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E61 auto roll-up boot cover retraction

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E61 owners with the auto roll-up boot cover, does the cover fly up or move up slowly when you open your tailgate or glass?

 

 

My brother and I both have mid 2008 e61 535d's, they're only 11 days apart and 13 in chassis number!

Both have the power tailgate and both have the auto roll-up boot cover, it lifts up the c pillar when you open the tailgate or glass and is then returned to the closed position when the tailgate or glass closes. 

However, both behave differently when we open the tailgate/glass!

Mine flies up quickly. 

His raises slowly with the motor working.

 

Which is it meant to be?

 

Both park again, pulling the cover back down into the closed position after closing the tailgate/glass.

Mine makes some more motor noises after this, as it moves the carriage back up to the top of the c pillar, so that the cover flies up again.

My brother's doesn't, his waits for the tailgate/glass to be opened again and retracts slowly.

 

Additionally, the boot cover isn't always released in my brother's car. I know sometimes they can be a bit slow releasing (I think it's the spring at the roller end that's not quite as strong) but my brother's doesn't release rather often, I reckon this is linked to tge retraction issue...

 

I think mine is the one that works correctly. It would be sensible that you would want the cover out of the way quickly if you had your hands full etc. Standing waiting for the cover to retract is a bit silly, even if it's only a handful of seconds. 

Also, letting all the motors do their dance after the tailgate/glass is closed (when you get on with something else) makes more sense to me. 

But, I don't know for certain. 

 

Also, what would cause one to behave incorrectly?

 

Let's say my brother's isn't working as it should. It knows that either the tailgate or the glass is shut as it retracts the cover. But it doesn't return the carriage back to the top afterwards. 

It knows that it needs to release as it goes up, albeit slowly. So, I reckon that any contacts (confirming tailgate/glass are locked) in the locks are ok.

 

Is there a contact (microswitch?) to tell the motor that it's reached the end of its travel?

 

Could this be coded or is it more likely to be a bad contact somewhere?

 

I've had a quick look at the wiring diagram but nothing stands out that could cause this.

 

Both cars' tailgate wiring has been done (by me) and everything else works. 

 

Has anyone had this or a similar issue before?

 

Any help would be appreciated :)

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Mine used to spring up when i opened the tailgate, not sure about the glass. it doesn't do that anymore, I put it down to the wiring loom issue.

I never knew they would return again when closed or unless that was an option

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Thanks. I asked the same question on facebook, lbeit a bit shorter. It seems that the cover is meant to fly up. On some, either power tailgate or auto roll up cover, the cover is returned to the closed position automatically.  Maybe you had a semi auto cover.

It's this auto system that's not behaving for my brother. 

 

Link to the facebook bit (for comlletion):

https://m.facebook.com/groups/499285920177689?view=permalink&id=1875547549218179

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10 hours ago, Blobby said:

Mine used to spring up when i opened the tailgate, not sure about the glass. it doesn't do that anymore, I put it down to the wiring loom issue.

I never knew they would return again when closed or unless that was an option

 

Could be the small motor/gear assembly under the left hand trim panel has stopped working.  I've got to replace mine, as it's very noisy.

 

Part Number is 9918003164

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Had a look last night at his and it's behaving correctly!

I think they do re-calibrate automatically but other than that, I've no idea what happened!

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If your motor is noisy you could do what I did.

If you remove the motor the plastic the motor is mounted to allows a bit too much space between the motor gear and the drive gear.

I used a small bit of plastic as a shim to move it closer to the gear and used a cable tie to keep the shim in position.

Mine was done shortly after I got the car 18 months ago and the tailgate is opened multiple times every day except Sunday in my job.

No problems and quiet. 

Might be worth a go. 

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