Headlights came on, drove aprox. mile realized headlamps weren't on. Next morning turnsignals weren't working. Brights, hazards other lamps fuctional. Already tried new dimmer switch, any suggestions.

 

Likely the main light switch. You might be able to take it apart and find it broken inside.

 

Would help to know what year and model car, there's some variation in the wiring over the 25 years 240s and 940s were made.

 

Soory bout that--1991 240 wagon

 

I'd probably arm myself with the wiring diagram and a digital multimeter, and start testing things. so only the low beams are out, and the turn signals, everything else works? that sounds odd.

 

thats the jist of it. Fog lamps didn't come on, thinking that ties in with headlamps. Cruise works. Do you know if the wiring diangrams are available on-line?

 

front fogs are typically connected via a relay so they only work with the lowbeams are turned on. the 240 rear fog is on its own circult, gets its power on a white-blue wire from the headlight switch, goes through fuse 14, then through the rear fog switch then a violet (or white?) wire to the rear fog on the left side only.

there are SOME wiring diagrams but not for every year and mostly for older versions. There are wiring diagrams in the back of the Bentley 240 book, but they are very hard to read, and the whole car is on 2 pages. the best diagrams are the 'greenbooks' from Volvo. US model 1991 240 wiring is greenbook TP31767/1

I've got /all/ the 200 (and 900) wiring diagrams on a couple DVDs that I bought from VCOA, but they are very copy protected such that I can't even snag a page to post.

let me look at this and see what I can see. if the high beams work, then at least some of the circuitry can be eliminated as its common.

power goes from the battery to the "positive terminal" to the 'step relay'. it also goes fromt he positive terminal to the ignition switch, and from the ignition switch it goes to the light switch and to the 'main headlight relay'. from the main headlight relay, it ALSO goes to the step relay, this is so you can flash the highbeams even when the car is off, but you can't turn them on normally without car power (confusing, eh?) The step relay is up on the left fender well or behind the headlights. the main headlight relay is tucked under the dash on the drivers side.

hmm. the low beams and the turn signals go from the step relay through the 'bulb failure detection' module, which is a redbull can sized cylinder tucked up under the dash on the far left side. often they are red on the outside but I dunno if thats 'always'. the fact that your high beams work means the power is getting to the step relay so we can ignore everything before that.

low beam output of the step relay is a green wire from pin 56B that goes to pin 6 of the bulb failure detector. a seperate blue wire for each lowbeam comes from the bulb failure can, pin 2 is the left, pin 7 is the right. the highbeams are connected directly to the step relay pin 56A via a red wire, there's also a red-white wire on 56A that goes to the high beam indicator on the dashboard..

phew, the turn signals look a little complicated to describe because the E-flashers override it. wait, you said the emergency blinkers DO work, but the turn signals don't? only thing different is the turn signal switch on the steering column, which is also the low beam selector. hmmmmm. yellow is 'common' and goes to pin 49A. left is L and goes to blue-green, while right is "R" and goes to blue. the high/low beam control is pin 31B, brown wire, and the turn signal switch has to be grounded via its mounting.

 

Thanks, this is a huge help let you know the out come