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cannonballer
Join Date: Feb 2008
Posts: 3
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993 is false alarming. Where are the sensors located?
I have a 1995 993 Porsche C4 cab that false alarms every once in a while (like tonight). It’s annoying and embarrassing. This car has almost every option, tach/computer, 12 way seats, etc. Anyway I suspect that there is a motion sensor that is causing this. The problem is I have no idea where the factory sensor is to disable or replace it. I have searched the web high and low for its location or any information on the factory alarm. All I know is that the part number for the alarm (aka IMMOBILIZER in Europe) control is 993.618.159.01.
Thank you in advance.
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Porsche 993 C4 BMW 540i6 Sport |
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11-14-2008, 07:12 PM
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Registered
Join Date: Aug 2001
Location: Brighton UK since 11/2012
Posts: 3,170
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Run the vehicle systems on a Porsche tester ("Hammer" or Piwis) to show if there are any problems. The tester can run the alarm system and check operation.
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From November 2012; Precision Porsche Specialist Sussex UK, +44 (0)1825-721-205 2001-2012 Gerber Motorsport Inc. 206-352-6911 07.15.06 1996 Ducati 900SP. Suprisingly enough, it's red 08.16.09 1999 Kawasaki ZRX1100. Green. |
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11-15-2008, 07:39 AM
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Thom 993
Join Date: Sep 2012
Location: So. Cal.
Posts: 6
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If your '95 is the same as my '97, the motion sensor is in the compartment light above the windshield. Hood and engine compartment switches are in the latch assemblies that also turn on the light. The alarm unit looks for a contact closure. Those sensors have plugs that can be disconnected for testing. Glove compartment and door sensors work the same way. I'm not sure how the radio sensor is configured but there is one. Since all sensors are simple switches, radio unknown, just look at the lights they control. The mechanical switches are an unlikely source of trouble if the lights are working properly. Good luck.
Thom |
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11-15-2012, 08:21 AM
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Thom 993
Join Date: Sep 2012
Location: So. Cal.
Posts: 6
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PS, Running a scan of the electronics is a good idea and may save you a lot of hassle. My alarm started doing the same thing immediately after a smog test. It was suggested to me that a certain combination of ignition switch setting and a possible glitch when the analyzer was plugged into the system may have caused the problem. I haven't had time to get it scanned. Right now it's unlocked in the garage.
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11-15-2012, 08:29 AM
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