GUIDE : Alarm troubleshooting

JSeaman · Aug 28th, 2007, 08:10

I'm currently trying to investigate why my alarm tends to go off at random intervals. So far I've been told that the micro switch under the bonnet is a possible suspect so cleaned it up this weekend. Other investigation will include checking the battery voltage and possible investigating in an OBD II reader to determine the last 10 causes of the alarm going off. I'll update this thread as I try more things.

Step 1 - Pop the bonnet open and have a look at the retaining mechanism at the front

Step 2 - You should see a long thin strip of metal that actuates a microswitch when the bonnet is closed, this is suspect #1 for the alarm woes

Step 3 - The wiring for the connector is sealed with some kind of potting material so you can use some carb cleaner (or similar) to shift some of the muck that builds up on the switch (an old toothbrush would be just as effective but be delicate)

Step 4 - With the switch mechanism nice and clean you should have good visibility and be able to make sure the metal strip is straight and correctly operates the switch.

mark lee · Dec 28th, 2013, 11:09

Found my switch bent up the oppersit way to what it's in the photos here,
Good clean up put back in position, seems it fallen out and turned it self round

Dec 28th, 2013, 11:09	#2
mark lee Member Last Online: Dec 30th, 2020 19:00 Join Date: Oct 2013 Location: chippenham	Found my switch bent up the oppersit way to what it's in the photos here, Good clean up put back in position, seems it fallen out and turned it self round __________________ 2001 Y reg volvo v40 T4 TURBO. Last edited by mark lee; Dec 28th, 2013 at 12:42.

Aug 28th, 2007, 08:10	#1
JSeaman Senior Member Last Online: Oct 20th, 2013 20:24 Join Date: Aug 2007 Location: Derbyshire	GUIDE : Alarm troubleshooting I'm currently trying to investigate why my alarm tends to go off at random intervals. So far I've been told that the micro switch under the bonnet is a possible suspect so cleaned it up this weekend. Other investigation will include checking the battery voltage and possible investigating in an OBD II reader to determine the last 10 causes of the alarm going off. I'll update this thread as I try more things. Step 1 - Pop the bonnet open and have a look at the retaining mechanism at the front Step 2 - You should see a long thin strip of metal that actuates a microswitch when the bonnet is closed, this is suspect #1 for the alarm woes Step 3 - The wiring for the connector is sealed with some kind of potting material so you can use some carb cleaner (or similar) to shift some of the muck that builds up on the switch (an old toothbrush would be just as effective but be delicate) Step 4 - With the switch mechanism nice and clean you should have good visibility and be able to make sure the metal strip is straight and correctly operates the switch. Last edited by JSeaman; Aug 28th, 2007 at 08:20.

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