Lexus NX manuals

Lexus NX: Room Oscillator does not Recognize Key

Lexus NX Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Entry Function) / Room Oscillator does not Recognize Key

DESCRIPTION

If code verification cannot be performed in the vehicle interior, there may be problems with the communication between the vehicle (No. 1 indoor electrical key antenna assembly (front floor), No. 2 indoor electrical key antenna assembly (rear floor) or No. 3 indoor electrical key antenna assembly (inside luggage)) and electrical key transmitter sub-assembly, or the certification ECU (smart key ECU assembly) may be malfunctioning. When the electrical key transmitter sub-assembly is brought into the vehicle, verification of the key ID code transmitted from the electrical key transmitter sub-assembly and the key ID code stored in the certification ECU (smart key ECU assembly) is performed. If verification cannot be performed or the codes do not match, the power switch cannot be turned on (IG) and the hybrid control system cannot be started.

When a door is unlocked and the electrical key transmitter sub-assembly is brought into the vehicle, the certification ECU (smart key ECU assembly) activates the indoor electrical key antenna assembly which transmits radio waves to detect the electrical key transmitter sub-assembly. If the electrical key transmitter sub-assembly recognizes that it is in the detection area, it responds with the key ID code. This information is received by the indoor electrical key antenna and then sent to the certification ECU (smart key ECU assembly).

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.
  • 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".
  • The indoor electrical key antenna assemblies have an antenna coil between each terminal.
  • The door control receiver assembly is also related to interior verification.

PROCEDURE

1.

CHECK START OPERATION

(a) Using another registered electrical key transmitter sub-assembly, check that the hybrid control system starts.

Result

Proceed to

Hybrid control system can be started

A

Hybrid control system cannot be started

B
A

END (ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY WAS DEFECTIVE)
B

2.

CHECK ENTRY LOCK OPERATION

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

Click here

HINT:

If the door control receiver is defective, code verification does not begin in the cabin and the entry lock and unlock functions do not operate.

Result

Proceed to

All door entry functions operate normally (w/ Wireless Charging System)

A

All door entry functions operate normally (w/o Wireless Charging System)

B

All door entry functions does not operate normally

C
B

GO TO STEP 4

C

GO TO OTHER PROBLEM

A

3.

CHECK WIRELESS CHARGING SYSTEM

(a) Wireless charging system off.

Click here

(b) Check that interior certification is performed.

Click here

Result

Proceed to

Operate normally

A

Not operate normally

B
B

GO TO WIRELESS CHARGING SYSTEM

A

4.

CHECK PUSH-BUTTON START FUNCTION

(a) Remove the transmitter battery of the electrical key transmitter sub-assembly.

Click here

(b) With the brake pedal depressed, face the logo side of the electrical key transmitter sub-assembly towards the power switch, hold the transmitter near the power switch and then press the power switch.

*A

w/ Power Back Door System

*1

Power Switch

*2

Electrical Key Transmitter Sub-assembly

(c) When operating the power switch, check whether the hybrid control system starts.

HINT:

  • When the electrical key transmitter sub-assembly cannot be verified even though it is inside the detection area, the hybrid control system start check can be performed by removing the transmitter battery from the electrical key transmitter sub-assembly and holding the electrical key transmitter sub-assembly near the power switch.
  • If the hybrid control system cannot be started when performing this inspection, the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator assembly) may be malfunctioning.

Result

Proceed to

Hybrid control system can be started

A

Hybrid control system cannot be started

B
B

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (FOR START FUNCTION)

A

5.

CHECK WAVE ENVIRONMENT

(a) Install the transmitter battery to the electrical key transmitter sub-assembly.

Click here

(b) Bring the electrical key transmitter sub-assembly near the No. 1 indoor electrical key antenna assembly (front floor) and perform a smart access system with push-button start check.

Click here

NOTICE:

Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the No. 1 indoor electrical key antenna assembly (front floor).

Click here

(c) Bring the electrical key transmitter sub-assembly near the No. 2 indoor electrical key antenna assembly (rear floor) and perform a smart access system with push-button start check.

Click here

HINT:

Check that the customize status of the "Ignition Available Area" has been "All".

Click here

NOTICE:

Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the center of the No. 2 indoor electrical key antenna assembly (rear floor).

Click here

(d) Bring the electrical key transmitter sub-assembly near the No. 3 indoor electrical key antenna assembly (inside luggage) and perform a smart access system with push-button start check.

Click here

HINT:

Check that the customize status of the "Ignition Available Area" has been "All".

Click here

NOTICE:

Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the center of the No. 3 indoor electrical key antenna assembly (inside luggage).

Click here

HINT:

  • As the effect of wave interference decreases by moving the electrical key transmitter sub-assembly close to each indoor electrical key antenna assembly, it may be possible to check whether wave interference is the cause of the problem.
  • 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.

OK:

The hybrid control system starts when the electrical key transmitter sub-assembly is held near each indoor electrical key antenna assembly and the power switch is pressed.

OK

AFFECTED BY WAVE INTERFERENCE
NG

6.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Access > Trouble Codes

OK:

DTCs are not output.

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART

OK

7.

CHECK KEY DIAGNOSTIC MODE

(a) Check the following antennas 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 inspect key diagnostic mode for each channel.

