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.
Rear Leveling Ride Height Switch
Standard Ride Height (SRH) – 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.
If lightly loaded, 3500 models will lower as close to 1 inch (25 mm) as possible.
Trailer Decoupling/Unloading – The air suspension system will continue to load level after the vehicle has been turned off for 5 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 5 minutes you will need to turn the ignition to the ON/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.
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Most 3500 models will not lower to Alternate Trailer Height (ATH) when unloaded.
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For further information TRAILER TOWING.
The air suspension system uses a high pressure volume of air to operate the system. To avoid personal injury or damage to the system, see an authorized dealer for service.