That's what I would like to find out @andyfreelandy, if that light influences anything in the electronics, because I would have thought it's just an indicator, when the handbreak has been applied.
From memory, if ABS is fitted, then the ABS ECU controls the HB light, as its used to warn of for other issues too.
If no ABS is fitted, then the HB connects straight to the Ipack warning light instead.
 

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