Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: New Key cannot be Registered

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Entry Function) / New Key cannot be Registered

DESCRIPTION

If a new electrical key transmitter sub-assembly could not be registered, wave interference or a malfunction of the certification ECU (smart key ECU assembly), electrical key transmitter sub-assembly, ID code box (immobiliser code ECU), steering lock ECU (steering lock actuator or upper bracket assembly) or door control receiver assembly is suspected.

The registration procedure to add another electrical key transmitter sub-assembly (without replacing any parts) is called "additional key ID registration".

If additional registration is not possible, refer to Additional Key cannot be Registered.

Click here

HINT:

If any of the following have been performed, registration of all electrical key transmitter sub-assemblies is necessary:
  • The certification ECU (smart key ECU assembly) has been replaced.
  • The certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU) and steering lock ECU (steering lock actuator or upper bracket assembly) have been replaced.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If registration of an electrical key transmitter sub-assembly cannot be performed, confirm the procedure in Immobiliser System.

    Click here

  • New registration mode can be entered only when no electrical key transmitter sub-assemblies are stored in the certification ECU (smart key ECU assembly).
  • 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 engine 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 electrical key transmitter sub-assembly, certification ECU (smart key ECU assembly), Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly) or ID code box (immobiliser code ECU), refer to Precaution.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After repair, confirm that no DTCs are output.

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Access > Trouble Codes

NOTICE:

If a malfunction occurs, do not remove/install the vehicle battery before checking for DTCs.

OK:

DTCs are not output.

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART

OK

2.

READ VALUE USING TECHSTREAM (NUMBER OF REGISTERED KEY CODES)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine 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

Number of Registered Key Codes

Number of registered electrical key transmitter sub-assemblies

0 to 8

Number of registered electrical key transmitter sub-assemblies

Up to 7 electrical key transmitter sub-assemblies can be registered
Body Electrical > Smart Access > Data List

Tester Display

Number of Registered Key Codes

HINT:

A new certification ECU (smart key ECU assembly) will be have no electrical key transmitter sub-assemblies registered.

OK:

"0" is displayed on the Techstream display.

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

3.

READ VALUE USING TECHSTREAM (OPERATION HISTORY LIST)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Smart Access / Utility / Operation History / Certification ECU operation log of ID code registration.

Body Electrical > Smart Access > Utility

Tester Display

Operation History

(e) Check the freeze frame data.

Certification ECU operation log of ID code registration:

Parameter Name

Detection Condition

Trouble Area

Proceed to

Failed Registration Mode
  • A registration request was sent while in another mode.
  • During registration a different registration request was sent.

Certification ECU (smart key ECU assembly)

A

Vehicle ID not set

A vehicle ID has not been registered in the certification ECU (smart key ECU assembly).

Certification ECU (smart key ECU assembly)

B

Key Registration Max

A registration request is sent when the maximum number of electrical key transmitter sub-assemblies has already been registered.
  • Certification ECU (smart key ECU assembly)
  • ID code box (immobiliser code ECU)

C

ID-BOX Error

A registration request is sent even though whether the vehicle is provided with an ID code box is unknown.
  • Certification ECU (smart key ECU assembly)
  • ID code box (immobiliser code ECU)

D

Vehicle Speed Too High

(This applies only when registration fails even though the vehicle is stationary. Make sure that the vehicle is stationary first.)

A registration request is sent with a vehicle speed of 5 km/h or more.

Certification ECU (smart key ECU assembly)

E

No ECU Response

The steering lock ECU (steering lock actuator or upper bracket assembly) was not connected.
  • Certification ECU (smart key ECU assembly)
  • ID code box (immobiliser code ECU)
  • Steering lock ECU (steering lock actuator or upper bracket assembly)

F

L Code Verification Error

The L codes registered in the ID code box (immobiliser code ECU) and steering lock ECU (steering lock actuator or upper bracket assembly) did not match.
  • Certification ECU (smart key ECU assembly)
  • ID code box (immobiliser code ECU)
  • Steering lock ECU (steering lock actuator or upper bracket assembly)

G

L Code OK S Code NG

The L code verification was successful but the S code stored in the ID code box (immobiliser code ECU) and certification ECU (smart key ECU assembly) did not match.
  • Certification ECU (smart key ECU assembly)
  • ID code box (immobiliser code ECU)

C

Key Verification: Max Number

The number of electrical key transmitter sub-assemblies registered in the ID code box (immobiliser code ECU) was more than 7.

