What would cause this?

75c · 24th November 2018, 02:55

Anybody tell me what would cause a car to suddenly start to have the front fogs on permanently?

It's not one of mine, it's my sister's 1.8. The plenums are dry, there's no flooding and no water.

Removing the fog light fuse turns them off, replacing the fuse doesn't. My only thought was a drowned ecu, but thats not it.

Les4048 · 24th November 2018, 04:28

Maybe not the correct answer but have you tried disconnecting the battery for a while and everything will reset itself

T-Cut · 24th November 2018, 08:57

The fogs fitted as accessories are switched on via a relay in the underbonnet fusebox. Maybe worth checking/swapping that?

TC

Lovel · 24th November 2018, 09:03

Quote:

Originally Posted by 75c

Anybody tell me what would cause a car to suddenly start to have the front fogs on permanently?

It's not one of mine, it's my sister's 1.8. The plenums are dry, there's no flooding and no water.

Removing the fog light fuse turns them off, replacing the fuse doesn't. My only thought was a drowned ecu, but thats not it.

On a completely bone dry car, I found that a faulty LSM caused the fogs to remain on. Probably one of the relay switches inside it stuck on due? Once changed out was all good.

75c · 25th November 2018, 22:59

Thanks, it was the relay

24th November 2018, 02:55	#1
75c Gets stuck in Rover 75 Saloon Join Date: Feb 2018 Location: Belfast Posts: 601 Thanks: 150 Thanked 294 Times in 190 Posts	What would cause this? Anybody tell me what would cause a car to suddenly start to have the front fogs on permanently? It's not one of mine, it's my sister's 1.8. The plenums are dry, there's no flooding and no water. Removing the fog light fuse turns them off, replacing the fuse doesn't. My only thought was a drowned ecu, but thats not it.

24th November 2018, 08:57	#3
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,751 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The fogs fitted as accessories are switched on via a relay in the underbonnet fusebox. Maybe worth checking/swapping that? TC Last edited by T-Cut; 24th November 2018 at 09:23..

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24th November 2018, 04:28	#2
Les4048 This is my second home Rover 75 Tourer/ MG ZT-T 400 Join Date: May 2012 Location: Lhanbryde Posts: 3,277 Thanks: 2,627 Thanked 1,523 Times in 869 Posts	Maybe not the correct answer but have you tried disconnecting the battery for a while and everything will reset itself

25th November 2018, 22:59	#5
75c Gets stuck in Rover 75 Saloon Join Date: Feb 2018 Location: Belfast Posts: 601 Thanks: 150 Thanked 294 Times in 190 Posts	Thanks, it was the relay