DTC B2790-46: ID-BOX Calibration / Parameter Memory Failure [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
- REPLACE ID CODE BOX (IMMOBILIZER CODE ECU)
- Replace the ID code box (immobilizer code ECU) with a new one.
HINT:
Refer to REMOVAL [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]
Result
Proceed to NEXT
Result:
NEXT
See step 2
- Replace the ID code box (immobilizer code ECU) with a new one.
- CLEAR DTC
Result:
NEXT
See step 3
- REGISTER RECOGNITION CODE
- Register the recognition codes to the ECUs.
Refer to REGISTRATION [10/2022 - ]
Result
Proceed to NEXT
Result:
NEXT
See step 4
- Register the recognition codes to the ECUs.
- REGISTER ECU COMMUNICATION ID
- Register the ECU communication ID codes.
Refer to REGISTRATION [10/2022 - ]
Result
Proceed to NEXT
Result:
NEXT
See step 5
- Register the ECU communication ID codes.
- CHECK DTC
- Using the GTS, check if DTC is output.
Body Electrical > Smart Access > Trouble Codes
Result
Result Proceed to B2790-46 is output A B2790-46 is not output B
Result:
A
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]
Result:
B
END (ID CODE BOX (IMMOBILIZER CODE ECU) WAS DEFECTIVE)
- Using the GTS, check if DTC is output.