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masraum masraum is online now
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Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 57,101
"rear control module" under driver's seat and water intrusion

Apparently, it's fairly common and/or well known that 997/987 have a module under the driver's (left) seat that controls things like tail lights, rear spoiler, etc..., and if/when water gets into the floor board, the module can malfunction. I have never been worried about it because at home and work, my car is in a garage, until we moved to our current house 3 years ago. For a long time I kept it under a cover, but since I'm driving more frequently, I am not putting the cover on every time I get home.

We got ~8.5" of rain over ~3 days earlier this week. Yesterday afternoon, I looked out the window and noticed that my brake lights were on and the spoiler was up. I didn't think about the water in the floorboard thing, but did some fiddling. Eventually over the next 2-3 hours, I realized that it was probably water in the floorboard, got the standing water sopped up with a towel, pulled the driver's seat and module, opened it up and dried it out and let it dry inside over night. I popped it back in this morning, and the brake lights seem to be working correctly, and the spoiler is working. WHen you pop the cover off the box you can see the circuit board. In one spot there was some schmutz in the gap between the case and bottom/back of the circuit board. With that wiped off and everything dry, the board looks OK. I think I got to it before any permanent damage was done. THere was hardly any water in the floorboard. I still have some work to do to ensure the padding under the carpet is dry, and to make sure that the drains are free flowing.

I plan/hope to keep the drains clear, so it hopefully, shouldn't be an issue. But, considering the possibilities, I feel like a layered solution that keeps the module drier wouldn't be a bad idea.

Does anyone know anything about keeping the module drier? It's too bad it wasn't designed like the old Ford control modules that were encased in some sort of glue/epoxy. I'm not sure how dry you can keep these things other than keeping water out of the floor boards since the wiring (3 large bundles plug in from the side.
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Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa SOLD 2004 - gone but not forgotten
Old 01-26-2024, 11:45 AM
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