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The mkiv Supra Owners Club

Does your brake stop relay click?


SUPRA4EVA

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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 

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  • 2 weeks later...

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 

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