Back Door Function" customization setting using the multi-information display in the combination meter assembly is set to ON (initial setting is ON).
Click here
-
If the replacement, removal and installation of the multiplex network door ECU or disconnection of the connectors of the multiplex network door ECU has been performed, initialize the power back door system.
Click here
PROCEDURE
| 1. | INITIALIZE MULTIPLEX NETWORK DOOR ECU |
(a) Perform the initialization for the multiplex network door ECU.
Click here
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| 2. | CHECK POWER BACK DOOR SYSTEM |
(a) Check that the power back door hazard warning lights operate normally.
Click here
OK:
The power back door system operate normally
| OK | .gif) | END (POWER BACK DOOR SYSTEM HAS NOT BEEN INITIALIZED) |
|
| 3. | CHECK BACK DOOR CLOSER SYSTEM |
(a) Check back door closer system operation.
Click here
OK:
Back door closer system operates normally
| NG | | GO TO BACK DOOR CLOSER SYSTEM |
|
| 4. | CHECK COMBINATION METER ASSEMBLY |
(a) With the vehicle stopped and hybrid control system started, check the shift position indicator operation and that the speedometer indicates 0 km/h (0 mph).
OK:
Combination meter operates normally
| NG | | GO TO METER / GAUGE SYSTEM |
|
| 5. | CHECK FOR DTC |
(a) Check for DTCs.
Click here
OK:
DTC is not output
| NG | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
| 6. | CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - BATTERY AND BODY GROUND) |
| (a) Disconnect the multiplex network door ECU connectors. |
|
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Y27-10 (GND) - Body ground | Always | Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| Y26-20 (ECUB) - Body ground | Power switch off | 11 to 14 V |
| Y27-1 (B) - Body ground | Power switch off | 11 to 14 V |
| Y26-18 (IG) - Body ground | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 7. | READ VALUE USING TECHSTREAM |
(a) Read the Data List according to the display on the Techstream.
Click here
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| PBD Main SW | Power back door ON/OFF signal | ON or OFF | Current customize setting displayed | - |
| Tester Display |
|---|
| PBD Main SW |
OK:
On Techstream screen, item changes between ON and OFF according to above chart.
| NG | | GO TO METER / GAUGE SYSTEM |
|
| 8. | READ VALUE USING TECHSTREAM |
(a) Read the Data List according to the display on the Techstream.
Click here
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| PBD Touch Sensor (Right) | Power back door sensor assembly RH signal | ON, OFF or Open | ON: Power back door sensor assembly RH pressed OFF: Power back door sensor assembly RH not pressed Open: Power back door sensor assembly RH circuit open | - |
| PBD Touch Sensor (Left) | Power back door sensor assembly LH signal | ON, OFF or Open | ON: Power back door sensor assembly LH pressed OFF: Power back door sensor assembly LH not pressed Open: Power back door sensor assembly LH circuit open | - |
| Tester Display |
|---|
| PBD Touch Sensor (Right) |
| PBD Touch Sensor (Left) |
| Result | Proceed to |
|---|---|
| On the Techstream screen, ON or OFF is displayed accordingly | A |
| On the Techstream screen, ON or OFF is not displayed accordingly or Open is displayed for power back door sensor assembly RH | B |
| On the Techstream screen, ON or OFF is not displayed accordingly or Open is displayed for power back door sensor assembly LH | C |
| A | | REPLACE MULTIPLEX NETWORK DOOR ECU |
| C | | GO TO STEP 11 |
|
| 9. | INSPECT POWER BACK DOOR SENSOR ASSEMBLY RH |
(a) Remove the power back door sensor assembly RH.
Click here
(b) Inspect the power back door sensor assembly RH.
Click here
| NG | | REPLACE POWER BACK DOOR SENSOR ASSEMBLY RH |
|
| 10. | CHECK HARNESS AND CONNECTOR (POWER BACK DOOR SENSOR ASSEMBLY RH - MULTIPLEX NETWORK DOOR ECU) |
(a) Disconnect the Y8 power back door sensor assembly RH connector.
(b) Disconnect the Y26 multiplex network door ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Y8-1 (OSR) - Y26-6 (OSR) | Always | Below 1 Ω |
| Y8-2 (OSRE) - Y26-24 (OSE) | Always | Below 1 Ω |
| Y8-1 (OSR) or Y26-6 (OSR) - Body ground | Always | 10 kΩ or higher |
| Y8-2 (OSRE) or Y26-24 (OSE) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE MULTIPLEX NETWORK DOOR ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 11. | INSPECT POWER BACK DOOR SENSOR ASSEMBLY LH |
(a) Remove the power back door sensor assembly LH.
Click here
(b) Inspect the power back door sensor assembly LH.
Click here
| NG | | REPLACE POWER BACK DOOR SENSOR ASSEMBLY LH |
|
| 12. | CHECK HARNESS AND CONNECTOR (POWER BACK DOOR SENSOR ASSEMBLY LH - MULTIPLEX NETWORK DOOR ECU) |
(a) Disconnect the Y9 power back door sensor assembly LH connector.
(b) Disconnect the Y26 multiplex network door ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Y9-1 (OSL) - Y26-26 (OSL) | Always | Below 1 Ω |
| Y9-2 (OSLE) - Y26-24 (OSE) | Always | Below 1 Ω |
| Y9-1 (OSL) or Y26-26 (OSL) - Body ground | Always | 10 kΩ or higher |
| Y9-2 (OSLE) or Y26-24 (OSE) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE MULTIPLEX NETWORK DOOR ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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*: Use the Techstream.
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