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Discussion Starter #1 (Edited)
Any advice on how to test or get rear section down? I've held the button even after it stops the first time nothing.

Talked to the previous owner and he said they never put the rear section down because you couldn't see out of it. So think maybe has never been lowered in 10 years...
 

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Hiya there! I've been trying to research this issue for a few days and I'm still not even sure how you would begin to tackle this. My 450 is having the same issue, though I put it in storage until all of this nasty weather finally ends.

I'm not sure how similar the cabrio roofs are between 450 and 451, so what may work for me may not work for you. First thing on my list is to properly lube the tracks, then I'll lessen the tension to give the motors some breathing room. If that doesn't allow the second section to drop, I'll have to continue figuring out this conundrum.

In the meantime, keep scouring this forum and clubsmartcar.com for answers, I know I am, too!
 

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Discussion Starter #3 (Edited)
Same i can't believe no one anywhere has a write up how to fix this, it can't be that hard. I just purchased a Service manual to see if that will be any help, but not had a chance to look at it.
 

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It's okay! :) I bought it knowing that the car would be a bit of a restoration project. I happily accepted the challenge. The roof was described to not even be able to make it all the way through Stage 1, so I'm happy I got it to be able to do at least that. There aren't any leaks and everything is present and in good condition, so that's good. Clubsmartcar has a lot of good information on the 450 (1998-2007) roofs (as does evilution.co.uk). Not much about not being able to get into Stage 2, but I think I can figure it out myself.

Here are my planned troubleshooting steps:

1. Replace side rails (they're rusting out).
2. Lube tracks.
3. (If roof still doesn't work) Manually crank the roof into position. I've read that sometimes you just need to get the lube spread out to get it back working again.
4. (If roof still doesn't work) Lessen tension.
5. ?

I'm not sure how similar the process would be on the 451. I mean, for starters your side rails shouldn't even rust.
 

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Alrighty, so I took my cabriolet out of storage, so I guess we’re in this together!

I need to reiterate that I don’t know how similar the tops are between generations or even if my fix will work for you, but here we go!
 

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So, I have good news and I have bad news. The good news is that my top is working fine...For whatever reason I expected the 450's top to work like the 451's...they do not work the same. The 450's second stage isn't motorized, you just move it into place by hand. My issue has been resolved.

That leaves us with your issue. I believe the 451s come with a crank, should you need to move the roof manually. Have you tried getting the second section to move using the crank?
 

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Discussion Starter #7
So, I have good news and I have bad news. The good news is that my top is working fine...For whatever reason I expected the 450's top to work like the 451's...they do not work the same. The 450's second stage isn't motorized, you just move it into place by hand. My issue has been resolved.

That leaves us with your issue. I believe the 451s come with a crank, should you need to move the roof manually. Have you tried getting the second section to move using the crank?
Crank? All I know about is you push the button once and it stops in first position, then hold again and it's suppose to go to Stage 2 but does nothing.

Glad you are fixed and ready to go!

I looked at a 450 acouple years back with a broken top also but guy started to take it apart so i ended up passing because i would of had to trailer it. But he had a full break down on how to fix it, which i can't seem to find for the 451.
 

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Me neither, honestly. I'm usually an expert in these things, but I've not had much of any experience in the cabrios until I got the 450. The 450 roofs can be operated by a crank in the event that the motor(s) fail. After scouring the 451's manual, it looks like the 451s may not have such a thing?

I put this thread up on some active smart owner Facebook groups, hopefully we'll get an answer shortly!
 

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That would explain why I didn't see it in the Manual! So I guess we're back to the start. What would cause the roof not to go to the second stage?
 
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