Imminent battery disconnect signal error
Check and correct trouble codes in the chassis to eliminate faults that may prevent the messages from beeing sent. If there are more fault codes for message or communication error, check the CAN bus wiring on both sides of the chassis system's gateway and its power supply. Check and correct trouble codes in the chassis (if there is any related) to eliminate faults that may prevent the messages from beeing sent.
What you'll see
Functions dependent on the signal wil be effected: e.g. Bus Body State Management (BBSM), Accessory mode and DCU Wake up Request. If the signal is not available, e.g.: - It can prevent Emergencymode from activating while the rest of the bus is online. - The doors are still functional when the Battery Master Relay switch has been turned off. The bus gets no notice in advance that power loss is imminent.
System reaction
Body Node System (BNS) does not shutdown properly when the Battery Master relay switch has been turned off.
Diagnostic depth
Signal from BCI to indicate imminent battery disconnect has value Error.
Can be due to short circuit to battery for the signal in the CMS.