Kind of a silly two part question here. Part one is like the title says: What tells a F/AWD car it's driver's door is closed? Part two: Is there an easy way to disable the door chime without screwing up things like the interior lights?

I ask because I have a relatively new to me '98 XC 70 that is having a hard time believing you've shut the door after you've gotten in the car and put the key in the ignition. It seems to be getting worse (wife reports re-opening and re-closing the door three times this morning before it stopped chiming). I don't see anything obvious on the door frame like the little push contact pins the 240s have. ...And when the car finally admits that the door is closed there is what sounds like a solenoid (or maybe a relay?) actuating within the door itself.

Do I really have to take the door apart to fix this thing? How in the world does this system work?

Thanks for any insight!

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'68 220; '88 & '92 245s; '98 XC 70