Additional Key cannot be Registered [10/2021 - 11/2023]: Procedure

1. Check for DTCs.

   Body Electrical > Smart Key > Trouble Codes 

   NOTE:

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

   OK

   DTCs are not output.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 11/2023] 

Result: 

OK 

See step  2

1. Read the Data List according to the display on the GTS.

   Body Electrical > Smart Key > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Unmatched Vehicle-ID	Key No. (incorrect or correct)	No or Yes	No: Communication normal Yes: Communication malfunction	The vehicle ID registered in the vehicle and the vehicle ID registered in the electrical key transmitter sub-assembly are different (if a key from another vehicle is brought into the vehicle exterior detection area while the doors are locked, "Yes" is displayed for "Unmatched Vehicle-ID" in the Data List). Other potential causes: An electrical key transmitter sub-assembly from a different vehicle is being used. A communication error due to wave interference. The electrical key transmitter sub-assembly or certification ECU (smart key ECU assembly) is malfunctioning.

   Body Electrical > Smart Key > Data List 

   Tester Display
   Unmatched Vehicle-ID

   Result

   Result	Proceed to
   "No" is displayed	A
   "Yes" is displayed	B

Result: 

B 

See step  4

Result: 

A 

See step  3

1. Remove the transmitter battery from the electrical key transmitter sub-assembly.
2. With the brake pedal depressed, hold the electrical key transmitter sub-assembly near the engine switch and check if the power source mode changes.

   OK

   The power source mode changes.

   HINT: 

   If the power source mode changes, the cabin verification is malfunctioning.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Engine Switch
   *2	Electrical Key Transmitter Sub-assembly

   Result

   Result	Proceed to
   The power source mode changes	A
   The power source mode does not change	B

Result: 

B 

GO TO SMART KEY SYSTEM (for Start Function) (Power Source Mode does not Change to ON (IG and ACC)). Refer to  Power Source Mode does not Change to ON (IG and ACC) [12/2019 - 10/2022]  , or refer to  Power Source Mode does not Change to ON (IG and ACC) [10/2022 - 11/2023]  

Result: 

A 

See step  4

1. Using an unregistered electrical key transmitter sub-assembly, perform the additional registration procedure.

   Refer to REGISTRATION [10/2021 - 10/2022] , or refer to REGISTRATION [10/2022 - 11/2023]

   OK

   Additional registration can be completed.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY (FIRST REGISTERED KEY WAS DEFECTIVE) 

Result: 

NG 

See step  5

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

   HINT: 

   • For replacement.

     Refer to REMOVAL [12/2019 - 11/2023]

   • For registration.

     Refer to REGISTRATION [10/2021 - 10/2022] , or refer to REGISTRATION [10/2022 - 11/2023]

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

GO TO OTHER PROBLEM (New key cannot be Registered). Refer to  New Key cannot be Registered [10/2021 - 10/2022]  , or refer to  New Key cannot be Registered [10/2022 - 11/2023]