DTC B1020-04: Central Gateway ECU System Internal 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.
- RECONFIRM DTC OUTPUT
Body Electrical > Central Gateway > Trouble Codes
Result
Result Proceed to B1020-04 is output A B1020-04 is not output B Result:
A
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to REMOVAL [10/2022 - ]
Result:
B
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ]