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Air Suspension Description and Operation
Air Suspension
The primary mission of the Air Suspension System is the following for the rear suspension under loaded and unloaded conditions:
• Keep the vehicle visually level
• Provide optimal headlight aiming
• Maintain optimal ride height
The Air Suspension System consists of the following items:
• Air suspension compressor assembly
• Air suspension sensors
• Rear air springs
Important: The Air Suspension System must have a voltage supply of at least 12.6V to operate properly.
The Air Suspension System will maintain the rear D height within 4 mm (0.15 in) in all loading conditions and the leveling function will deactivate if the vehicle is overloaded. The side to side D height variation is maintained within 8 mm (0.31 in). After ignition is turned off, the air suspension control module (ASCM) will remain active for between 30 minutes and 2 1/2 hours. The system will exhaust pressure within 30 minutes after the ignition is turned off to lower the vehicle after unloading. In a temperature-controlled environment, the leakage of the complete load leveling system will not result in more than 1.4 mm (0.05 in) drop of rear suspension height at GVWR during a 24 hour period. If the outdoor temperature drops from +20°C (+68°F) to -5°C (+23°F), the rear D height may drop as much as 25 mm (1 in). However, the Air Suspension System should return to the specified D height when the ignition is again cycled to ON.
What is the problem ?
Diagnostic Trouble Code (DTC) Displaying
The Air Suspension system has an internal clock to prevent overheating if the compressor assembly is running for a prolonged period of time. If the system overheats, all leveling function stops until the system cools down. During this time, the indicator LED on the air inflator switch will be quickly flashing at a constant rate.
The other three diagnostic trouble codes are displayed with a blink code on the inflator switch LED. The Air Suspension Compressor Assembly shall begin to indicate the code when the condition to cause the code becomes current.
The number of the fault code shall be represented by the number of flashing pulses on the inflator switch LED. The flashing pulses shall have a repetition rate of 0.5 seconds and each code shall be separated by a 3.0 second delay. All codes shall be flashed in the order of occurrence of the fault. The blink code shall take priority over other processes that have access to the inflator switch LED. Refer to the following:
• DTC 001
• DTC 002
• DTC 003
A restriction of freon is usually caused by a plugged orifice tube. Your A/C system is a sealed system, so if there are contaminates in the system that have plugged up the orifice tube there is only one source...the compressor. If you have to change the orifice tube, you have to plan on changing the compressor as well. It can't be long for this world.
Check to see that air conditioning compressor is actually cycling while a/c is "turned on". If it is not then most likely the system is low on refrigerant and there is a low pressure sensor that keeps the system from running while low on refrigerant.
It's possible you have a leak in the air suspension and the air compressor is trying to keep it aired up which is draining our battery. Disconnect the power from the air compressor for a couple of days. If your battery still goe down, then the problem is somewhere else. If you do have aleak, then the air suspension will probably be bottomed out by that time, but your battery should still be good.
Check the refrigerant charge of your system. If there's no pressure in the lines, the whole A/C system will shut-off. Check for leaks in the tubes, hoses, filter dryer, pressure switches, and compressor fittings. If the system has no charge and there's no visible leak from the items mentioned, the leak could be in the evaporator coil or condensing coil.
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