rear spoiler problems, please help!
04-15-2012, 05:41 PM
#1
2nd Gear
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rear spoiler problems, please help!
Hi, I realise this is a regular topic but not seen this problem answered...
Anyone know the PorscheDoc or someone very good with electrical glitches?
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.
I am an electronics engineer and have eliminated a problem in the spoiler meachanism through 1) thorough electrical and mechanical testing of limit switches and 2) 'fooling' the system by simulating the limit switches with external manual switches instead of the ones in the spoiler.
I have also verified the relevant electrical connections all the way back to the connector on the back of the instrument cluster. All OK.
If i manually drive the spoiler 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 unless the ignition is turned off and then back on. It then lowers just the 2cm i mentioned earlier. In fact, it drives down until the 'up' limit switch is unmade.
Does anyone know exactly what logic drives the spoiler? TTL, PLC or what?? Can it have somhow been 'fooled' and now be in a mixed up state?? From my tests, it's almost certainly a problem in the control of the spoiler rather than the spoiler itself. Can there be a need for a factory reset/diagnostic/re-instalation of software???
Have done a battery out reset with the espoiler both up and down but this has made no difference.
I would very much appreciate your views on this.
Thanks in advance
Rob
Anyone know the PorscheDoc or someone very good with electrical glitches?
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.
I am an electronics engineer and have eliminated a problem in the spoiler meachanism through 1) thorough electrical and mechanical testing of limit switches and 2) 'fooling' the system by simulating the limit switches with external manual switches instead of the ones in the spoiler.
I have also verified the relevant electrical connections all the way back to the connector on the back of the instrument cluster. All OK.
If i manually drive the spoiler 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 unless the ignition is turned off and then back on. It then lowers just the 2cm i mentioned earlier. In fact, it drives down until the 'up' limit switch is unmade.
Does anyone know exactly what logic drives the spoiler? TTL, PLC or what?? Can it have somhow been 'fooled' and now be in a mixed up state?? From my tests, it's almost certainly a problem in the control of the spoiler rather than the spoiler itself. Can there be a need for a factory reset/diagnostic/re-instalation of software???
Have done a battery out reset with the espoiler both up and down but this has made no difference.
I would very much appreciate your views on this.
Thanks in advance
Rob
04-16-2012, 02:25 PM
#2
Race Director
Hi, I realise this is a regular topic but not seen this problem answered...
Anyone know the PorscheDoc or someone very good with electrical glitches?
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.
I am an electronics engineer and have eliminated a problem in the spoiler meachanism through 1) thorough electrical and mechanical testing of limit switches and 2) 'fooling' the system by simulating the limit switches with external manual switches instead of the ones in the spoiler.
I have also verified the relevant electrical connections all the way back to the connector on the back of the instrument cluster. All OK.
If i manually drive the spoiler 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 unless the ignition is turned off and then back on. It then lowers just the 2cm i mentioned earlier. In fact, it drives down until the 'up' limit switch is unmade.
Does anyone know exactly what logic drives the spoiler? TTL, PLC or what?? Can it have somhow been 'fooled' and now be in a mixed up state?? From my tests, it's almost certainly a problem in the control of the spoiler rather than the spoiler itself. Can there be a need for a factory reset/diagnostic/re-instalation of software???
Have done a battery out reset with the espoiler both up and down but this has made no difference.
I would very much appreciate your views on this.
Thanks in advance
Rob
Anyone know the PorscheDoc or someone very good with electrical glitches?
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.
I am an electronics engineer and have eliminated a problem in the spoiler meachanism through 1) thorough electrical and mechanical testing of limit switches and 2) 'fooling' the system by simulating the limit switches with external manual switches instead of the ones in the spoiler.
I have also verified the relevant electrical connections all the way back to the connector on the back of the instrument cluster. All OK.
If i manually drive the spoiler 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 unless the ignition is turned off and then back on. It then lowers just the 2cm i mentioned earlier. In fact, it drives down until the 'up' limit switch is unmade.
Does anyone know exactly what logic drives the spoiler? TTL, PLC or what?? Can it have somhow been 'fooled' and now be in a mixed up state?? From my tests, it's almost certainly a problem in the control of the spoiler rather than the spoiler itself. Can there be a need for a factory reset/diagnostic/re-instalation of software???
Have done a battery out reset with the espoiler both up and down but this has made no difference.
I would very much appreciate your views on this.
Thanks in advance
Rob
Sincerely,
Macster.
