DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 118 (Can Communication System (HV) - Circuit Tests (1 Of 9) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for HV Model) >> DTC B1020-04: Central Gateway ECU System Internal Failure [11/2023 - ] >> Procedure

DTC B1020-04: Central Gateway ECU System Internal Failure [11/2023 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. RECONFIRM DTC OUTPUT 

    Body Electrical > Central Gateway > Trouble Codes 

    Result

    Result Proceed to
    B1020-04 is not output A
    B1020-04 is output B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    B 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [11/2023 - ] 

Diesel-Data.com