Lexus NX: Jam Protection Function Activates During Power Back Door Operation
DESCRIPTION
When the jam protection function activates during power back door operation, one of the following may be the cause: 1) improper fit of back door, or a foreign object is stuck in the back door, 2) malfunctioning power back door sensor assembly circuit or 3) malfunctioning multiplex network door ECU.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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.
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PROCEDURE
| 1. | CHECK POWER BACK DOOR SYSTEM |
(a) Check if there are any foreign objects interfering with back door operation.
| Result | Proceed to |
|---|---|
| There are no foreign objects | A |
| There are foreign objects | B |
| B | .gif) | REMOVE FOREIGN OBJECT |
|
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| 2. | CHECK BACK DOOR OPERATION |
(a) Check back door operation.
(1) Turn the main switch so that it is not pushed.
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NOTICE:
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 OFF (initial setting is ON).
(2) Open/close the back door by hand.
| Result | Proceed to |
|---|---|
| The back door fully opens and closes smoothly | A |
| The back door does not fully open and close smoothly | B |
(b) Check main switch condition.
NOTICE:
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).
(1) Turn the main switch so that it is pushed.
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| B | | ADJUST BACK DOOR |
|
| 3. | READ VALUE USING TECHSTREAM |
(a) Check the Data List to determine if the power back door sensor assembly functions properly.
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| 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 |
| B | | GO TO STEP 6 |
| C | | GO TO STEP 8 |
|
| 4. | REPLACE POWER BACK DOOR UNIT ASSEMBLY SET (LH/RH) |
(a) Temporarily replace the power back door unit assembly set with a new or normally functioning one.
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|
| 5. | CHECK POWER BACK DOOR SYSTEM |
(a) Check power back door system operation.
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OK:
Power back door system operates normally
| OK | | END (POWER BACK DOOR UNIT ASSEMBLY SET WAS DEFECTIVE) |
| NG | | REPLACE MULTIPLEX NETWORK DOOR ECU |
| 6. | INSPECT POWER BACK DOOR SENSOR ASSEMBLY RH |
(a) Remove the power back door sensor assembly RH.
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(b) Inspect the power back door sensor assembly RH.
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| NG | | REPLACE POWER BACK DOOR SENSOR ASSEMBLY RH |
|
| 7. | 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 |
| 8. | INSPECT POWER BACK DOOR SENSOR ASSEMBLY LH |
(a) Remove the power back door sensor assembly LH.
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(b) Inspect the power back door sensor assembly LH.
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| NG | | REPLACE POWER BACK DOOR SENSOR ASSEMBLY LH |
|
| 9. | 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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