DTC B1020-04: Central Gateway ECU System Internal Failure [09/2023 - ]: Procedure
WARNING: This page is about a different car, the 2024 Lexus TX 500h. 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 [09/2023 - ]
Result:
B
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ]