DTC B1020-04: Central Gateway ECU System Internal Failure [09/2022 - 11/2022]: Procedure
WARNING: This page is about a different car, the 2023 Toyota GR Corolla and 2023 Toyota Corolla. 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 DTC B1020-04 is not output from the central gateway ECU (network gateway ECU) A DTC B1020-04 is output from the central gateway ECU (network gateway ECU) B Result:
A
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]
Result:
B
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to REMOVAL [09/2022 - 11/2022]