Boxster Immobilizer Module- under seat

[rexcramer]

Manny, thanks for the write up. Good to hear you are back on the road. The water proof box sounds like a no-brainer.

[Gelbster]

Just drill a couple of small drain holes at the lowest part of the floorpan under the seat ?
If you plan to do any deep water fording that could be counterproductive but ....

[Manny986]

Yeah. I tried myself to make one using a waterproof box I bought on Amazon. It could be done with good results. A very sensitive area to work on are the two holes I had to make to allow the cables to enter into the box. I wasn't really sure if they will not allow some water to come in. Three things made me decide to buy their very well done box:
- They found a way to easily access the 15A fuse of the Immobilizer. You don't need to open the box and beak it waterproof condition to replace it in case it blown out. They have designed a special rubberized waterproof extension that comes out of the box with the fuse cradle at the very end and covered.
- The way the cables are entering the box is, indisputable, way, way much better than mine and will 100% stop the water from coming into the box
- The box will fit under the seat in the box cradle exactly as the original one so it wont be loose and moving around.
Specially for Porsche owners that never have had the disgrace of getting a water damaged Immobilizer this is a bless and will save not only money but time, stress and frustration. This damage is one of those things that, when happen, you really regret not having done something to prevent it.

[old911doc]

Sorry to read of your misfortune. I had the same experience with my '97 Box, except that the windows were fully up and the drain tubes all around were fully open. In really torrential rain, water enters the rear drain pans faster than the small tubes can drain it out, so the pans fill to overflow into the interior. Porsche engineers, in a fit of inspiration, located the water-vulnerable immobilizer right where the puddle would form.
I had a very good experience with Jorge at Specialized ECU Repair in Oakland Park, FL near Fort Lauderdale. He seemed to know his stuff quite well, and seemed a very straight-up guy, so I can recommend him for your repair. They have a good website, ecudoctors.com.
I would urge you get their waterproof box kit as well. It wasn't ready for sale when they repaired the immobilizer in my red Box, but as soon as it came out I ordered three for the three Boxsters in our family.
I would urge that this box should be fitted to all Boxsters at such time you acquire a Boxster. It's about one-fifth the cost of the ECU repair, and can be done electively in about an hour without any tool more specialized than a Torx bit, which is thoughtfully included in the kit. The car is ready for use immediately while the silicone sets.
And lastly, there is a really high-tech modification you should perform while you have the seat out; DRILL A HOLE ! A 3/8" hole under the immobilizer would likely avert many wet-immobilizer problems in the first place. I have drilled both left and right floor pans in all three of our cars and we haven't lost another immobilizer to water.