ID code box (immobiliser code ECU)

H

Key Verification: Amp Abnormal

Malfunction of the immobiliser amplifier, such as a short to ground.
  • Certification ECU (smart key ECU assembly)
  • Engine switch

I

Key Verification: Read Error

Although a registered electrical key transmitter sub-assembly was held near the engine switch, immobiliser system certification was not successful.
  • Certification ECU (smart key ECU assembly)
  • Electrical key transmitter sub-assembly

J

Unverified Key

Although all of the registered electrical key transmitter sub-assemblies had been held near the engine switch, electrical key transmitter sub-assembly registration was not possible due to immobiliser system certification not being successful.
  • Certification ECU (smart key ECU assembly)
  • Electrical key transmitter sub-assembly

K

Transponder Key Amp Error

Malfunction of the immobiliser amplifier, such as a short to ground.
  • Certification ECU (smart key ECU assembly)
  • Engine switch

I

New Key Registration Error

Although an unregistered electrical key transmitter sub-assembly was held near the engine switch, electrical key transmitter sub-assembly registration is not possible due to immobiliser system certification not being successful.
  • Certification ECU (smart key ECU assembly)
  • Electrical key transmitter sub-assembly

L

New Key Vehicle ID Error

Although an unregistered electrical key transmitter sub-assembly was held near the engine switch, electrical key transmitter sub-assembly registration is not possible due to the vehicle ID not being stored successfully.
  • Certification ECU (smart key ECU assembly)
  • Electrical key transmitter sub-assembly

L

New Key Registration Failed

After successful immobiliser system certification, time expired before smart recognition completion confirmation or a registration cancellation request was sent.
  • Certification ECU (smart key ECU assembly)
  • Electrical key transmitter sub-assembly

L

New Key Already Registered

Although a registered electrical key transmitter sub-assembly was held near the engine switch, time expired or a registration cancellation request was sent.

Certification ECU (smart key ECU assembly)

M

New Key ID Code Error

Electrical key transmitter sub-assembly registration was not possible due to the certification ECU (smart key ECU assembly) not being able to store the information of the electrical key transmitter sub-assembly to EEPROM correctly.

Certification ECU (smart key ECU assembly)

B

No Response Registering L/S Code

The certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly) was not connected.
  • Certification ECU (smart key ECU assembly)
  • ID code box (immobiliser code ECU)
  • Steering lock ECU (steering lock actuator or upper bracket assembly)

F

S Code Verification NG

The S code could not be stored by the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU).
  • Certification ECU (smart key ECU assembly)
  • ID code box (immobiliser code ECU)

C

L Code Verification NG

The L code could not be stored by the steering lock ECU (steering lock actuator or upper bracket assembly) or ID code box (immobiliser code ECU).
  • Certification ECU (smart key ECU assembly)
  • ID code box (immobiliser code ECU)
  • Steering lock ECU (steering lock actuator or upper bracket assembly)

G

ECU ID Verification Error

The code received from the ID code box (immobiliser code ECU) when the S code is registered does not match the code of the certification ECU (smart key ECU assembly).
  • Certification ECU (smart key ECU assembly)
  • ID code box (immobiliser code ECU)

C

Key Number Write Error

The certification ECU (smart key ECU assembly) could not store the number of electrical key transmitter sub-assemblies to EEPROM.

Certification ECU (smart key ECU assembly)

B

ID Code BOX Write Error

The certification ECU (smart key ECU assembly) could not store the information of whether the ID code box was provided in the vehicle to EEPROM.

Certification ECU (smart key ECU assembly)

B
B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

C

GO TO STEP 5

D

CHECK FOR DTC B2789

E

GO TO STEP 6

F

CHECK FOR DTC B2785

G

GO TO STEP 7

H

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

I

CHECK FOR DTC B278A or B2784

J

GO TO STEP 9

K

GO TO STEP 13

L

GO TO STEP 15

M

NEW KEY REGISTRATION FAILED, CHECK THE KEY
A

4.

CHECK REGISTRATION MODE

(a) Make sure that another mode or different registration mode is not selected.

OK:

Another mode or a different registration mode is not selected.

HINT:

If any mode has been selected, it is necessary to cancel the mode.

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

PERFORM REREGISTRATION

5.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Temporarily replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies.

HINT:

  • For replacement.

