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Discussion Starter #1
Hey guys,

A while back I picked up a clean 54,000 mile 1995 900 with a soft top that didn’t work. I’ve been working with a Saab specialist to fix it, but seem to be hitting a wall on progress.

  • When I bought it, the release lever had already been pulled
  • The original SID that was in the car was totally dead when I bought it. Switched it for a good used convertible unit and it now works as it should
  • Car must think the top is down - trunk button on drivers door and key fobs don’t work
  • The rod out of the tonneau motor was majorly twisted just before the u-joint, as if someone had tried to wrangle it out. We installed a good salvage motor with a reinforcement kit
  • The softtop computer showed no signs of life, so shop swapped in a good one which cleared two fault codes
  • Shop said Tech 2 indicated potentiometer issue, but not where. Replaced potentiometer on tonneau motor with new Genuine sensor, no change
  • Shop said they could get 5th bow to move with a tech 2 but not anymore. When it did move the readings were backwards for up and down
My understanding is mostly second hand/what the shop is telling me, but from what I’ve pieced together on this forum the next culprit seems to be the 5th bow micro switch. Is that logical?

Anyone run into this before? I want to help the shop as it’s the only one in 300 miles willing to touch and reprogram it, but have already thrown a lot of parts at it.
 

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Bobsaabit may be a better source (where is jakejm79?). I'd say you want to look everything over carefully for evidence of amateur repairs.

Alternately, you may be able to source a good used top that works properly. Yes, that would have made more sense back before you invested money in the current top, but don't let the sunk costs fallacy get you.
 

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Try physically disconnecting the 5th bow latching motor.
If the top works while eliminating that potential major problem you'll know how to progress.
 

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Check this link for a great troubleshooting guide. http://www.saabservices.com/cvtop data/ng900cv top diagnosis and troubleshooting.pdf

I also attached a programming guide. Between a new SID, potentiometer and TSAS you probably need to reprogram the top and sid.

TSAS goes through initial system checks before it will allow the top opening or closing process to start. A trunk, front latch, or top storage bag open/close sensor issue will stop everything from working. you mention a trunk latch issue, the shop should be able to read if it is showing trunk latch open which will stop top from working. You can read all the top related sensor readings with tech2 to ensure the front latches are open and the top storage bag is in the open/ready position as well.

You can also step through the entire opening process activating each function one at a time with tech2 to pinpoint problem. Did you check TSAS fuse, harness connections and looked for obvious tears or cuts in the harness? Make sure switch is good as well, the top switch contacts inside can scorch and disintegrate.
 

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Discussion Starter #6
Thanks for the advice everyone. I showed this to the shop and they were able to isolate it down to a failed 5th bow sensor. Once that comes in we should be set! Will come back with the result.
 
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