E89 Roof goes up and down on interior buttons but not on fob?

B21 · Post by **B21** » Sat Mar 23, 2024 6:39 pm

So bit of a weird one..roof goes up and down on interior buttons..with or without engine running..

Using comfort access key fob you can lock the car / fold mirrors /close windows..you can unlock the car / mirrors..

You can release the boot.

But you can’t open or close the roof on the fob.

Salient points are

Gen 3 Mr 12 Volt MMI box fitted

ID4Motion digital cluster fitted

Only error is a long standing comfort access door handle error which has been there since I acquired the car and previously didn’t stop the roof opening or closing on the fob..

If you’re in the car and try and open / close on the fob you can hear relays clicking but no movement and a red light momentarily appears on the roof button..but after the first attempt the red light doesn’t re-appear.

Scanned the car and no other errors shown,,this is after 200 miles of driving so everything warm and battery fully charged.

Whilst twiddling over the winter power was repeatedly disconnected and reconnected many times.

Any ideas ?

john-e89 · Post by **john-e89** » Sat Mar 23, 2024 8:23 pm

Undo the battery for half an hour + then re-code it as a reboot given all the interruptions it’s had…?

All I can come up with….

Nictrix · Post by **Nictrix** » Sun Mar 24, 2024 12:33 am

Keyfob battery?

enuff_zed · Post by **enuff_zed** » Sun Mar 24, 2024 8:39 am

Nictrix wrote: ↑Sun Mar 24, 2024 12:33 am Keyfob battery?

I was thinking this too.

B21 · Post by **B21** » Sun Mar 24, 2024 9:41 am

Well tried the other key that I never use..that was completely flat..two new 2032 going in when I get home after the weekend run..

B21 · Post by **B21** » Mon Mar 25, 2024 10:13 am

2 fresh CR2032 batteries in both fobs and the roof is going up and down like a good un..amazing what electricity does for micro processors…

Nictrix · Post by **Nictrix** » Mon Mar 25, 2024 4:17 pm

Sometimes you just need to start with the easy option to at least rule it out.

B21 · Post by **B21** » Mon Mar 25, 2024 6:50 pm

Nictrix wrote: ↑Mon Mar 25, 2024 4:17 pm Sometimes you just need to start with the easy option to at least rule it out.

Quite so..having said that..in my car..the roof doesn't operate on the fob (new batteries) if the main battery is low..but does operate on the buttons..

dumaurier7 · Post by **dumaurier7** » Wed Mar 27, 2024 12:37 pm

I am experiencing the same, but my fob eats a battery per week so clearly there is an issue with it. I am in the process of having it replaced so I'll be able to see what happens with the new fob,

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