    Click here

  • For registration.

    Click here

OK:

All of the electrical key transmitter sub-assemblies could be registered to the new certification ECU (smart key ECU assembly) successfully.

OK

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)
NG

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

6.

READ VALUE USING TECHSTREAM (VEHICLE SPEED METER)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Vehicle Speed Meter

Vehicle speed

Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)

Almost the same as actual vehicle speed

-
Body Electrical > Combination Meter > Data List

Tester Display

Vehicle Speed Meter

OK:

"0 km/h (0 mph)" is displayed when the vehicle is stationary.

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

GO TO METER / GAUGE SYSTEM

7.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Temporarily replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies.

HINT:

  • For replacement.

    Click here

  • For registration.

    Click here

OK:

All of the electrical key transmitter sub-assemblies could be registered to the new certification ECU (smart key ECU assembly) successfully.

OK

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)
NG

8.

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

(a) Temporarily replace the steering lock ECU (steering lock actuator or upper bracket assembly) with a new one and register the electrical key transmitter sub-assemblies.

HINT:

  • For replacement.

    Click here

  • For registration.

    Click here

OK:

All of the electrical key transmitter sub-assemblies could be registered to the new steering lock ECU (steering lock actuator or upper bracket assembly) successfully.

OK

END (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) WAS DEFECTIVE)
NG

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

9.

CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

(a) Make sure that a registered electrical key transmitter sub-assembly is being used.

OK:

A registered electrical key transmitter sub-assembly is being used.

NG

USE A REGISTERED ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY AND PERFORM REREGISTRATION

OK

10.

CHECK NUMBER OF REGISTERED ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLIES

(a) Check the number of registered electrical key transmitter sub-assemblies.

Result

Proceed to

Only one electrical key transmitter sub-assembly is registered

A

2 or more electrical key transmitter sub-assemblies are registered

B
A

GO TO STEP 12

B

11.

REREGISTRATION

(a) Reregister the electrical key transmitter sub-assemblies using different order combinations.

Click here

HINT:

If there are 2 or more electrical key transmitter sub-assemblies, make sure that the number of order combinations is the same as the number of electrical key transmitter sub-assemblies so that each transmitter can be checked first.

Example: When there are 3 registered electrical key transmitter sub-assemblies (A, B and C).

Combination

Order*

1

A → B → C

2

B → C→ A

3

C → A → B
  • *: Except for the first electrical key transmitter sub-assembly, the remaining electrical key transmitter sub-assemblies can be checked in any order.

OK:

"Key Verification: Read Error" is not displayed.

OK

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY (ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY HELD WHEN "Key Verification: Read Error" WAS DETECTED WAS DEFECTIVE)
NG

12.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Temporarily replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies.

HINT:

  • For replacement.

    Click here

  • For registration.

    Click here

OK:

All of the electrical key transmitter sub-assemblies could be registered to the new certification ECU (smart key ECU assembly) successfully.

OK

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)
NG

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

13.

CHECK FOR ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

(a) Check that all registered electrical key transmitter sub-assemblies are available.

OK:

No registered electrical key transmitter sub-assemblies are missing.

NG

ERASE ALL REGISTERED ELECTRICAL KEY TRANSMITTERS EXCEPT ONE, THEN REGISTER THE REMAINING ELECTRICAL KEY TRANSMITTERS

OK

14.

REREGISTRATION

(a) Register the electrical key transmitter sub-assemblies using different order combinations.

Click here

HINT:

If there are 2 or more electrical key transmitter sub-assemblies, make sure that the number of order combinations is the same as the number of electrical key transmitter sub-assemblies so that each transmitter can be checked first.

Example: When there are 3 registered electrical key transmitter sub-assemblies (A, B and C).

Combination

Order*

1

A → B → C

2

B → C→ A

3

C → A → B
  • *: Except for the first electrical key transmitter sub-assembly, the remaining electrical key transmitter sub-assemblies can be checked in any order.

OK:

"Key Verification: Read Error" is not displayed.

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY (ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY HELD WHEN "Key Verification: Read Error" WAS DETECTED WAS DEFECTIVE)

15.

REREGISTRATION

(a) Using an unregistered electrical key transmitter sub-assembly, register the ID.

Click here

OK:

The key ID can be registered.

OK

END (ELECTRICAL KEY TRANSMITTER WAS DEFECTIVE)
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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