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Sprinter 906
ZH4
Downhill Speed Regulation for 4x4 (requires ZG3 & MS1)
Details & Technology
The code ZH4, Off-road operation, includes a Downhill Speed Regulation (DSR). DSR supports
the driver with the Low Range transmission ratio when the vehicle is driving downhill off-road
and on construction sites.
DSR maintains a preset speed on downhill gradients by applying the brakes as required. The
speed can be set between about 2.5 mph (4 km/h) and 11 mph (18 km/h) using the brake
and accelerator pedals or the cruise control lever.
When the vehicle is faster than 11 mph (18 km/h) off-road, DSR switches to standby mode.
DSR remains activated but does not brake automatically. If the vehicle is slower than 11 mph
(18 km/h) DSR sets the speed to the previously set speed. DSR switches off automatically
when the speed is exceeding 28 mph (45 km/h).
The Low Range transmission ratio is engaged, the indicator lamp in the instrument cluster
lights up and the vehicle is stationary or not faster than 18 km/h.
1. Activates DSR and stores the current higher speed
2. Activates DSR and stores the current speed
3. Activates DSR and stores the current lower speed
4. Deactivates DSR
Benefits & Arguments
With Downhill Speed Regulation DSR and the "low range" reduction gear, a constant speed of
between 2.5 mph and 11 mph can be set on steep downhill gradients which are then
maintained within the limits of what is physically possible with the aid of brake intervention.
Remarks
Requires ZG3 & MS1
©2015 Mercedes-Benz USA, LLC / Daimler Vans USA, LLC
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