200 Q45 Sunroof Problems

[b4oliver]

I've searched both recent and archived, nothing on this. I just replaced the battery on my 2000 Q 45. Had it out about an hour while I cleaned up the cable of corrosion. After I installed the new battery, the sunroof doe not open the same as before. Push the slide open button all the way once and it opens about 3", push again and another 3" till you finally get it all the way open. Before the battery change it would automatically open all the way with one push. Same thing on close. Same problem with the tilt button now, only opens partway with each push. Also the tilt down will now close the roof and it you push it again, will start to slide roof open 3" at a time. Seems to me to be a programing issue which has changed since the car had no power for an hour. Any help would be appreciated!!

[Q45tech]

Body control module memory fade from long battery replacement cycle. 1 hour? Dealer reprogram or Consult II.

In the future secure a cigarette adapter battery to hold the memories up when changing main batteries..............what pros do to save all the effort.

[b4oliver]

Thanks for the info Q45tech.

[Skibane]

In the future secure a cigarette adapter battery to hold the memories up when changing main batteries..............what pros do to save all the effort.

At least on the Y33, the cigarette lighters (as well as the accessory power outlet in the bottom of the center console storage compartment) are switched with the ignition key, and are only connected when the switch is in either the ON or ACC positions (a really stupid, but all-too common "feature" on imported cars, IMO).

Problem is, even if you remember to turn the ignition switch to either the ON or ACC positions before removing your old car battery, the resulting current drain would kill a tiny lil' 9 volt transistor battery REAL quick!

Is there a work-around?

[b4oliver]

I was reading through my FSM and under battery it says. "if vehicle to be stored for a long period of time, disconnect the negative battery cable.Why would it recomment this if you would lose the info in the BCM ? Just so you'd take back to the dealer?