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I've been plagued with the alarm going off occasionally when I leave the car locked. Having narrowed down the problem to the bonnet switch I decided to have a look-see and fix it.
It's an easy fix.
It's an easy fix.
- Pop the bonnet and remove the drivers side headlamp unit.
- Close the bonnet and lock the car.
- Locate the bonnet switch; it's up there under the bonnet latch.
- Like me you'll probably find the lightest touch on the bonnet switch will set your alarm off, or the horn will go off when you try to lock the car.
- Remove the plug from the back of the switch assembly (fiddly)
- Depress the two recessed lugs on the front of the switch assembly and remove it (fiddly)
- Mine was full of road dust / mud / whatever. I cleaned it with MAF cleaner 'cos I had some left over.
- I then opened the spring so it stood a little bit proud of the top of the switch assembly.
- Reassemble back to bullet point 4. The alarm should NOT go off when you wiggle the switch assembly.
- Refit the headlamp unit.
- Wonder how long your fix will last.