MSA and power management: Notes

The battery status that is calculated in the Advanced Power Management (APM) is a major influencing factor on the MSA. The APM monitors the following measured variables: battery charge state, battery temperature, voltage dip during engine start, power consumption of the switched-on consumer units.

In the event of engine shutdown, excessive power consumption must be avoided. To ensure this, at terminal 15 On and engine OFF the APM disables all large current consumer units or reduces their consumption. The displays remain active.

The following consumer units are affected:

• Rear-window defroster (demister)
• Mirror heating
• Seat heating
• Heater blower (the IHKA is responsible for adaptation of the heater blower).