VCFRONT_a608 — T LVBMS Bleed Fet Failure
Full alert identifier: VCFRONT_a608_TLVBMS_BleedFetFailure
Alert description
A bleed Field-Effect Transistor (FET) on the Battery Management Board (BMB) is not operating as designed. This will prevent the battery from balancing the brick by decreasing the brick voltage.
Potential impact
The bleed FET will prevent the battery from properly balancing the brick by bleeding the voltage down.
Set condition
Upon a periodic wake, after an ECU reset, or every 6 hours, the Low Voltage Battery Management System (LVBMS) will test all bleed switches by switching them on in turn. If the sensed brick voltage does not significantly change, this alert is set.
Clear condition
The bleed test reports sufficient voltage change across each brick.
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 |
|---|---|
Delta V
VCFRONT_
|
V |
Retry Count
VCFRONT_
|
— |
| Signal | Unit |
|---|---|
Bleed Fet Failure Brick Id
VCFRONT_
|
— |
Set From Nvm
VCFRONT_
|
— |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCFRONT_a608.