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Xc70 full beam not working

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Old Jul 23rd, 2019, 18:50   #11
green van man
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Quote:
Originally Posted by Gazdkw View Post
Well I'm not sure now.

I replaced the lamps with some other new ones I already had. Had the car running and the full beams in for around 5 mins. No problems. Tried flickering them on and off quickly for a few minutes and no problems. All worked fine.

Pulled up at the car park this morning. Thought I'd just try it once. Instantly heard the fuse go.
That sounds like a driver failing. My experiance of led lighting, intermittent fault on driver blows fuse, change fuse and light works but fault will reoccure, change fuse and light works aging for a bit then starts to blow fuse instantaneously. I belive there is a flash over in the driver which blows the fuse, this flash over gets worse every time the fuse is renewed untill the carbon track is permanent.
I change the driver after the second fuse these days unless I'm sure it's a driver fault when it gets changed imediatly.

I belive the cost of these units is considerable so a borrowed known working unit may be a way forward.

Paul.
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Old Jul 23rd, 2019, 19:47   #12
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Originally Posted by green van man View Post
That sounds like a driver failing. My experiance of led lighting, intermittent fault on driver blows fuse, change fuse and light works but fault will reoccure, change fuse and light works aging for a bit then starts to blow fuse instantaneously. I belive there is a flash over in the driver which blows the fuse, this flash over gets worse every time the fuse is renewed untill the carbon track is permanent.
I change the driver after the second fuse these days unless I'm sure it's a driver fault when it gets changed imediatly.

I belive the cost of these units is considerable so a borrowed known working unit may be a way forward.

Paul.
It's not a LED lamp. It's the 55w H7 which is not LED.

I did notice a notible clunk when the high beam did work and I operated the stork. Almost like a loud relay, unusually loud
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Old Jul 24th, 2019, 18:03   #13
green van man
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It's not a LED lamp. It's the 55w H7 which is not LED.

I did notice a notible clunk when the high beam did work and I operated the stork. Almost like a loud relay, unusually loud
Apologies I thought you had the bi xenons.

Paul.
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Old Jul 24th, 2019, 18:35   #14
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They're still not LED - the high beams are halogens, plus it moves the gate in the projector assembly to remove the dip cut-off.

Sounds really odd. I'm struggling to see what would cause an intermittent overcurrent or short, aside from a chaffed wire perhaps...?

cheers

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Old Jul 24th, 2019, 21:46   #15
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Just tried unplugging the lamps via the connector and a new fuse. Took the car for a drive and tried the stalk numerous times. Could hear the relay as normal. Even left it on for about 10 mins. All seemed well. I turned it off and left it. 10 mins later tried it and instantly blew the fuse.

Really struggling now with this. What components are online from the fuse to stalk to lamps?

Also one thing I thought was odd, if I unplugged the lamps shouldn't I have had a warning on the dash?
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Old Jul 25th, 2019, 00:46   #16
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I'm not sure the bulb monitoring will cover the main beams.

To be clear, the second time, it blew the fuse with the lamps still disconnected?

As a next easy step, I would track down the relay, remove it, and repeat the exercise. Beyond that, start isolating sections of wiring (start with the whole CEM-to-headlight run), and look for a short to ground using a multimeter in continuity (i.e. beep!) mode. You might need to leave it connected and go for a drive if it's a vibration-activated short.

cheers

James
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Old Jul 25th, 2019, 07:17   #17
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so where are the relays located? this seems to be the most obvious next point of inspection?
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Old Aug 2nd, 2019, 18:41   #18
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I would be looking at the CEM. I'm not exactly sure on a P3, but I'm sure Google will tell you. It's behind the dash on a P2.

cheers

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Old Aug 4th, 2019, 23:46   #19
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It's behind the glove box and also contains a bundle of fuses. You'll need to take the glove box out for proper access. Not that hard but a bit of a PITA.
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Old Aug 5th, 2019, 19:06   #20
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Thinking about it, I ought to have known it was there - I went looking for the fuel pump relay on my P3 a few months ago! (Spoiler alert: it doesn't have one, being a later model with the variable speed controller)

cheers

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