DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Smart Key System (For Start, Except HV) - Diagnostic Codes (1 Of 2) >> SMART KEY SYSTEM (for Start Function, Gasoline Model) >> DTC B228B: System Voltage or GND Energization Malfunction [12/2019 - 11/2023] >> Procedure

DTC B228B: System Voltage or GND Energization Malfunction [12/2019 - 11/2023]: Procedure

  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE) 
    1. Disconnect the H48 certification ECU (smart key ECU assembly) connector.
      GTY854139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Certification ECU (Smart Key ECU Assembly))
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H48-4 (+B) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY854140Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Certification ECU (Smart Key ECU Assembly))

      Standard Resistance

      Tester Connection Condition Specified Condition
      H48-18 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (TEMPORARY CONNECTION FAILURE IS SUSPECTED). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE 

Diesel-Data.com