Remove/install heated seats control unit, head area ventilation and steering wheel heater - AR91.30-P-0032V

MODEL 171.4 with CODE (403) Airscarf system with CODE (443) Steering wheel heater with CODE (873) Right and left front seat heaters 

Fig 1: Identifying Heated Seats Control Unit Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Completely open Vario roof	See Operator's Manual
2	Move right front seat forwards and tilt backrest forwards	See Operator's Manual
3	Open clip (1) at backrest and unhook seat belt (2)
4	Release rear paneling (3) at bottom and fold upwards	Installation:  Ensure that the Velcro strip (4) is properly seated.
5	Separate electrical connector (5)	Number of electrical connectors (5) depends on equipment
6	Unscrew nuts (6)
7	Remove front HS [SIH], AIRSCARF and steering wheel heater control unit (N25/7) from vehicle
8	Install in the reverse order