When I bought my car, the door locks were defunct. I have now replaced the master vacuum switch in the drivers door.

If all was well in mudville, I believe the doors would lock when the car was either started or put in gear, and unlock when the drivers door was opened. Am I right?

It would help to know what vehicle you're asking about. The older cars are vacuum controlled and do not respond to engine or trans inputs.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

If you are talking about your 81 240D, no.

On that car, doors lock when you lock the driver door, and unlock when you unlock the drivers door.
Also the fuel door and trunk will follow.

For this to work, none of the vacuum lines can leak, nor can any of the actuators...
Also the yellow line needs to be connected to the vacuum pump...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

^Agreed. No auto lock on these cars when the key is turned.

On new cars, this is normal and in my mind, unwanted.

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83 SD

84 CD

Thanks guys. This gives me a target to fork towards!

I had that on the Prius I rented on my last business trip. It was quite annoying.

New slang or an interesting typo?

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

Auto-correct auto-mistaked. I hate typing on a phone. Sorry.