Not to my car but a colleagues Astra H
He complained as to having no way of seeing that the doors were locked on his car and asked if a buzzer could be fitted instead. It couldn't have gone better
15 minutes later the job was done so now on deadlock the car gives a short beep with a longer beep on unlock
On a seperate note when drilling metal wear goggles. I was using a new step drill and had some hot swarf fly off and just catch me on my eye lid that gave me a shock, got a nice burn there now!