Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Auto Start/Stop (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).
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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