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Home >> Mercedes Benz >> 2002 >> SLK230 Automatic >> Repair and Diagnosis >> Restraints >> Seat Belts >> Seats, Restraint Systems -- 170 Chassis >> Basic Knowledge >> Convenience feature (CF) relay, location/purpose/function - GF91.29-P-4100LK

Convenience feature (CF) relay, location/purpose/function - GF91.29-P-4100LK

MODEL 170 with CODE (221b) Electrically adjustable driver and passenger seats 

Illustrated on vehicle with left-hand steering 

The CF relay (K24) is located between the jacket tube and the A-pillar.

Fig 1: Identifying CF Relay Module - Illustrated On Vehicle With Left-Hand Steering
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  Convenience feature (CF) relay, purpose The CF relay (K24) supplies the seat adjustment with power depending on the state of the door contact switch (S17/3, S17/4) and c. 15R.  
  Convenience feature (CF) relay, function The relay links the signals from the two door contact switches and c. 15R via an OR function. If at least one door contact is not under power (e.g. door open) or c. 15R is ON the relay contact closes.
IMPORTANT When the door is open the door contact signal is connected to ground via the door contact switch.		  
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