BMS_a151 — SW external isolation
Full alert identifier: BMS_a151_SW_external_isolation
Message shown in the car
Vehicle may not restart Service is required
Alert description
The Battery Management System (BMS) detects that high voltage (HV) isolation is too low while pack contactors are closed.
Potential impact
Inability to charge, drive, or support the Low Voltage (LV) system
Set condition
The BMS has detects that HV isolation is below the warning threshold while contactors are closed.
Clear condition
The BMS has detects that HV isolation is within the acceptable threshold while contactors are closed.
Signals to check
Open this alert in Service Mode Plus and review the Payload tab. Use the field names below to identify the values shown by your vehicle.
| Signal | Unit |
|---|---|
Iso Negative R
BMS_
|
kOhm |
Iso Positive R
BMS_
|
kOhm |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of BMS_a151.