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Old 9th February 2022, 12:42   #1
Simmons
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Default Fog light problem

Hi Guys, hope everybody is safe and well


I replaced my mk1 160 last September with a 54 plate mk2 190, when i bought it the seller did say he had to remove the fuse for the front fogs as they would not turn off.


I decided it was no major problem, i will look at it when i can, today as i was replacing the sidelight bulbs i thought ill have a look at the fogs, thinking it may just be the dashboard switch


Replaced the fuse and they came on straight away, no ignition key in, lights not turned on at all so in theory no power should be going to them.


Good news is theye work (haha) bad news is with the fuse in they work all the time even when the car is jst sat there, any ideas?
Footnote every other light works absolutely fine



Also whoever on here (sorry cannot remember) posted to get a long pair of curved surgical forceps to replace the sidelight bulbs, neatly tucked away below the H9 bulbs needs a medal, why i have never thought about it before ill never know
However i have no idea how i am going to get into the near side one as the power steering reservoir is in the way even if you try to go through the wheel cover.


Thanks in advance
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Old 9th February 2022, 13:26   #2
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I would check the fog light relay first, check the contacts haven’t welded themselves together.
Failing that, it’s probably going to be a fault with the Light switch module.
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Old 9th February 2022, 15:16   #3
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There shouldn’t be any power to the relay with the ign switched off, I would check the wiring underneath the underbonnet fusebox as well.
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Old 9th February 2022, 20:42   #4
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Easiest way to change bulbs, is to remove the bumper and headlight, doesn't take long at all. And if you fit lpg bulbs in the sidelights, they last much longer.
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Old 9th February 2022, 22:29   #5
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Quote:
Originally Posted by StewartIngram View Post
Easiest way to change bulbs, is to remove the bumper and headlight, doesn't take long at all. And if you fit lpg bulbs in the sidelights, they last much longer.



Thanks for the replies folks, was really trying not to remove the bumper just for one little side light


Will check the relay for the fogs although the fact that they are on even without power is worrying


I thought about getting a 2nd hand headlight switch to try, guessing it isnt the control module as everything else works so hopefully just a dodgy switch
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Old 10th February 2022, 08:17   #6
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Quote:
Originally Posted by trikey View Post
There shouldn’t be any power to the relay with the ign switched off ...
Andy, the front fog lamp relay contacts aren't controlled by the ignition switch.
Quote:
Originally Posted by Simmons View Post
... i have no idea how i am going to get into the near side one as the power steering reservoir is in the way ...

The PAS reservoir is on the offside on a KV6 Shaun. It's the air cleaner intake ducting which obstructs access to the NSF lamp unit, at least on a Rover it does so I imagine that your MG is similar.
Quote:
Originally Posted by bsafly View Post
I would check the fog light relay first, check the contacts haven’t welded themselves together.

It would be unusual for a relay to fail in this way but this has to be your first port of call.

Replacing the headlight switch isn't going to help because the front foglamps are not controlled by that. Besides, all the switches are part of the lighting switch module (LSM) which is configured to your particular car.

Simon
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Old 10th February 2022, 11:41   #7
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Quote:
Originally Posted by SD1too View Post
Andy, the front fog lamp relay contacts aren't controlled by the ignition switch.


The PAS reservoir is on the offside on a KV6 Shaun. It's the air cleaner intake ducting which obstructs access to the NSF lamp unit, at least on a Rover it does so I imagine that your MG is similar.


It would be unusual for a relay to fail in this way but this has to be your first port of call.

Replacing the headlight switch isn't going to help because the front foglamps are not controlled by that. Besides, all the switches are part of the lighting switch module (LSM) which is configured to your particular car.

Simon

I didn’t say the contacts were powered Simon!
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Old 11th February 2022, 08:47   #8
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Quote:
Originally Posted by trikey View Post
There shouldn’t be any power to the relay with the ign switched off ...
Just to avoid any confusion the front fog lamp relay has a permanent feed from the battery to the contacts. So with the ignition switched off the contacts will still be live. This is the condition referred to by bsafly in the preceding post.

Andy is thinking of the relay coil circuit which is controlled by the lighting switch module in response to operation of the front fog lamps switch and should not be live with the ignition switched off.

I hope this clarifies.

Simon
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Old 11th February 2022, 12:27   #9
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Quote:
Originally Posted by SD1too View Post
Andy, the front fog lamp relay contacts aren't controlled by the ignition switch.


The PAS reservoir is on the offside on a KV6 Shaun. It's the air cleaner intake ducting which obstructs access to the NSF lamp unit, at least on a Rover it does so I imagine that your MG is similar.


It would be unusual for a relay to fail in this way but this has to be your first port of call.

Replacing the headlight switch isn't going to help because the front foglamps are not controlled by that. Besides, all the switches are part of the lighting switch module (LSM) which is configured to your particular car.

Simon
KV6.jpg


Without wanting to start an argument, according to Haynes and everyone else, that (circled) is a power steering reservoir, which is up against the rubber dirt boot covering the nearside H9 and sidelight access, the offside has plenty of room between it and the air filter box.



All i wanted was a bit of advice, as usual on forums, asking is the worst thing you can do
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Old 11th February 2022, 13:38   #10
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Quote:
Originally Posted by Simmons View Post
Attachment 86637


Without wanting to start an argument, according to Haynes and everyone else, that (circled) is a power steering reservoir, which is up against the rubber dirt boot covering the nearside H9 and sidelight access, the offside has plenty of room between it and the air filter box.



All i wanted was a bit of advice, as usual on forums, asking is the worst thing you can do
Simon is correct, at least in this instance. In the uk, near side is near side to the kerb, off side is well the other side lol.

If the relay theories dont pan out, check the wiring and the plug behind the bumper on the left side (sorry bumper off to check the wiring). I am not sure if any fog light wiring passes over the chassis legs, but these are prone to damage.

Of course the other solution would be to take it to an auto spark, who could stand in front of it and diagnosis it properly.

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Last edited by clf; 11th February 2022 at 13:45..
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