Alarm horn with m525 alarm module

[Porschelibrarian]

Trying to help a friend...he has a 2004 boxster with M525 alarm  ( not usual M535 alarm in most US models)

Where is the alarm horn located?  It is not in the front trunk by the battery.  Car keeps popping alarm fuses

[Loren]

Porsche alarms were option on Boxster. M535 is the correct control unit.

The alarm horn should be down to the right of the battery and is just the horn. Sometimes it is hard to see.

[Porschelibrarian]

I agree but this one has different alarm module and no alarm near the battery

[JFP in PA]

35 minutes ago, Porschelibrarian said:

I agree but this one has different alarm module and no alarm near the battery

The M525 should be using part #996-618-262-03 control unit, which Porsche calls an "anti-drive off" rather than the more common M535 "immobilizer" system.  It should have a separate alarm horn mounted on a bracket near the battery ground cable:

 

[Porschelibrarian]

Here is similar photo from the car.  Please note the harness doesn't have connector for the horn.

[JFP in PA]

Try looking on the other side (passenger's side) of the battery, that is where they normally live........................

[JFP in PA]

OK, may have just been informed that on some years, it was on the driver's side, as shown in this video clip: Replacing Boxster alarm horn

[Porschelibrarian]

Thank you, however, there is no horn or connector  on either side of the battery or in frunk area infront of the windsheild.

[JFP in PA]

Look around for the connector that should be attached to it, that dangling in the open where it could short may just be the source of your short.