Will disconnecting battery reset service info?

[PCNewman]

Installing afe stage 2 intake.
The MAF must be disconnected.
1- Does this require disconnecting the battery? (Instructions say yes)
2- When I disconnect the battery, does the computer remember the service info or does everything reset?
Thanks for any advice.

[MightyMouseTech]

Originally Posted by PCNewman

Installing afe stage 2 intake.
The MAF must be disconnected.
1- Does this require disconnecting the battery? (Instructions say yes)
2- When I disconnect the battery, does the computer remember the service info or does everything reset?
Thanks for any advice.

You don't have to disconnect battery. Just make sure car is completely off. (Push to start button is not illuminated) and just don't open a door or trunk while it is disconnected and wake the car up.

We do this dozens of times/day at the dealer. We try to avoid disconnecting batteries at all cost. The FRM often gets fried when disconnecting and reconnecting the battery on E82 and E90 cars.

[blue135]

Changed out steering wheel this week. So, had to disconnect battery (airbag). Service reminder still set where it was. Did not recognize the FRM risk, but seems ok.

[gjm120]

Originally Posted by MightyMouseTech

You don't have to disconnect battery. Just make sure car is completely off. (Push to start button is not illuminated) and just don't open a door or trunk while it is disconnected and wake the car up.

We do this dozens of times/day at the dealer. We try to avoid disconnecting batteries at all cost. The FRM often gets fried when disconnecting and reconnecting the battery on E82 and E90 cars.

Yikes! Anyway to lessen the risk when changing a battery?

[MightyMouseTech]

Originally Posted by gjm120

Yikes! Anyway to lessen the risk when changing a battery?

Can put a battery maintainer on the front charging points when disconnecting battery.

Edit: actually need a power supply. A regular maintainer will shut off as soon as battery is disconnected.

[bmw1racer]

Originally Posted by MightyMouseTech

We try to avoid disconnecting batteries at all cost. The FRM often gets fried when disconnecting and reconnecting the battery on E82 and E90 cars.

Wow, that's news to me... I don't recall that being mentioned in any of the battery replacement threads.

[PCNewman]

Originally Posted by MightyMouseTech

You don't have to disconnect battery. Just make sure car is completely off. (Push to start button is not illuminated) and just don't open a door or trunk while it is disconnected and wake the car up.

We do this dozens of times/day at the dealer. We try to avoid disconnecting batteries at all cost. The FRM often gets fried when disconnecting and reconnecting the battery on E82 and E90 cars.

Thanks!
I'm glad I asked.

[Esteban]

Originally Posted by gjm120

Yikes! Anyway to lessen the risk when changing a battery?

You can use a battery charger with a "Supply Mode," which supplies constant power to your car. This mode is meant for using when changing your battery but don't want to lose any of your car's settings. CTEK (among others) makes smart chargers that have this mode.

[gjm120]

Originally Posted by Esteban

You can use a battery charger with a "Supply Mode," which supplies constant power to your car. This mode is meant for using when changing your battery but don't want to lose any of your car's settings. CTEK (among others) makes smart chargers that have this mode.

The only modes on my CTEK 4.3 are Small, Normal, Cold weather (for low temps and AGM) and Recond ?

Stages 2 and 3 in the charging sequence are 4.3 amp for all but Small mode.

[Esteban]

Originally Posted by gjm120

The only modes on my CTEK 4.3 are Small, Normal, Cold weather (for low temps and AGM) and Recond ?

Stages 2 and 3 in the charging sequence are 4.3 amp for all but Small mode.

My CTEK 7002 has a supply mode:

[gjm120]

Originally Posted by Esteban

My CTEK 7002 has a supply mode:

Oh. Nice!
Before I need to change my battery again I may spring for one of those.