Remove/install heated seats control unit - AR91.30-P-0030MCU

MODEL 451.3/4 with CODE (S17) Seat heaters (FFO) 

Fig 1: Identifying Heated Seats Control Unit Remove/Install Component

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Adjust driver seat to the rear
2	Pull front HS [SIH] control unit (N25/5) out of its bracket
3	Install in the reverse order
4	Check proper operation of seat heaters