Electrical seat adjustment (except CODE 275) - GF91.29-P-0009CE

MODEL 204.0 /2 except CODE (275) Memory package (driver seat, steering column, mirrors) as of model year 2009 /YoM 08

MODEL 204.3 except CODE (275) Memory package (driver seat, steering column, mirrors)

MODEL 204.9 except CODE (275) Memory package (driver seat, steering column, mirrors)

Fig 1: Electrical Seat Adjustment Function Diagram

Courtesy of MERCEDES-BENZ USA

Function requirements, general

Circuit 15R On or
Run-on active

The electronic ignition lock control unit sends the status of circuit 15 via interior CAN to the rear SAM control unit.

Run-on:

If circuit 15R was switched off, the electrical seat adjustment (ESA [ESE]) can still be operated for t = 3 min. If a change in the circuit status or in the door status occurs during the run-on time, the run-on function begins anew.

The door status is sensed by the left front door lock and right front door lock. The corresponding status is read in by the left front door control unit or right front door control unit, which transmits the status via interior CAN to the rear SAM control unit.

Electrical seat adjustment (ESA [ESE]), general

The ESA [ESE] enables the electrical adjustment of the driver and front passenger seat. The driver and front passenger seat can be adjusted as follows:

Seat height
Backrest angle

Also with code (494) USA version:

Seat fore/aft position
Seat inclination

The ESA [ESE] comprises the following partial functions:

Function sequence for driver seat adjustment
Function sequence for front passenger seat adjustment
Function sequence for antilock device

Function sequence for driver seat adjustment

For the seat adjustment of the driver seat, the corresponding position in the driver seat partially electric seat adjustment switch must be pressed and held, which directly actuates the corresponding set adjustment motor directly:

Driver seat height adjustment motor
Driver seat backrest inclination adjustment motor

Also with code (494) USA version:

Driver seat fore/aft adjustment motor
Driver seat inclination adjustment motor

Function sequence for front passenger seat adjustment

For the seat adjustment of the front passenger seat, the corresponding position in the front passenger seat partially electric seat adjustment switch must be pressed and held, which directly actuates the corresponding set adjustment motor directly:

Front passenger seat height adjustment motor
Front passenger seat backrest inclination adjustment motor

Also with code (494) USA version:

Front passenger seat fore/aft adjustment motor
Front passenger seat inclination adjustment motor

The power supply for the seat adjustment motors is supplied by the rear SAM control unit directly via the respective seat adjustment switch.

Function sequence for antilock device

Anti-lock protection is provided by a thermal fuse in the set adjustment motors. As a result, if the seat adjustment motor is blocked, it is not switched off until exceeds a certain temperature threshold.

	Electrical function diagram for seat adjustment (ESA [ESV])	PE91.29-P-2050-97FAB
	Overview of system components, electric seats	GF91.29-P-9992CE