BMS_a030 — Impedance Deviation

Full alert identifier: BMS_a030_Impedance_Deviation

Alert description

High impedance was detected on one or more bricks.

Potential impact

One or more cells in a brick are likely missing, resulting in a high impedance current path. Other potential causes are a high Direct Current Resistance (DCR), intermittent anode laser weld on the given brick(s), or an islanded brick.

Set condition

Impedance for one or more bricks exceeds the noise threshold for several measurement counts.

Clear condition

All bricks have impedance measurements within the noise threshold.

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
Fault Threshold `BMS_a030_faultThreshold`	Ratio
Max Brick Impedance `BMS_a030_maxBrickImpedance`	mOhm
Max Normalized Impedance Dev `BMS_a030_maxNormalizedImpedanceDev`	Ratio
Worst Brick Soc `BMS_a030_worstBrickSoc`	PCT

Signal	Unit
Num Bricks `BMS_a030_numBricks`	—
Worst Brick ID `BMS_a030_worstBrickID`	—

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of BMS_a030.