Originally Posted by aowolf
Well that day I have been dreading has finally come and my rear spoiler has stopped working automatically. I can raise and lower it manually but when I start the car and drive off the spoiler warning light does not go out.
One mechanic told me that the computer has a resistance test on the spoiler motor and if the current draw is to high it will disable the spoiler function. He said the nylon gears tend to strip slowly over time.
Is this true and if so how to I began to troubleshoot to make sure its the gears. If it is the gears does anyone have a supplier for new ones? I know the dealer just sells a new spoiler cartridge but I'm all for trying to MacGuyver it first.
Not sure about that gears strip over time comment.
Maybe my car has super titanium spoiler gears cause that spoiler's been up and down more times (over these ahem last 250K miles) than just about any spoiler I guess and it still goes up and down and while it is a bit tiny bit noisier when I listen to it in a closed in place with the engine off it is not that much noisier
Anyhow, in all these years, all the miles, never a hiccup, save once: I washed the engine and a week or so later the warning light came on and the spoiler remained up. I was unable to lower it with the button. Left the car sit. At lunch drove the car on city streets a few miles and when I got back from lunch I noticed the warning light was off and the spoiler was down. The manual raise/lower button worked.
The spoiler was possessed. Briefly anyhow.
(Might mention that since then the car was tapped from behind by an SUV (approx. 5mph impact) which damaged the rear bumper cover, a taillight assembly, even bent a piece of sheet metal that spans the width of the rear of the car and was up near the spoiler. However, the spoiler was unaffected by the collision.)
That you can apparently raise/lower the spoiler with the manual button suggests to me the basic hardware is ok, unless you hear gruesome noises from that area when raising/lower the spoiler.
I looked through what I have on the Boxster spoiler and it ain't much. Just instructions on how to remove/reinstall it. Nothing on diagnosing non-functionality.
Anyhow, my thinking is given what you report is there is a marginal connection between the DME and the spoiler. The signal to raise/lower the spoiler is not getting through to the spoiler raise/lower control unit. The warning light arises from the DME sensing something wrong with the wiring.
You might try tracing the connector and unplugging it and reconnecting it the idea being some surface corrosion has formed just enough to interfere with the signal.
If playing with the connector doesn't help then look for another connector or consider the wire's insulation has been compromised or the wire is broken.
It might even be the DME's output that controls the spoiler is damaged but that's a long shot.