Alarm problems - Urgent
Alarm problems - Urgent
Author
Discussion

All2Chewy

Original Poster:

263 posts

229 months

Saturday 22nd October 2011
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Hi Everyone,
I realise it's saturday night and i am pushing my luck that someone can help me, but it's worth a try.

My key fob stopped working about two weeks ago and until I get a new key fob coded to the car, I have been using the manual method of unlocking and then jumping in the car and quickly starting it before the alarm goes off. This was a good temp. fix until tonight!

I lock the car using the key, turning it to the lock position, the lights dim and the car shuts down as usual with the flashing red light indicating that everything is fine, however after about 10-12mins, the alarm goes off and therefore I am unable to lock the car.

I have checked all the sensors, i.e. bonnet, centre console etc and they are all closed and locked fine. Besides I would get a beep or unusual flash from the red light if these had a problem (Wouldn't I?)

It was locked and alarmed all day today fine, and then I have driven 50 odd miles and parked up and now I am faced with this problem.

The car is a 996 C2, 2000 Reg. Any help would be really appreciated. Thanks!

All2Chewy

X-UFO

267 posts

219 months

Sunday 23rd October 2011
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Firstly check the alarm control unit under the passenger seat isn't wet.


One other thing that sets the alarm off is the tilt sensor. near to the battery. You can disconnect it.

To quote from another site Rennlist:

"Good news...problem solved !

Took Boxster to my friendly local OPC for new key fob and they kindly offered to take a look at possible common problem areas which can cause the alarm to be activated without apparent cause.

The problem was caused by the tilt sensor assembly that is located just to the right of and below the battery. The sensor assembly has a small reservoir that apparently is notorious for filling with water.

The friendly Porsche mechanic disconnected the battery negative (with key in ignition to prevent secondary battery kicking in) he then slackened the battery clamp and slid the battery along to give full access to the tilt sensor. He then disconnected the connectors to the tilt sensor and taped them up with electrical insulating tape. He then removed the fixing bolt holding the tilt sensor in place and completely removed the tilt sensor.

RECONNECTED BATTERY ..AND PROBLEM SOLVED

The friendly mechanic told me that there was a very early recall and upgrade to relocate this tilt sensor to a position inside the car so that it cannot flood, alternatively the car works just fine without the tilt sensor.

Car is now working great.....now that the car is fixed my wife tells me that she will now start to drive it ....BUMMER ..... WELL CAN'T EXPECT EVERY STORY TO HAVE A HAPPY ENDING

Many thanks folks for your help and support ...Happy Driving"



Edited by X-UFO on Sunday 23 October 00:19

All2Chewy

Original Poster:

263 posts

229 months

Sunday 23rd October 2011
quotequote all
Thanks X-UFO, however there has been no rain here for the last 48hrs+ and there is no dampness in either the Tilt Sensor or under the passenger seat, as mentioned it locked fine all day today and since the long drive home and parking it for the night this problem has appeared.
Thank you for your suggestions though.

Sunnysidebb

1,385 posts

198 months

Sunday 23rd October 2011
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Hold on a mo.You have said your Key Fob has stopped working, haven't you got 2 fobs. What about the second one. If you have one does that still work??
Have you had any Fault codes read out? The Alarm/CL module will generate fault codes for you to diagnose problems.

You can lock the car using the emergency locking mode, which is 3 sharp turns to the lock position in succession and the same to unlock. If you have an alarm fault this will allow you to lock the car without the alarm going off.

Richard Hamilton

525 posts

292 months

Sunday 23rd October 2011
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The emergency locking procedure Frank describes also disables the interior monitoring sensor. If the false alarms you have been getting are due to the sensor, they should stop.

_gez_

1,013 posts

225 months

Sunday 23rd October 2011
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It could be your car battery failing. When they go the alarm incorrectly thinks it has been disconnected and starts sounding. When it goes off does it go off continually or stop after 30 secs? If the former then I'm sure it is the battery.

All2Chewy

Original Poster:

263 posts

229 months

Monday 24th October 2011
quotequote all
Thanks everyone, used the emergency locking procedure, saw it in the manual, but was described using a key fob. Didn't know you could also turn the key three times, such a simple fix. Thank you to everyone for their input.

All2Chewy