(1) Check the No. 1 indoor electrical key antenna assembly (front floor):

When the electrical key transmitter sub-assembly is at either inspection point, 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

Inspection Point

(2) Check the No. 2 indoor electrical key antenna assembly (rear floor):

When the electrical key transmitter sub-assembly is at either inspection point, 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

Inspection Point

(3) Check the No. 3 indoor electrical key antenna assembly (inside luggage):

When the electrical key transmitter sub-assembly is at either inspection point, 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.
  • It is possible to check which indoor electrical key antenna assembly (front floor, rear floor or inside luggage) is operating by the sounding of the buzzer.
  • When the wireless buzzer sounds for all indoor electrical key antenna assemblies, they can be judged as operating properly and a malfunction in the certification ECU (smart key ECU assembly), which performs verification, is suspected.
  • When the wireless buzzer does not sound for all indoor electrical key antenna assemblies, it can be judged that the certification ECU (smart key ECU assembly), which controls the indoor electrical key antenna assemblies, is malfunctioning.

*a

Inspection Point

Result

Proceed to

The wireless buzzer sounds/does not sound for all indoor electrical key antenna assemblies

A

The wireless buzzer does not sound for only the No. 1 indoor electrical key antenna assembly (front floor)

B

The wireless buzzer does not sound for only the No. 2 indoor electrical key antenna assembly (rear floor)

C

The wireless buzzer does not sound for only the No. 3 indoor electrical key antenna assembly (inside luggage)

D
A

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

C

GO TO STEP 12

D

GO TO STEP 16

B

8.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR))

(a) Disconnect the I53 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the I27 No. 1 indoor electrical key antenna assembly (front floor) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I53-21 (CLG5) - I27-1 (ANTE5)

Always

Below 1 Ω

I53-20 (CG5B) - I27-3 (CLGB)

Always

Below 1 Ω

I53-21 (CLG5) or I27-1 (ANTE5) - Body ground

Always

10 kΩ or higher

I53-20 (CG5B) or I27-3 (CLGB) - Body ground

Always

10 kΩ or higher

(d) Reconnect the I53 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR))

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

I27-1 (ANTE5) - I27-3 (CLGB)

Procedure:

  1. Power switch off
  2. Electrical key transmitter sub-assembly not inside vehicle
  3. Within 30 seconds of closing any door using the door outside handle

2 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 1)

*a

Front view of wire harness connector

(to No. 1 indoor Electrical Key Antenna Assembly (Front Floor))

*b

Waveform 1

*c

For 30 seconds after closing any door using the door outside handle

*d

30 seconds or more have elapsed after closing any door using the door outside handle
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

10.

REPLACE NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR)

(a) Temporarily replace the No. 1 indoor electrical key antenna assembly (front floor) with a new one.

Click here

NEXT

11.

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 inspect key diagnostic mode for each channel.

(1) Check the No. 1 indoor electrical key antenna assembly (front floor):

When the electrical key transmitter sub-assembly is at either inspection point, 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.

OK:

Wireless buzzer sounds.

*a

Inspection Point
OK

END (NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR) WAS DEFECTIVE)
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

12.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR))

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

(b) Disconnect the I25 No. 2 indoor electrical key antenna assembly (rear floor) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I52-15 (CLG6) - I25-1 (ANTE6)

Always

Below 1 Ω

I52-14 (CG6B) - I25-3 (CLGB)

Always

Below 1 Ω

I52-15 (CLG6) or I25-1 (ANTE6) - Body ground

Always

10 kΩ or higher

I52-14 (CG6B) or I25-3 (CLGB) - Body ground

Always

10 kΩ or higher

(d) Reconnect the I52 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR))

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

I25-1 (ANTE6) - I25-3 (CLGB)

Procedure:

  1. Power switch off
  2. Electrical key transmitter sub-assembly not inside vehicle
  3. Within 30 seconds of closing any door using the door outside handle

2 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 1)

*a

Front view of wire harness connector

(to No. 2 Indoor Electrical Key Antenna Assembly (Rear Floor))

*b

Waveform 1

*c

For 30 seconds after closing any door using the door outside handle

*d

30 seconds or more have elapsed after closing any door using the door outside handle
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

14.

REPLACE NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR)

(a) Temporarily replace the No. 2 indoor electrical key antenna assembly (rear floor) with a new one.

Click here

NEXT

15.

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 inspect the diagnostic mode for each channel.

(1) Check the No. 2 indoor electrical key antenna assembly (rear floor):

When the electrical key transmitter sub-assembly is at either inspection point, 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.

OK:

Wireless buzzer sounds.

*a

Inspection Point
OK

END (NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR) WAS DEFECTIVE)
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

16.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE))

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

(b) Disconnect the P15 No. 3 indoor electrical key antenna assembly (inside luggage) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I52-4 (CLG7) - P15-1 (ANTE7)

Always

Below 1 Ω

I52-3 (CG7B) - P15-3 (CLGB)

Always

Below 1 Ω

I52-4 (CLG7) or P15-1 (ANTE7) - Body ground

Always

10 kΩ or higher

I52-3 (CG7B) or P15-3 (CLGB) - Body ground

Always

10 kΩ or higher

(d) Reconnect the I52 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

17.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE))

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

P15-1 (ANTE7) - P15-3 (CLGB)

Procedure:

  1. Power switch off
  2. Electrical key transmitter sub-assembly not inside vehicle
  3. Within 30 seconds of closing any door using the door outside handle

2 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 1)

*a

Front view of wire harness connector

(to No. 3 Indoor Electrical Key Antenna Assembly (Inside Luggage))

*b

Waveform 1

*c

For 30 seconds after closing any door using the door outside handle

*d

30 seconds or more have elapsed after closing any door using the door outside handle
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

18.

REPLACE NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE)

(a) Replace the No. 3 indoor electrical key antenna assembly (inside luggage).

Click here

NEXT

19.

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 inspect the diagnostic mode for each channel.

(1) Check the No. 3 indoor electrical key antenna assembly (inside luggage):

When the electrical key transmitter sub-assembly is at either inspection point, 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.

OK:

Wireless buzzer sounds.

*a

Inspection Point
OK

END (NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE) WAS DEFECTIVE)
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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