90 Quattro 20V (Canada) L5-2309cc 2.3L DOHC (7A) (1989)
Backup Lamp Switch: Locations
Gear Selector/Back-Up Light Switch (3-Speed Automatic Trans.)
Gear Selector/Back-Up Light Switch (3-Speed Automatic Trans.)
Switch should be closed (completing the circuit) only when the transmission selector is in Reverse position.