Hi. My son and I have been working on his 92 240. Mechanical and paint have all been reworked over the last few years by a Volvo specialist but now we have encountered simultaneous shift lock, central locking, and power window failures. Fuses are all good. Any thoughts?

 

There are relays, secondary fuses, shift lock is a pain, etc. Did it all happen at once? I'm not big on 240 electrics, there are components all over. Grab a multi meter, get to it.

 

first thing to check is the last thing that was worked on when these failures occurred. maybe a ground got disturbed.

those are three rather disparate circuits without much in common. power locks work without ignition, while the other two are tied to the ignition.

whats the failure mode of the shift lock? will it simply not shift out of park at all? or will it not start in park or neutral?

what lev said, the 240 wiring is rather random, with components in all sorts of odd places. I would get the greenbook 240 wiring diagrams for your year, and trace each circuit with a volt meter and/or test light to determine why its not functioning.