Quote:
Originally Posted by dgacampbell
Nice one, just the switch at the top of the break pedal i assume your on about??
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Yup. I don't know where the controller is on the 90, but on most cars of the era it's in the boot on the left, sometimes screwed to the rear of the C-pillar root.
Part 857 919 471 controls/monitors the rear lights and brake lights - there's a special version of this for the central brake light; 443 919 471B
I presume this latter extends checking to the central light, but if it's enough for you that the two at the side are checked, then you need to wire into the brake circuit upstream of 857 919 471. Check for a 1.0mm red/black wire that goes live when the brake pedal is pressed.