SUPRA4EVA Posted October 23, 2024 Share Posted October 23, 2024 So this has been annoying me since I got the car...rear brake lights make a really loud clicking noise coming from NS rear when the brake lights come on. Is this normal for this car? Quote Link to comment Share on other sites More sharing options...
jagman Posted October 23, 2024 Share Posted October 23, 2024 No - there are no brake light relays and none in the rear of the car - there is a bulb failure unit but it is transistor operated and silent . Probably someone has added a relay for rear fog lights or such and it’s being operated by the brake voltage - bad shared earth or such . I can only post a couple of times a day for some reason so help will take some time - lol Page 114 of the electrical diagrams Quote Link to comment Share on other sites More sharing options...
SUPRA4EVA Posted November 3, 2024 Author Share Posted November 3, 2024 Well mine is UK so has rear fogs...strange sounds like one, I might have to remove the trim at some point to see where it's coming from as it's really annoying Quote Link to comment Share on other sites More sharing options...
jagman Posted November 3, 2024 Share Posted November 3, 2024 The brake light switch provides 12 volts to the brake lights direct … and then to earth . If the earth has been shared with another circuit (with relay added ) could be fog or antenna or fuel pump or subwoofer or whatever has been added with a relay . Then if the brake light earth is high resistance (loose or corroded ) the voltage can now go down the earth wire of whatever shares the earth backwards to the relay which may then click if the voltage is high enough - it would take less than 2 mins to find the relay . The only other thing is the bulb failure unit 1 Quote Link to comment Share on other sites More sharing options...
Probby Posted January 31 Share Posted January 31 As others have said, probably a relay used for feeding the fog lights - if you can find it you can remove the whole lot and replace with a diode and a clean 12v feed from somewhere. That or add a diode to the relay so the back current from the brakes being switched on doesn't turn the relay on ... 1 Quote Link to comment Share on other sites More sharing options...
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