My first post, so hello.
Cruise control on my Volvo S80 suddenly won't work. There's no cruise light so I doubt it's the brake pedal switch or anything that switches it off while in operation.
I'd like to check fuse, relay, etc but I've no circuit diagram. Can anyone help? And am I on the right track?
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do you have an error message showing?
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Don't discount the pedal sensor. When my S60 was still young enough to be under warranty, there would be days when the CC wouldn't engage at all - pressing the master button on the wheel wouldn't even illuminate the Cruise light. Other days it would be fine, but once the CC had failed to engage once, it wouldn't work again until I'd stopped and restarted the engine.
Can't remember now if it was the brake or clutch pedal sensor that caused it (there was also a problem where pressing the clutch pedal would illuminate the brake lights) but whichever it was was replaced under warranty and neither problem has recurred.
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It is often the clutch position sensor. Sometimes they just fail or sometimes the brake master cylinder is leaking onto it. If it detects a fault it disables the cruise control until you restart and sometimes brings on the "Engine System Service" message as well.
The part is about £35 IIRC and is pretty easy to fit yourself but you might need to get a Volvo dealer to fault code read the car to verify that is the problem.
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