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Home >> BMW >> 2005 >> 745Li >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - Overview (GA6HP26Z) >> GA6HP26Z Automatic Transmission >> Electronic Transmission Control >> System Components

System Components

Selector Lever:  The selector lever is located on upper right of the steering column. Shift position N, D and R are possible. The parking lock P is operated with a push button on the end of the selector lever (2).

All gearshifts are electrically controlled - there is no mechanical connection to the gearbox from this lever  . The positions are indicated in the instrument cluster.

Fig 1: Identifying Selector Lever
G03390494Courtesy of BMW OF NORTH AMERICA, INC.

Selector Lever Positions in Automatic Mode 

The shift pattern consists of positions R, N, D and the corresponding arrows. The selector lever can be moved from its mid-position by pulling back towards the driver (1). The lever can then be moved in a clockwise or counterclockwise direction and returns from each position automatically to the mid-position. Position P is separated from the shift pattern and is activated by pressing the push button at the end of the selector lever (2).

Special Features 

Automated Functions 

L/D Push Button in MFL:  US vehicles are equipped with the L mode (limiting function) which allows the driver to suppress certain shifts (ascending or descending steep grades).

Starting from position D, the limitation mode is selected by pressing the L/D push button. Initially, the current gear is retained and the vehicle will not upshift to a higher gear.

The system returns to the automatic mode by pressing the L/D button again or pressing the selector lever to position D.

Example:  Position D is engaged and the gearbox is in 4th gear. After pressing the L/D push button in the MFL, 4th gear is retained and is the upper limit. Gears 1 through 4 will be shifted automatically when the vehicle is driven.

Fig 2: Identifying L/D Push Button In MFL
G03390495Courtesy of BMW OF NORTH AMERICA, INC.

There are two push buttons integrated in the steering wheel facing the driver (ten and two o'clock position as shown above). The limitation stages are manually downshifted by pressing either of these buttons when the L mode is selected. It is not possible to upshift the limitation stages. There is no forced upshift when reaching the maximum engine speed.

When the L mode is selected, the indicator in the instrument cluster will illuminate to indicate L1 through L6.

Impermissible shift requests, such as a down shift that will cause the engine to exceed the maximum speed are suppressed by the transmission control module and are indicated only temporarily in the instrument cluster.

Position Indication with Shift Pattern:  The engaged position is only indicated in the instrument cluster. Depending on what position is selected, the corresponding selection is illuminated in the shift pattern. The arrows indicating the possible movement directions of the selector lever are also illuminated. An additional indication is provided in the L mode.

Fig 3: Identifying Position Indication With Shift Pattern
G03390496Courtesy of BMW OF NORTH AMERICA, INC.

After switching on the ignition and starting the engine, the P or N positions and all of the arrows are indicated. In positions D or R, the single arrow for the shift direction to return to N is indicated (next to the N indicator).