VCLEFT_a544 — LV Battery Comms Bus Turned Off
Full alert identifier: VCLEFT_a544_LVBatteryCommsBusTurnedOff
Alert description
The vehicle controller has disabled communications over the bus that connects to the low voltage (LV) battery after detecting a condition (or conditions) that may cause the LV battery to become overdischarged. To avoid overdischarge that could make the LV battery unrecoverable, do not restore communications until the LV system is fully supported by the Power Conversion System (PCS).
Potential impact
The vehicle controller will have less information about the LV battery until it is serviced. Headlamps and windshield wipers may be unavailable, or may not function as expected.
Set condition
The vehicle controller detects the LV battery may become overdischarged unless it sleeps, and also determines vehicle conditions are OK to disable LV battery communications.
Clear condition
Clears upon any of the following: (1) The RECONNECT-LV-BATTERY routine is run from the vehicle touchscreen in Service Mode or via Toolbox; (2) A vehicle power cycle is completed; (3) Vehicle firmware install is initiated; (4) The vehicle is no longer in Service Mode.
Signals to check
These diagnostic fields are associated with VCLEFT_a544. Check the alert's Alert Log in Service Mode Plus for available values.
| Signal | Unit |
|---|---|
Lvbmssoc
VCLEFT_
|
% |
Frunk Open
VCLEFT_
|
— |
Service Mode
VCLEFT_
|
— |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCLEFT_a544.