Auxiliary Battery in a F01 / F02? Where? - Bimmerfest - BMW Forums



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Old 08-09-2019, 03:55 PM
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Bimmer32 Bimmer32 is offline
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Auxiliary Battery in a F01 / F02? Where?

I think my dealer is pulling a fast one. I took my car in for a Steering warning / drive moderately. See Service Center. And they want to replace the auxiliary battery for $840 saying that it is responsible for the power steering motor.

I know MB has a small auxiliary battery for the accessories and some BMW models (other forum threads talked about it) have it too, but the cost to replace it is just outrageous. MB's auxiliary battery is a small UPS sized battery that cost about $35 last time I checked for my MB E350.

Could anyone shine a light into this situation? Thank you.
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Old 08-09-2019, 06:21 PM
HerbP HerbP is offline
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Here is a link to New Tis for your car. A search does not seem to show that option, but it might be possible. The battery is located in the trunk, maybe they think that is a AUX battery?

https://www.newtis.info/tisv2/a/en/f...?q=aux+battery
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Old 08-09-2019, 07:34 PM
Robin750 Robin750 is offline
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I believe you have IAS, correct? LCI models with IAS have 24V EPS, which on the G12 requires an auxiliary battery (in the engine compartment). I'm guessing the F01 is similar, check under the trunk floor to confirm. I doubt there is any space in the engine bay for it.

https://www.newtis.info/tisv2/a/en/f...ery/1VnXzY6x4V

Maybe you can replace it yourself? I'm guessing it might also require registration.
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Old 08-10-2019, 07:45 PM
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Bimmer32 Bimmer32 is offline
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You'll are so resourceful. Thank you for the links. I was doing some research today on realoem.com and found the item number: 61212432179 for the auxiliary battery. Apparently, all BMW with EPS have this battery as an additional (different size), and it's about as expensive as the main battery. ~$192

When the weather is less than 100 degrees outside, I'm going to see if it is in the same area as the main battery. A master tech told me that the pre LCI 09-12 has a partial hydraulic IAS system. Hence, no battery is needed. With the LCI (13'-15'), they went full electronic power steering for F01/F02 with IAS and ARS. That probably accounts for why there were much fewer LCI models with IAS and ARS due to a different system and cost. Both the Auxiliary battery and the main battery has not been replaced, so I'm running on 6+ years.

In the end, my master tech can do it for much much cheaper than what the dealer wants. Looks like two battery replacements every 6 years or less from here on out.
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Last edited by Bimmer32; 08-10-2019 at 08:12 PM.
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Old 08-11-2019, 06:42 PM
HerbP HerbP is offline
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If we all get 6 years out of a battery, we are doing something right!
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Old 08-15-2019, 09:12 PM
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Bimmer32 Bimmer32 is offline
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I looked in the trunk the other day. Seems like the auxiliary battery is more expensive than the main battery. But it is smaller.
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Last edited by Bimmer32; 08-15-2019 at 09:14 PM.
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Old Yesterday, 09:42 PM
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Bimmer32 Bimmer32 is offline
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My hands starts to itch when I have slow time, and I think I'm going to attempt to replace the batteries myself. If half way, my back gives out, I'll have to drive it to one of the shops near me and let them finish the rest.

My question is, does the auxiliary battery also need to be registered/reset? My instinct is that it does not. In any case, this battery is about 1/4 size of the main battery, yet, it cost more than the main battery at a cool retail price of ~$265.

I'll post some pics when I have time, and maybe some instructions. It will be rare that anyone with an LCI will also have ARS/IAS. So if you do not have these features, you will likely not need to replace such battery. In any case, it will help me remember what I did years from now. Stay tune.
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