BMS_a123 — SW Internal Isolation
Full alert identifier: BMS_a123_SW_Internal_Isolation
Message shown in the car
Unable to charge Service is required
Alert description
The Battery Management System (BMS) detects that there is low high voltage isolation when pack contactors are opened.
Potential impact
Inability to charge, drive, or support the Low Voltage (LV) system
Set condition
The BMS detects that isolation dropped below the minimum threshold when pack contactors were open.
Clear condition
The BMS detects that isolation is above the minimum threshold when pack contactors are open.
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 R
BMS_
|
kOhm |
Pack Minus
BMS_
|
V |
Pack Plus
BMS_
|
V |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of BMS_a123.