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I saw my name, or business name (Qmulus Technology) mentioned, although spelled incorrectly, so I thought I should respond.
First off, there is no reason that a properly repaired alarm/immo module should not last as long as an undamaged one, *as long as it does not get wet again*, then it is just as likely to be damaged as any other. Repair is a good option as it usually runs ~$225+shipping, and requires no programming or replacement of remotes. If the damage is too significant to make a reliable repair, the programming can be transferred in most cases to a good used or new module if a used one is not available. In some rare cases, the programming can get corrupted or lost, so it would have to be programmed from scratch. That is unfortunate as you lose remote programming, which cannot be recovered without the code that came with the remote. That is when things get expensive.
The key is if the alarm/immo gets wet, don't wait until things stop working to do something about it. If there is water under the seat, disconnect the battery, take out the seat and take out the alarm/immo and dry it out thoroughly. Removing power from the wet module is the most important step and should be done ASAP. You can soak it in water for days without damage if there is no power to it. If there is corrosion on the board, just drying it out or spraying it with electronics cleaner, etc. will not help. The worst corrosion occurs under the relays, and the ONLY way to take care of that is to remove the relays, clean the corrosion and properly repair damaged traces.
My advice is if insurance will cover it, go to the Porsche dealer and have it replaced. Book time is 10 hours, as it includes stripping the interior, shampooing the carpet, drying it out, replacing and programming the module (perhaps replacing the remotes) and reassembly. That can run $2500+ depending on labor rate and if you need new remotes because their diagnostics cannot communicate with the damaged module to transfer the remote data. (I can usually fix damaged ones to communicate to get the remote data if necessary, but dealers don't do that.)
If you have to pay, dry the car yourself, clean the drains(!), and get the module repaired or replaced with a good used one for $225-$400. Worst case a new module runs about $500-$800 (depends on part number) + programming.
Oh, and I have said this before, but I think it is good to reiterate. I do not recommend replacing the DME, alarm/immo, and key from another car as a set. Yes, it works, BUT the big problem is that those have all been tied to the VIN of the donor car. You will not be able to add keys, or replace those components individually if you have an issue down the road because the programming information that Porsche keeps in its system for your car will no longer be valid. The car will also report the donor cars VIN in diagnostics, which could pose issues on emissions tests, etc.
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'03 S, manual, 18" Carrera wheels, PSM, PSE, Litronic, 996 Cluster, +
Last edited by Qmulus; 03-15-2018 at 08:30 AM.
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2003 Boxster S
Parts Car, car parts
Honda Del Sol(s)
"Hers"
My Original '99
The 78 F350
This
That
The S 2.5
Other
Turbo
Christine
Frank N Stein
Ghost
Hybrid Mode
