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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > BMW Coding > ISTA D and Voltage Stabilizer

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      01-04-2021, 06:59 PM   #1
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ISTA D and Voltage Stabilizer

I will soon be replacing my BMW's transfer case fluid, and along with this I've read the transfer case adaptations need to be reset. ISTA D can do this pretty easily, but I'm wondering, when using ISTA D to do an adaptations reset, do I need a voltage stabilizer? A battery charger seems like an obvious safety measure to prevent the battery voltage from dropping too low, but is that enough to keep the battery voltage high during the programming?

(I'm new to BMW and their software in general, just want to be extra careful not to brick my DSC module).
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      01-05-2021, 04:34 PM   #2
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For normal maintenance operations not necessary but I would still put a full charge on the
battery beforehand . The big danger is when you are updating the software in the whole car.

Maintenance items should need the extra voltage.
Programming that take a long time and draws a lot of current you need one.
As in total car update.
Coding not necessary as long as you are doing a long session.

If you are working on the car a long time and the car is awake it can drain a weak battery.
Check voltage before and after working on the car.
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coding, ista, programming

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