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996 spoiler problems

Old 04-14-2012, 11:36 AM
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Join Date: Apr 2012
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Default 996 spoiler problems

Hi, aware this has been a well discused topic but can't fine anyone with quite the same problems...

Have a 98' 996. The spoiler is stuck 'up'. On re-setting the ignition (turning off/back on), the lower button will lower the spoiler about 2cm and then it stops. The 12v is removed from the 'lower' function as soon as the spoiler up limit switch is de-activated rather than when the down limit switch is made.

I am an electronics engineer and have eliminated a problem in the spoiler meachanism through 1) thorough electrical and mechanical testing of system/limit switches and 2) 'fooling' the system by simulating the limit switches with external manual switches.

I have also verified the relevant electrical connections all the way back to the connector on the back of the instrument cluster. All OK showing less the 1 ohm resistance.

If i manually drive the spoiler all the way down (by connecting 12v directly to the motor) then when i press the 'up' button the spoiler raises all the way but continues to drive up even though the up limit switch is electrically made. It only stops when it appears to time-out. This has partially damaged the rack and pinion drive although it does still work OK mechanically. From this position, it will not drive down again unless the ignition is turned off and then back on. It then lowers just the 2cm i mentioned earlier.

What logic drives the spoiler? Can it have somhow been 'fooled' and now in a mixed up state?? From my tests, it's almost certainly a problem in the control of the spoiler and not the spoiler system itself.

I have tried a battery out 'reset' when the spoiler is parked in both states but no change.

I would very much appreciate your views and help on this.

Thanks in advance

Old 04-15-2015, 10:41 AM
Junior Member
Join Date: Apr 2015
Posts: 1

Hi Rob,

I have the same exact problem. Did you ever find a solution to this?
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