Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: New Key Registration Warning Message is not Displayed

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Entry Function) / New Key Registration Warning Message is not Displayed

DESCRIPTION

If the new key registration warning message is not displayed after an electrical key transmitter sub-assembly has been registered, there may be communication problem between the certification ECU (smart key ECU assembly) and combination meter assembly (meter ECU).

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.

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  • 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 certification ECU (smart key ECU assembly), refer to Precaution.

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  • After repair, confirm that no DTCs are output.

PROCEDURE

1.

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

2.

READ VALUE USING TECHSTREAM (FL DOOR COURTESY SWITCH)

(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 / 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 Courtesy SW

Front door LH courtesy light switch signal

ON or OFF

ON: Front door LH open

OFF: Front door LH closed

-
Body Electrical > Main Body > Data List

Tester Display

FL Door Courtesy SW

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.

B
B

GO TO LIGHTING SYSTEM

A

3.

CHECK WARNING

(a) With all of the doors closed, lock the doors using the entry lock function and check that the warning message is displayed on the multi-information display.

HINT:

Warning function (electrical key transmitter sub-assembly is locked inside the vehicle)

Click here

Result

Proceed to

The warning message is displayed on the multi-information display.

A

The warning message is not displayed on the multi-information display.

B
B

GO TO METER / GAUGE SYSTEM

A

4.

REGISTRATION

(a) Clear all of the registered electrical key transmitter sub-assemblies except one and perform registration again.

Click here

NEXT

5.

CHECK MULTI-INFORMATION DISPLAY

(a) With all of the doors closed, lock the doors using the entry lock function.

(b) Unlock the doors using the entry unlock function, open the driver door and check that the warning message is displayed on the multi-information display.

HINT:

Warning function (An electrical key transmitter sub-assembly has been registered)

Click here

Result

Proceed to

The warning message is displayed on the multi-information display.

A

The warning message is not displayed on the multi-information display.

B
A

END (10 DAYS MAY HAVE ELAPSED SINCE AN ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY WAS REGISTERED)
B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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