Mode selector switch - RA27057229290X(27-9290)

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The mode selector switch is integrated in the shift gate. The letter which is visible indicates the selected shift mode:

Switch position:

S = Standard mode

E = Economy mode

Fig 1: Identifying Mode Selector Switch

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Selector Switch Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

S mode

When the "S" mode is selected, 2nd gear is engaged when moving off in the lower part load range with the selector lever in positions "D" and "3". When moving off in the top part load range up to full load, the transmission shifts down to 1st gear as with kickdown. This enables maximum driving performance to be achieved.

E mode

The "E" mode is selected for a cam driving style with the accent on comfort and a reduced number of shift operations.

When the switch is set to "E", the car starts off 2nd gear when the selector is in positions "D" and "3" (without kickdown). The transmission shifts up and down in the top part load and full load range at lower vehicle speeds and engine speeds.

The E mode is automatically interrupted if kickdown is activated. Consequently, even if the E mode is selected, the full power reserve of the engine and thus maximum driving performance is available on demand, as with the S mode. As soon as the accelerator pedal position is eased back below the "E" limit, the transmission then follows the "E" mode again.

Function

The E/S mode selector switchover valve (Y4) is activated by the mode selector switch (S16/5), and connects the vacuum element integrated in the control pressure cable (7) with the intake manifold (3) and the vacuum reservoir (9). The pin of the vacuum element is pushed by the vertical rod connected to the relay lever (78). This limits the travel of the control pressure valve (46) and, as the throttle is opened further, the spring at the relay lever (78) is extended. If kickdown is activated when the E mode is selected, the kickdown switch (S16/7) interrupts the current supply to the economy mode switchover valve (Y4). Air is thus admitted to the vacuum element (7), and the E mode is deactivated for as long as the kickdown switch remains operated.