Car will not start and central locking not working properly volvo 850 Sometimes the doors lock when driving. Ihad to take the central locking fuse out because when I tried to start the car the doors would lock and the car wouldn't turn over, just lights on the dash. When the car doesn't the electric fan won't turn on, when this happens I know it won't start. The other day I was driving and the doors locked and the car just died. I took the fuse out and at first it didn't start jiggled the keys a bit and then luckily it started. I have had it towed twice to the electrical shop and then when it gets there it works. I have looked at the anti theft relay but it seems that I already have the dummy 210 installed. Could that be faulty? Also when the car doesn't start the windows won't work properly, like very slowly.

SOURCE: Central locking on volvo 850 1996

Happened to me after first purchasing my 850 - check the fuse for the CLS, as mine (for some reason) was too narrow, and was jostling about. Once I changed it out for a new fuse, no problems at all (I performed this fix a year ago, and no problems since).

SOURCE: REAR DOOR LOCK

you either have a faulty central locking motor or the wiring harness may be damaged.
Remove the door panel and check if you have a live feed to the central locking motor when you use the fob to lock or unlock. If you have power, then it will most likely be the motor that is at fault.

SOURCE: interior electrical problem

apply for ALDATA on the internet ,its only like 25 bucks and you will be surprise how much information you can get you would not need a mechanic again

SOURCE: Alarm haywire, can't override anti-theft system or turn on car

The Alarm on my Mercedes ML320 sounded every night, then it started doing it more often, Showed it to the dealer he says it's the 'Tow Sensor', that needs to be repaced. $700, down the drain. I have already started hating this car, it eats $500-600, every 6 months...

SOURCE: auto door locks 200 volvo S70

You may have a bad master door swith assembly or more fuses out.