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E46 Central Body Electronics

E46 CONVERTIBLE SEAT MEMORY SYSTEM

Purpose of the System:

The seat memory system uses two control modules on each front seat (driver and pas-

senger). One processor is incorporated into the seat adjusting switch and a second

processor is mounted under the seat. The functions of the two control modules is to

process the following inputs and outputs to control the seat:

• Seat adjustments

• Comfort entry aid switch

• Seat back rest lock micro switch

• Seat belt fastened

• K-bus communication with the GM V and Instrument Cluster

As with previous systems, the Driver seat memory feature stores three seat positions for

recall. The positions are stored in the non-volatile memory preventing loss of positions in

case the SM or the battery is disconnected.

Components of the System:

Refer to the Driver’s and Passenger’s memory seat IPO.

System Operation:

The seat adjusting switch block communicates with the control module over dedicated

lines. The output stages for seat motor movement are in the control module. The seat posi-

tions are recognized through the use of hall sensors on the motors. All components of the

seat memory system are monitored for faults.

Additional functions of the memory system include memorizing the position of the seat and

headrest when the entry aid feature is activated. The seat will return to its previous set posi-

tion when the entry aid switch is pressed rearward or the seat back rest is locked.

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ACTi E46 Manuale Utente Pagina 63