Car alarm constantly going off!!!

K

k.leeming

Member
My alarm is randomly going off. I cannot figure out for the life of me where the problem is. It's gone off:
At work parked up flat road. Sun and very windy.
At home on a very steep hill parked up in first gear. Sun and dry.
At home on a not so steep drive parked in first gear. Sun and dry.
At a friends house parked up flat road. Snow and ice.

I covered what I thought was the car alarm sensor under the rear view mirror with gaffer tape just incase a bug was on the inside. Still went off.

Is that the sensor for the alarm?
If not where is the sensor?

I had a tech2 ( the machine that plugs into the cars memory and reads for faults) within this time frame and it didn't show up any faults for the alarm. Only a airbag fault.

I'm stumped.
 
I had this issue too.... was my bonnet sensor/switch, just disconnect the the switch and set the alarm, if no alarm bells then its ya switch :P
I removed mine, cleaned/soaked it with electrical contact cleaner, refitted been fine ever since :thumbsup:
Think they must get dusty over time :x
 
You can disable the 'ultrasonics' by doing a long press on the lock button after the initial short press. The 'clown nose' should flash once on the first press and then illuminate for a couple of seconds whilst you're holding the button on the second press.

May not ultimately solve the problem, but it seems to stop mine going off when it occasionally gets into a fit.
 
if you know someone with DIS software (bmw dyanostic) then it will tell you what is causing the fault.
 
mac27040 said:
if you know someone with DIS software (bmw dyanostic) then it will tell you what is causing the fault.
Click to expand...

Thank you all for your suggestions.

I've had it plugged in during all this due to a airbag sensor going off and the bloke didn't see this error.

Long story short I'm a newbie with disconnecting stuff. Can I disconnect without software?

Kane
 
k.leeming said:
mac27040 said:
if you know someone with DIS software (bmw dyanostic) then it will tell you what is causing the fault.
Click to expand...

Thank you all for your suggestions.

I've had it plugged in during all this due to a airbag sensor going off and the bloke didn't see this error.

Long story short I'm a newbie with disconnecting stuff. Can I disconnect without software?

Kane
Click to expand...

You can disconnect bonnet sensor but tilt sensor is not easy to get too.

If your bloke is running DIS v57 then he should read memory for alarm, it doesn't throw fault codes up but stores what cause alarm to go off. This will tell you what is wrong.
 
Disconnected my bonnet switch sensor last week because of the exact same problem. Simply unplugged it and the false alarming has gone away. Like yours, the alarm seemed to go off very randomly.

DIS said "hood" error.

I used a multimeter on the switch sensor and it seemed to be doing something but obviously not enough.
 
I had this problem too. I disconnected the lead to the bonnet sensor, with the car turned off, and I haven't had a nuisance car alarm since.
 
I'm also experiencing similar issues particularly after washing the car water on sensors perhaps?
 
My e85 has to be parked on a steep slope and the alarm has started to go off, I disconnected the bonnet sensor and I'm hoping that's the problem, but just in case.. How do I sort the tilt sensor which would be the likely suspect in my case.
 
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