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Why would the brake lights on a 1994 Volvo 940 wagon stop working when the bulbs and brake pedal actuation switch are OK and there is no bulb failure warning light on the instrument panel?
Wiki User
∙ 12y ago
The fault will be in the wiring but could be anywhere from the fuse board onwards. The bulb failure light system works by comparing to indentical systems, in this case the right & left brake lights. If the electrical current flowing to each build is significantly different the waring light comes on , ie one light is working and the other is not. If problem affects both lights this will not trigger the warning as the current to both lights is the same, zero.
Check the fuse, the wiring between the fuse board, actuation switch and bulb failure unit and bulb failure unit its self. The build failure unit is actually a set of detectors in one unit so it is possible that the brake circuit part has a fault while the rest continues to work normally.
david@roulson.freeserve.co.UK
Another Idea: I fixed that problem by removing the orange colored sensor (from the relay box) to diagnose it. I took it apart (probably needlessly) but realized that the pins had invisible non-conductive corrosion on them so I sanded the pins. Then the brakes work. So just sand the pins and replace the sensor. No need to disassemble as I did.
Wiki User
∙ 12y ago
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