GF46.15-P-2001CE Easy Entry/Exit, Steering Column Adjustment, Function

GF46.15-P-2001CE Easy entry/exit, steering column adjustment, function
- with CODE (275) Memory package (driver seat, steering column, mirrors)

Function requirements, general
^ An easy entry/exit is activated via the instrument cluster (A1)
^ Drive position stored

The easy entry/exit function can be activated or deactivated in the instrument cluster via the "Settings" menu in the "Comfort" submenu. The required item is selected using the left multifunction steering wheel button group (S110). The signals from the multifunction steering wheel button group are read in by the steering column tube module control unit (N80) via the steering LIN (LIN E1) and sent to the instrument cluster via the chassis CAN (CAN E). The instrument cluster sends the status of the easy entry/exit function to the driver seat control unit (N32/1) via the interior CAN (CAN B).

Function of easy entry/exit/steering column adjustment, general
The easy entry/exit function makes it possible for the driver to get in and out of the vehicle easily. In the process the steering column is moved upwards before getting in or out. The steering column is adjusted and the current position of the steering column is stored by the driver seat control unit by actuating the steering column up/down adjustment motor (M20/2).

The function easy entry/exit steering column adjustment is comprised of the following partial functions:
^ Move to easy entry/exit position function sequence
^ Move to drive position function sequence
^ Repeat limiter function sequence
^ Function sequence for crash-active easy entry/exit function (as of 1.6.09)

Additional function requirements, approach easy entry/exit position
^ intentionally leaving the vehicle by removing the transmitter key (A8/1) from the electronic ignition lock control unit (N73)
^ Driver door opened

Move to easy entry/exit position function sequence
Before the steering column is moved to the exit position, the driver seat control unit stores the current position of the steering column (driving position) so that the steering column can be moved back to its initial position again after the adjustment process. The status of circuit 15 is placed on the interior CAN by the electronic ignition lock control unit.

The status of the driver door, defined by the status of the left front door rotary tumbler switch (A85s1), is placed on the interior CAN by the left front door control unit (N69/1).

The driver seat control unit reads in all relevant information and actuates the steering column up/down adjustment motor accordingly.

Move to drive position function sequence
After the driver has got into the vehicle, the steering column is moved back to the drive position.

The driver seat control unit actuates the steering column up/down adjustment motor under the following conditions in order to return the steering column to the drive position:
- The driver door is closed with circuit 15 On
- A change is made from circuit 30 to circuit 15C with the driver door closed
- A change is made from circuit 15C to circuit 15R with the driver door closed
- A change is made from circuit 15R to circuit 15 On with the driver door closed

The status of circuit 15 is placed on the interior CAN by the electronic ignition lock control unit.

The status of the driver door is placed on the interior CAN by the left front door control unit.

The driver seat control unit reads in all relevant information and actuates the steering column up/down adjustment motor accordingly.

Repeat limiter function sequence
The repeated insertion and removal of the transmitter key in and out of the electronic ignition lock control unit causes a switchover between the "move to entry/exit position" function and the "move to drive position" function. To prevent overloading of the steering column up/down adjustment motor, the number of requests is limited to five adjustment cycles.

The number of adjustment cycles is reset as soon as the electronic ignition lock control unit makes the status of circuit 15R available or when the left front door control unit (with left-hand drive vehicles) signals the "driver door open" or "driver door closed" status.

The functions approach entry/exit position or approach driving position are aborted under the following conditions:
- Undervoltage or overvoltage
- Manual adjustment request via the steering column adjustment switch (S59)
- Memory adjustment request
- Reversal of circuit 15 or status change of the driver door
- Defect at a Hall sensor integrated in the steering column up/down adjustment motor

Function sequence for crash-active easy entry/exit function (as of 1.6.09)
Following the occurrence of a crash event the steering column is automatically moved upwards to a defined position.

The crash signal is sent by the supplemental restraint system control unit (N2/10) over the chassis CAN to the front SAM control unit with fuse and relay module (N10/1) and forwarded by it over the interior CAN to the driver seat control unit.

The driver seat control unit then actuates the steering column up/ down adjustment motor.