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C30 / S40 & V50 '04-'12 / C70 '06-'13 General Forum for the P1-platform C30 / S40 / V50 / C70 models |
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Hazards randomly come on..Views : 1346 Replies : 7Users Viewing This Thread : |
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Nov 19th, 2020, 14:15 | #1 |
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Location: Falmouth
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Hazards randomly come on..
The hazards on my 2010 V50 keep randomly coming on.
It seems like the most common answer is that the switch is faulty so I took mine out, completely stripped it down, blew the dust out the switch with compressed air, then squirted some fader lube in it and worked it in and out a load of times. Whilst it was all apart, I checked everything with the multimeter and I can see the switch operating perfectly. The resistance of the little bulb inside reads 22 Ohms, which seems a little low assuming it operates at 12v (would mean it draws over half an Amp), but I digress.. So I think to myself everything seems fine with the switch, I'll plug it back in and see what happens. As soon as the plug made contact with the connector in the car the hazards immediately started flashing. Pressing the button had no effect. Unplug switch, nothing happens. Plug switch back in and the hazards immediately stop flashing. Pressing the button still has no effect. It seems that the very act of plugging the switch in, makes the car think the button has been pressed. Which would imply to me that the switch connections have somehow become permanently connected together, but this is not the case as I have verified with the multimeter. The next thing I thought was maybe the bulb was somehow having an adverse effect on the whole system so I removed it (in just unscrews really easily), but this didn't change the behaviour at all, it was exactly the same. Has anyone ever seen this before, or could anyone offer an explaination of what's going on? I'm baffled. Cheers, John. |
Nov 20th, 2020, 02:53 | #2 |
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Last Online: Feb 23rd, 2024 21:48
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Has the pollen filter been replaced recently; hence CEM disturbed?
The reason I am asking is that my V50, 2012 suffers from electrical breakdown circa every six months (due to well documented design flaw in the connection of the CEM to the rest of the car). The latest manifestation of the poor connection in my car was fluctuating fuel gauge. However, I also had hazard lights misbehaving, wipers on, engine service message, brakes failure message, you name it. When I connected the car to VIDA, I would always get several COM errors. |
Nov 20th, 2020, 13:32 | #3 | |
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Quote:
Have you any other unusual function happening?
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My comments are only based on my opinions and vast experience . |
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Nov 20th, 2020, 21:37 | #4 | |
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Quote:
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Nov 20th, 2020, 21:42 | #5 | |
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What I can't fathom is why the switch works perfectly when tested with a multimeter, but not when plugged into the car. Apart from the error message on the dash I mentioned in my previous post, everything else on the car works perfectly. |
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Dec 12th, 2021, 19:52 | #6 |
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Update?
Hi
Did you manage to resolve this? I have exactly this problem now - curious what I can do about it! Many thanks Graham |
Dec 12th, 2021, 20:03 | #7 |
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Yes I did manage to resolve it. I took the car for an MOT and the switch was still playing up so the garage just ordered and fitted a new switch from volvo for about £20. No problems since then.
Still can't understand why it tested fine on the multimeter, but I haven't got time/headspace to worry about that now lol. |
Dec 12th, 2021, 20:21 | #8 |
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Great - will take it off to the garage to get that sorted then!
Thanks for the quick reply! Graham |
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