DTC B228B-00: Battery Circuit or Ground Circuit Energization Malfunction [09/2023 - ]: Procedure
WARNING: This page is about a different car, the 2024 Lexus TX 550h+ and 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR (POWER SOURCE)
Pre-procedure1
- Disconnect the D38 certification ECU (smart key ECU assembly) connector.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition Result D38-6 (+B) - Body ground Ignition switch off 11 to 14 V V Result
Proceed to OK NG
Post-procedure1
- None
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE
Result:
OK
See step 2
- CHECK HARNESS AND CONNECTOR (GROUND)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Result D38-29 (E) - Body ground Always Below 1 Ω Ω Result
Proceed to OK NG
Result:
OK
END (TEMPORARY CONNECTION FAILURE IS SUSPECTED). Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE
- Measure the resistance according to the value(s) in the table below.