Lexus NX manuals

Lexus NX: Rear Door LH Entry Lock and Unlock Functions do not Operate

Lexus NX Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Entry Function) / Rear Door LH Entry Lock and Unlock Functions do not Operate

DESCRIPTION

If the entry lock and unlock functions do not operate for the rear door LH only, the request code may not be being transmitted from the rear door LH or the rear door outside handle assembly LH (touch sensor) may be malfunctioning. If the entry functions for other doors operate properly, communication between the electrical key transmitter sub-assembly and door control receiver is normal. In this case, there may be a problem with request code transmission (communication between the certification ECU (smart key ECU assembly) and rear door outside handle assembly LH (electrical key antenna)), or there may be wave interference.

WIRING DIAGRAM

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

  • 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

GO TO POWER DOOR LOCK CONTROL SYSTEM

OK

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Access > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B
B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

3.

CHECK WAVE ENVIRONMENT

(a) Bring the electrical key transmitter sub-assembly approximately 0.3 m (0.984 ft.) from the rear door outside handle assembly LH and perform an entry function check.

Click here

  • Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the rear door outside handle assembly LH.
  • When the electrical key transmitter sub-assembly is brought near the rear door outside handle assembly LH, the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
  • If the inspection result is that the problem only occurs in certain locations or at certain times of day, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.
  • There may be wave interference if the vehicle is near broadcasting antennas, large video displays, wireless garage door opener systems, wireless security cameras, home security systems, etc. In this case, move the vehicle to a different location and check if there is any improvement.
  • If a tool for checking radio waves, such as a signal strength meter, is available, move around the area while observing both the LF band (used by the vehicle antenna to form the detection area) and RF band (used by the electrical key transmitter sub-assembly for transmission) to check for locations where there is wave interference.
  • When checking the operation of the entry lock function several times, it can be operated up to 2 times consecutively. To operate the function 3 times or more consecutively, the doors need to be unlocked once. However, this is only for the entry lock function, other door lock operations, such as a wireless door lock operation can be performed consecutively.

*a

Approximately 0.3 m (0.984 ft.)

Result

Proceed to

Entry function does not operate normally

A

Entry function operates normally

B
B

AFFECTED BY WAVE INTERFERENCE
A

4.

READ VALUE USING TECHSTREAM (DR-DOOR TOUCH SENSOR, DR-DOOR TRIGGER SWITCH)

(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

Dr-Door Touch Sensor

Rear door LH touch sensor (unlock sensor)

ON or OFF

ON: Rear door LH touch sensor (unlock sensor) touched

OFF: Rear door LH touch sensor (unlock sensor) not touched
  • Displays whether the unlock sensor is on or off (even if the sensor is touched and contact is maintained, "ON" is displayed only momentarily).
  • Use this Data List item to help determine if there is an unlock sensor malfunction when the entry unlock function does not operate.

Dr-Door Trigger Switch

Rear door LH touch sensor (lock sensor)

ON or OFF

ON: Rear door LH touch sensor (lock sensor) touched

OFF: Rear door LH touch sensor (lock sensor) not touched
  • Displays whether the lock sensor is on or off (even if the sensor is touched and contact is maintained, "ON" is displayed only momentarily).
  • Use this Data List item to help determine if there is a lock sensor malfunction when the entry lock function does not operate.
Body Electrical > Smart Access > Data List

Tester Display

Dr-Door Touch Sensor

Dr-Door Trigger Switch

HINT:

When checking the operation of the entry lock function several times, it can be operated up to 2 times consecutively. To operate the function 3 times or more consecutively, the doors need to be unlocked once. However, this is only for the entry lock function, other door lock operations, such as a wireless door lock operation can be performed consecutively.

OK:

The Techstream display changes correctly in response to the operation of the rear door outside handle assembly LH.

NG

GO TO STEP 6

OK

5.

CHECK KEY DIAGNOSTIC MODE

(a) Check the following antenna in key diagnostic mode.

Body Electrical > Smart Access > Utility

Tester Display

Communication Check(Key Diag Mode)

(b) Select either channel 1 or channel 2 and perform key diagnostic mode inspection for each channel.

(1) Check the electrical key antenna (for rear door LH):

When the electrical key transmitter sub-assembly is brought within 0.7 to 1 m (2.30 to 3.28 ft.) of the rear door outside handle assembly LH, check that the wireless buzzer sounds.

HINT:

  • Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel.
  • If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

*a

0.7 to 1 m (2.30 to 3.28 ft.)

Result

Proceed to

Wireless buzzer does not sound

A

Wireless buzzer sounds

B
B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

A

6.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - REAR DOOR OUTSIDE HANDLE ASSEMBLY LH)

(a) Disconnect the I52 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the O4 rear door outside handle assembly LH connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I52-8 (CLG3) - O4-4 (ANT1)

Always

Below 1 Ω

I52-7 (CG3B) - O4-5 (ANT2)

Always

Below 1 Ω

I52-8 (CLG3) or O4-4 (ANT1) - Body ground

Always

10 kΩ or higher

I52-7 (CG3B) or O4-5 (ANT2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO DRIVER DOOR ELECTRICAL KEY ANTENNA)

(a) Connect the I52 certification ECU (smart key ECU assembly) connector.

*a

Front view of wire harness connector

(to Rear Door Outside Handle Assembly LH)

*b

Waveform 1

(b) Measure the voltage according to the value(s) in the table below.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

O4-4 (ANT1) - O4-5 (ANT2)

Procedure:

  1. Power switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

5 V/DIV., 100 ms/DIV.

Pulse generation

(See waveform 1)

*: For details about the entry function detection area, refer to Operation Check.

Click here

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

8.

CHECK ENTRY LOCK OPERATION

(a) Connect all connectors and check that the entry lock and unlock functions operate.

Click here

Result

Proceed to

Entry function does not operate normally

A

Entry function operates normally

B
B

END (CONNECTOR WAS NOT CONNECTED SECURELY)
A

9.

REPLACE REAR DOOR OUTSIDE HANDLE ASSEMBLY LH

(a) Replace the rear door outside handle assembly LH with a new one or the rear door outside handle assembly RH if it is functioning properly.

Click here

NEXT

10.

CHECK ENTRY LOCK OPERATION

(a) Check that the entry lock and unlock functions operate.

Click here

Result

Proceed to

Entry function operates normally

A

Entry function does not operate normally

B
A

END (REAR DOOR OUTSIDE HANDLE ASSEMBLY LH WAS DEFECTIVE)
B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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