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99 alarm query

boxstermao
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boxstermao Member

boxstermao

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i recently discovered that my 99 C4 tiptronic coupe has a non functioning alarm. both keys work fine, the indicator flashes, and the doors lock with the remote. but when i opened the car manually, the alarm does not sound. i also found out that the prevoius owner had hooked up a set of aftermarket horns. is the alarm systm connected to the horns and the said modification might be at fault? is reprogramming the alarm a function only a PST2 can do? your thoughts pls. TIA

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Loren Member

Loren

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The vehicle (road) horns are not connected to the alarm horn/siren.

The only way to fully test the alarm system is with a PST2 or PIWIS tester. Repairs can then be made and faults reset.

If there is a key/immobilizer issue then only a dealer can change that programming with a PST2 or PIWIS - after they request and receive the authorization codes from Porsche.

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trauh Member

trauh

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Try replacing the alarm horn, as I had a similar problem with my car. It is an inexpensive part and it takes all of 5 minutes. The horn is located in the trunk beneath a blac plastic panel at the base of the windshield. Good luck!

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