Saturn sunroof motor...limit switches?

The sunroof in my girlfriends 2001 Saturn SC2 broke back in Aug and I was the unlucky recipient of receiving the task of fixing it. I did a little research and discovered that thousands of people have had the same problem. I purchased the replacement guides from sunroof doctor, installed them this weekend and have the module installed back in the car.

My question is this:

Before connecting the motor back up to the unit, the thought occurred to me that there is no evident limit switches on the sun roof assembly. My first instinct was that there must be limit switches in the motor that determine the start and stopping points. To test this, I connected all the wiring back the way it was and tested the motor (still not installed). To my surprise the motor spins endlessly when "open" and "close" are depressed. When "vent" is depressed, the motor will sometimes spin 2 revolutions and stop while other times it will spin about 5 revs then stop. I find it hard to believe that this is this complicated seeing as how many people have claimed to have installed the replacement guides and their sunroof is working flawlessly. I am weary of installing the motor back in the sunroof for fear of breaking something from the motor continuing to rotate. Any advice you can give me would be most appreciated. Thanks

-Jesse

Reply to
Jstein
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I don't have a wiring diagram for the vehicle, but it's possible that power to the motor is controlled by a current sensor instead of limit switches. The current sensor could be built into the switch or be part of a chassis control computer.

The vent position probably isn't fixed, just wherever the sun roof stops after a brief application of power to the motor.

The limit switches could also be magnetic reed switches that are in the track assembly (hidden by the headliner) and are only operated when the sun roof actually moves past them.

John

Reply to
news

On my car there isn't - the motor simply stalls at the end stops. If it has auto operation it might use a current sensor to trip off the power.

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*I don\'t suffer from insanity, I enjoy every minute of it *

    Dave Plowman        dave@davenoise.co.uk           London SW
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Reply to
Dave Plowman (News)

I'd suggest that you ask your question on the sun roof motor on the rec.auto.makers.saturn newsgroup or check for info on the Saturn Fans Forum at

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Bob

Reply to
Bob Shuman

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