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- Power switch off
- Electrical key transmitter sub-assembly brought outside vehicle
- All doors locked
- Electrical key transmitter sub-assembly not near the vehicle
- Driver door unlock sensor touched
Lexus NX: Driver Side Door Entry Unlock Function does not Operate
Lexus NX Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Entry Function) / Driver Side Door Entry Unlock Function does not Operate
DESCRIPTION
If the entry unlock function does not operate for the driver door only, but the entry lock function operates, the request code is being transmitted properly from the driver door. In this case, there may be a problem related to the unlock sensor (connection between the certification ECU (smart key ECU assembly) and front door outside handle assembly (for driver door)).
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
-
The smart access system with push-button start (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart access system with push-button start (for Entry Function) after confirming that the communication systems are functioning properly.
Click here
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- When using the Techstream with the power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
- Check that there are no electrical key transmitter sub-assemblies in the vehicle.
-
Before replacing the certification ECU (smart key ECU assembly), refer to smart access system with push-button start (for Entry Function) Precaution.
Click here
- After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
| 1. | CHECK POWER DOOR LOCK CONTROL SYSTEM |
(a) When the door control switch on the multiplex network master switch assembly is operated, check that the doors unlock and lock according to the switch operation.
Click here
OK:
Door locks operate normally.
| NG | .gif) | GO TO POWER DOOR LOCK CONTROL SYSTEM |
|
| 2. | READ VALUE USING TECHSTREAM (FL DOOR LOCK POS) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(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 |
|---|---|---|---|---|
| FL Door Lock Pos | Front door LH unlock detection switch signal | UNLOCK or LOCK | UNLOCK: Front door LH unlocked LOCK: Front door LH locked | - |
| Tester Display |
|---|
| FL Door Lock Pos |
OK:
The Techstream display changes correctly in response to the lock/unlock operation of the driver door.
| NG | | GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit) |
|
| 3. | READ VALUE USING TECHSTREAM (D-DOOR TOUCH SENSOR) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG)
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Smart Access / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Smart Access > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| D-Door Touch Sensor | Driver door touch sensor (unlock sensor) | ON or OFF | ON: Driver door touch sensor (unlock sensor) touched OFF: Driver door touch sensor (unlock sensor) not touched |
|
| Tester Display |
|---|
| D-Door Touch Sensor |
OK:
The Techstream display changes correctly in response to the operation of the front door outside handle assembly (for driver door).
| OK | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
| 4. | CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR)) |
(a) Disconnect the I53 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the M4 front door outside handle assembly (for driver door) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I53-4 (CLG1) - M4-4 (ANT1) | Always | Below 1 Ω |
| I53-3 (CG1B) - M4-5 (ANT2) | Always | Below 1 Ω |
| I53-4 (CLG1) or M4-4 (ANT1) - Body ground | Always | 10 kΩ or higher |
| I53-3 (CG1B) or M4-5 (ANT2) - Body ground | Always | 10 kΩ or higher |
(d) Reconnect the M4 front door outside handle assembly (for driver door) connector.
(e) Reconnect the I53 certification ECU (smart key ECU assembly) connector.
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | CHECK FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR) (INPUT TO DRIVER DOOR UNLOCK SENSOR) |
| *a | Component with harness connected (Certification ECU (Smart Key ECU Assembly)) | *b | Waveform 1 |
| *c | Unlock sensor not touched | *d | Unlock sensor touched |
(a) Using an oscilloscope, check the waveform.
OK:
| Tester Connection | Condition | Tool Setting | Specified Condition |
|---|---|---|---|
| I53-4 (CLG1) - I53-11 (E) | Procedure: | 5 V/DIV., 50 ms/DIV. | Pulse generation (See waveform 1) |
| OK | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG | | REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR) |
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SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS (a) Interview the customer and confirm the problem. Click here
NEXT 3. CHECK DTC AND FREEZE FRAME DATA* (a)
Components
COMPONENTS ILLUSTRATION *1 DECK FLOOR BOX LH *2 NO. 3 DECK BOARD SUB-ASSEMBLY *3 REAR DECK FLOOR BOX *4 NEGATIVE AUXILIARY BATTERY TERMINAL N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 NO. 1 BLACK OUT TAPE LH *2 NO. 2 BLACK OUT TAPE LH *
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