BMS_w009 — SW Pos Contactor Drive

Full alert identifier: BMS_w009_SW_Pos_Contactor_Drive

Message shown in the car

Service is required Schedule service now

Alert description

There is an issue with the positive contactor drive circuit. This alert may indicate an open contactor drive circuit, a falsely closed contactor loop, an increase in the contactor coil current during economized operation, or that a contactor has popped open during operation.

Potential impact

Inability to charge, drive, or support the low voltage (LV) system

Set condition

The battery management system (BMS) detects unexpected current through the positive contactor drive circuit.

Clear condition

The BMS detects nominal current through the positive contactor drive circuit.

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
Coil Current `BMS_a009_coilCurrent` 255 SNA	A
Vehicle 12 V `BMS_a009_vehicle12V` 255 SNA	V

Signal	Unit
Contactor State `BMS_a009_contactorState`	—
Ctr `BMS_a009_ctr` 0 DR POS 1 DR NEG 2 ANC POS 3 ANC NEG 4 FC POS 5 FC NEG 6 UNDEF	—
Ctr Err Type `BMS_a009_ctrErrType` 0 OPENED FAILURE 1 WELDED 2 EEPROM 3 DRIVESHORT PULLIN 4 COILIMPEDANCE REDUCED 5 DRIVEOPEN PULLIN 6 UNEXPECTED DRIVECURRENT	—
Ctr Set Failed `BMS_a009_ctrSetFailed` 0 CTR DR 1 CTR ANC 2 CTR FC 3 SNA	—
Pre Chg State `BMS_a009_preChgState`	—

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of BMS_w009.