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Fog lights turn on under braking?

Posted:
Sat Aug 01, 2015 12:16 pm
by hgn
Hi all,
Not sure what to say other than the above! When braking in my MY08 2.5i Liberty the fog lights turn on, foglight switch is on, headlights and parker switch off (so should stay off).
The foglights are LED ones, and brake lights are too except for the third light. Any ideas?
The headlight indicator on the dash turns on dimly as well when braking too. Could this be an issue with a bulb?
Thanks,
Will
Re: Fog lights turn on under braking?

Posted:
Sat Aug 01, 2015 9:11 pm
by Flat6Estate
Brake lights and rear parking lights have a minor short. Power to brake lights activates parking light circuit.
I bet it the fog switch was in the off position, the fogs wouldn't come on, but I bet the front parkers WOULD come on.
Change left hand brake light, and test, if problem still exists change right hand brake light. It will be one or the other or both. Use regular globes not LEDS when testing...
Re: Fog lights turn on under braking?

Posted:
Sat Aug 01, 2015 10:57 pm
by BillyCorgi
Sounds like an earth fault at one on the brake light bulbs?
Re: Fog lights turn on under braking?

Posted:
Sun Aug 02, 2015 7:49 am
by RX25SE
Sounds like your new stop/tail globes are feeding the park circiut with voltage when the brakes are applied.
Ill bet money that if you refit the std bulbs, all wil be good.
Re: Fog lights turn on under braking?

Posted:
Sun Aug 02, 2015 11:03 am
by hgn
Hmm, thanks all for the advice
I'll poke around. I figured something was up with the bulb i replaced. Had LEDs for a while, one blew recently and this started shortly (not instantly, mind you) after i replaced the blown bulb with an exact copy.
Re: Fog lights turn on under braking?

Posted:
Sun Aug 02, 2015 9:37 pm
by Gyro Gearloose
Is it a dual filament type? If it's inserted incorrectly it could be shorting the brake and park circuit