Speed control systems (Tempostat / Speedtronic) (Mercedes-Benz G-Class W463)

General information

The Tempostat/Speedtronic speed control system is standard on the models in question. The system allows the vehicle to automatically maintain a selected cruising speed without using the gas pedal. The cruising speed must be at least 32 (petrol models)/40 (diesel models) km/h. The use of cruise control becomes especially convenient during long-distance driving on lightly loaded straight country highways. For safety reasons, it is not recommended to turn on cruise control when driving in the city, on winding roads with many turns, on slippery road surfaces, in heavy rain and in other adverse weather conditions. In the above cases, the driver must be able to fully control the vehicle's driving mode.

Warning! Inappropriate use of cruise control may cause a traffic accident! Activate the cruise control system only when driving on free highways and in favorable weather conditions.

Attention! During the operation of the system, the gas pedal may move automatically, but do not hold it with your foot to avoid damage to the support and axle mechanisms!

The speed control system on the models in question can operate in one of two modes: as a standard design cruise control, and as a variable speed limiting system (Speedtronic), - switching between modes is performed using the steering column lever switch located on the left side of the steering column, above the combined steering column switch assembly (see illustration Layout of control components on the instrument panel and steering column). The same switch provides the ability to control the operation of the system within the selected mode.

Tempostat Operation Management

Switching between the operating modes of the speed control system is done by pressing the end part, which activates the variable speed limit mode (Speedtronic) accompanied by the activation of the LIM indicator light lever built into the assembly.

The activation/mode switching/tempo control switch is located on the right side of the steering column (in standard mode the LIM indicator does not light)

Standard mode

In the standard operating mode of the cruise control, the LIM indicator built into the control lever handle should not light up; if necessary, press the end button of the handle (5).



The design of the cruise control switch allows any current vehicle speed to be entered into the system memory as cruising speed if it exceeds a value of 32 (petrol models)/40 (diesel models) km/h, - it is enough to briefly press the control lever up or down. After entering the cruising speed, release the gas pedal.

The cruising speed value is increased and decreased by pressing the lever up/down respectively and holding it in this position.

Note: By briefly pressing the lever up and down with the cruise control activated, the cruising speed value can be adjusted in 1 km/h increments. When the lever is released after the adjustment has been made, the newly selected value is automatically stored in the system memory.

Brief acceleration of the vehicle, for example when overtaking, can be achieved by pressing the gas pedal - after releasing the pedal, the speed will automatically decrease to the cruising value stored in the cruise speed setting.

After accelerating the car to a speed above 32 (petrol models)/40 (diesel models) km/h, the cruising speed stored in the memory of the speed controller can be recalled by briefly pulling the lever towards you.

Caution! Activate the recall of the cruising speed from the system memory only if you remember its value and are ready to drive in the corresponding speed mode.

Note: When driving with cruise control on, deviations from the set cruising speed may occur downhill or uphill.

To turn off the cruise control, simply push the switch lever away from you or press its end handle - the selected cruising speed value will remain in the system's memory.



When turning the key in the ignition switch to the position 1 or 0 the cruising value entered into the temperature controller memory is reset.

The cruise control is also switched off by pressing the foot brake pedal or pressing the clutch pedal for more than 4 seconds (models with manual transmission), as well as moving the AT selector lever to the "N" position (models with AT).

Speedtronic mode

The Speedtronic system provides variable limitation of the vehicle speed according to the selected parameters.

A variable speed limiter allows you to limit engine speed without exceeding a certain set speed threshold, for example, when it is necessary to strictly comply with traffic rules.

Attention! Do not forget that the driver is always responsible for exceeding the speed limit!

The activation/mode switching/tempo control switch is located on the right side of the steering column (control principle in Speedtronic mode, - the LIM indicator is on).





The variable speed limit mode is activated by pressing the end of the cruise control switch lever handle and is accompanied by the activation of the yellow LIM indicator built into the switch handle - a similar indicator is also built into the speedometer assembly on the vehicle's instrument panel (see Section Instrument cluster, gauges, control lamps and indicator lights).

Note: The limiter is activated only if the current vehicle speed differs from the limit value stored in the system memory by no more than 30 km/h.

Changing the speed limit value (in 10 km/h increments) is performed by pressing the switch lever up or down, - the selected speed limit value will be displayed on the multifunctional display screen. With the engine running, it is possible to enter any speed limit, starting from 30 km/h.

The set speed limit can be exceeded by pressing the accelerator pedal all the way to the stop and passing the resistance point (enable kickdown mode).

Unlike cruise control mode, pressing the foot brake pedal does not disable the speed limiter.

The limitation mode can be exited by briefly pushing the lever away from you, or by pressing the end of its handle - the LIM indicator should go out. The limiter is automatically disabled when the car accelerates in kickdown mode to a speed exceeding the set limit by more than 20 km/h.

If the limiter fails to cope with the task, for example when driving downhill, a warning buzzer is activated and a message is displayed on the instrument cluster display screen "LIMIT EXCEEDED".

Due to design features, the speedometer readings may differ slightly from the speed limiter settings.