Quote:
Originally Posted by Rev Jules
Anyone with some sort of info on this please.
Rev
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From memory, so if someone's memory is more accurate?
There is a signal from the ECU, which indicates the engine is running. That passes through a thermal switch in the front bumper area which closes at <5C, that signal then passes to the FBH.
Net result is - FBH only comes on when engine is running and temperature is less than 5C. It comes on automatically in those circumstances.