2021 RAM 2500 Owners Manual - AIR SUSPENSION SYSTEM — IF EQUIPPED



AIR SUSPENSION SYSTEM — IF EQUIPPED

DESCRIPTION

This air suspension system is a rear leveling ride height system. The main purpose of this system is to maintain the truck’s rear ride height level. There are two selectable heights that can be chosen based on your operating conditions.

The system requires that the ignition be in the ON/RUN position or the engine running with zero vehicle speed for all user requested changes and load leveling.

 

Normal Ride Height (NRH) – This is the standard position of the suspension and is meant for normal driving. It will automatically adjust to maintain the rear ride height as conditions change.

Alternate Trailer Height (ATH) – Lowers the vehicle approximately 1 inch (25 mm) for a level truck, to be used as required while trailer towing. It will automatically adjust to maintain the rear ride height as conditions change.

Trailer Decoupling/Unloading - The air suspension system will continue to load level after the vehicle has been turned off for

10 minutes without compressor activation. This allows for easy removal of a trailer and/or load from the back of the truck by maintaining the

ride height. After 10 minutes you will need to turn the ignition to the run position for the air suspension to re-level due to addition/removal of load in the vehicle. If the air suspension system is disabled using the settings menu (Tire Jack Mode, Transport Mode, Alignment Mode, or Bed Lowering Mode) the system will remain disabled when the vehicle is turned off.

Reactivating the air suspension can be accomplished via the settings menu or driving the vehicle above 5 mph (8 km/h) for Tire Jack Mode, Alignment Mode, Transport Mode and Bed Lowering Mode.

Most 3500 models will not lower to Alternate Trailer Height (ATH) when unloaded.
For further information page 236.

 

AIR SUSPENSION MODES

The air suspension system has multiple modes to protect the system in unique situations:

To assist with changing a tire, the air suspension system has a feature which allows the automatic leveling to be disabled

page 111 or page 258.

This mode is intended to be enabled with the engine running.

For towing your vehicle with four wheels off the road, the air suspension system has a feature which will put the vehicle into Entry/Exit height and disable the automatic load leveling system page 111 or page 258.

This mode is intended to be enabled with the engine running.

Before performing a wheel alignment, this mode must be enabled page 111 or

page 258.

 

This mode is intended to be enabled with the engine running.

This setting is used to lower the rear suspension to the lowest possible height and disable the air suspension system. It enables easier loading/ unloading of the truck and makes it easier to hook up trailers page 111 or page 258.

In order to “protect” the air suspension system, the vehicle will disable load leveling as required (suspension overloaded, battery charge low, etc.). Load leveling will automatically resume as soon as system operation requirements are met. See an authorized dealer if system does not resume.

INSTRUMENT CLUSTER DISPLAY MESSAGES

When the appropriate conditions exist, a message will appear in the instrument cluster display page 111.

An audible chime will be heard whenever a system error has been detected.

See an authorized dealer for system service if normal operation does not resume.

OPERATION

Pushing the Alternate Trailer Height (ATH) button once while at Normal Ride Height (NRH), will lower the vehicle to Alternate Trailer Height (ATH) and will illuminate the LED.

The LED will continuously blink until vehicle Alternate Trailer Height (ATH) has been achieved and the LED will turn on.

Pushing the Alternate Trailer Height (ATH) again will raise the vehicle to Normal Ride Height (NRH).

The LED will continuously blink until Normal Ride Height (NRH) has been achieved and the LED will turn off.

Transport Mode – No indicator lamps will be illuminated. Transport Mode is disabled by driving the vehicle, or deselecting the mode via the interface.
Tire/Jack Mode – No indicator lamps will be illuminated. Tire/Jack Mode is disabled by

 

driving the vehicle, or by deselecting the mode via the interface.

Wheel Alignment Mode – No indicator lamps will be illuminated. Wheel Alignment Mode is disabled by driving the vehicle, or by dese- lecting the mode via the interface.
Bed Lowering Mode – Telltale on the cluster will be illuminated. Bed Lowering Mode is disabled by driving the vehicle, or deselecting the mode via the interface.

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