Electrical problems with volvo - no brake lights and also it gets stuck in overdrive by itself quite a bit. Father in law can fix all these problems if he could find the wiring diagram for this car, but I can't even find the repair manual (I've checked 3 different auto shops).
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Re: Need wiring diagram/chart for 1994 940
If you have no brake lights at all first check voltage in and out of brake light switch above pedel (not the one with vac line) if thats ok then pull the large red round bulb out senser behind the fuse panel and look for the bad solder connection inside it or just replace it/as for the od i think what you are saying is it gets stuck out of od and the engine revs high? the most commen problem is the od relay that is also behind the fuse panel (white ,tall,left side and square) but the best fix is to bypass it all on the trans with a kit from IPD.
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Overdrive (assuming it's manual) is controlled by a solenoid mounted on the overdrive unit (type P) itself. On the M46 transmission, it is mounted on the lower left side. That solenoid is controlled by a relay in the electrical console, behind the ashtray. These solenoids are a known problem with the M46 and many owners install an 'overdrive delete' cover in its place.
If you have an automatic, there is a relay in a similar position controlling a similar solenoid.
On either transmission, trace the wires from the transmission case to the interior and verify that they are not chafed or rubbing the body ground points.
I have a 2001 volvo v70 wagon. My lower brake lights are not working but my 3rd (top) brake light works fine. I replaced the bulbs checked my brake light relay checked all fuses and ground wire and all seems to be fine, but the lower brake lights still doesn't work. I need Help!
It coould be the brake light switch, the wiring or the bulb failure relay under the dash. You will need a test light and a wiring diagram to find the problem. If you can get someone knowledgable about cars to help you, I can send you a wiring diagram.
www.ipdusa.com sells the correct shop manual for the car. It is only available in the British publication, so you will need to look up metric conversion formulas, which are quite easy. I have this book, so you know.