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Air Suspension Malfunction - GL 450 Mercedes-Benz Cars & Trucks

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Audi A8 sits low in front both light are blinking


Your air suspension system is bad. Likely one of air springs/bags has a leak. The compressor overheated and tripped out. The system needs to be reset.

I also had the system malfunction (compressor not running anymore to inflate the air bags to proper level) and found that water had entered the fuse/relay chamber under the hood; relays contact corroded and did not work anymore.

Feb 16, 2017 | Audi A8 Cars & Trucks

2 Answers

Lower rear end of 2002 Park Avenue


Does your Buick have electronic level control (ELC), which utilizes air adjustable shocks. ELC maintains the rear trim height under a wide range of loads. Refer to ELC, as applicable ? Have you changed shocks on the back ?

Jan 18, 2017 | Cars & Trucks

1 Answer

I have a 2006 lincoln navgator why in the front does it keep going down


The Navigator has an air ride (air bag) suspension system. It uses a compressor and air bags in the suspension to provide a smooth and level ride. These systems are fairly reliable, but can malfunction due to misuse or parts failure. A common problem with these is that you must turn off the air ride system before raising the vehicle on jacks or a lift. This is because the weight of the vehicle provides a feedback pressure to the compressor to allow it to determine proper level and shutoff point. If the vehicle's weight is removed from the suspension with the air ride on, the compressor can over-inflate the air bags and cause them to blow out and fail. Other things that can happen are leaking air hoses, o-rings, seals and such.

Nov 26, 2016 | Lincoln Cars & Trucks

1 Answer

Rear suspension will deflate but why won't it inflate?


That could work , You mite be able to test the sensor in question with ohm meter . Test the front one an see what the resistance is ,then check the back one. I don't know what it should be with out looking it up in the service info . You could also check to see if the sensor is getting power from the control module , an see if there is a return input to the module .
There are a few DTC'S this able to set !
Air Suspension Control Module Diagnostic Trouble Code (DTC) Index
Air Suspension Control Module Diagnostic Trouble Code (DTC) Index DTCs Description Source Action B1318 Battery Voltage Low Air Suspension Control Module Go To Pinpoint Test C . B1342 Air Suspension Control Module Air Suspension Control Module INSTALL a new air suspension control module. REFER to Module-Air Suspension Control . SET the front ride height. REFER to Air Suspension Initialization (Clear DTC B2140). CLEAR the DTCs. REPEAT the self-test. B1485 Brake Pedal Input Circuit Battery Short Air Suspension Control Module RERUN On-Demand Self-Test. MAKE SURE that the brake pedal is not pressed. If DTC is returned again, REPAIR brake pedal position (BPP) circuitry. B1566 Door Ajar Circuit Short to Ground Air Suspension Control Module Go To Pinpoint Test D . B2140 Initialization Failure (Vehicle Ride Height Not Programmed) Air Suspension Control Module REFER to Air Suspension Initialization (Clear DTC B2140). C1439 Vehicle Acceleration EEC-V Circuit Failure Air Suspension Control Module Go To Pinpoint Test E . C1724 Air Suspension Height Sensor Power Circuit Failure Air Suspension Control Module Go To Pinpoint Test F . C1726 Air Suspension Pneumatic Failure Air Suspension Control Module Go To Pinpoint Test G . C1760 Air Suspension Height Sensor High Signal Circuit Failure Air Suspension Control Module Go To Pinpoint Test H . C1770 Air Suspension Vent Solenoid Output Circuit Failure Air Suspension Control Module Go To Pinpoint Test I . C1790 Air Suspension LR Air Spring Solenoid Output Circuit Failure Air Suspension Control Module Go To Pinpoint Test J . C1795 Air Suspension RR Air Spring Solenoid Output Circuit Failure Air Suspension Control Module Go To Pinpoint Test K . C1830 Air Suspension Compressor Relay Circuit Failure Air Suspension Control Module Go To Pinpoint Test L . C1917 Steering Electronic Variable Orifice (EEVO) Out-of-Range Fault Air Suspension Control Module Go To Pinpoint Test Q .
  • Uneven vehicle height
  • Circuitry.
  • Rear pneumatic fault.
  • Air compressor assembly.
  • Air suspension control module.
  • Go To Pinpoint Test I .

Nov 06, 2015 | 2002 Lincoln Navigator

1 Answer

2007 s550 says malfunction


This is the air ride level. Could be a fuse could front air suspension could be rear air struts. Don't try any of those other answers MY GOD!!!!

May 25, 2012 | Mercedes-Benz Cars & Trucks

1 Answer

Ok susp light came on


A malfunction with the air suspension system has been detected
Start with the basics and check the switch in the right front passenger footwell , by the kick panel and see if the air suspension service switch has been turned off , or perhaps its fuse # 12 ( 15 amp ) for the air suspension switch , or fuse # 15 - 5 amp for the air suspension module ( but unless you have noticed other things not working it's probably not that fuse ) In the power distribution box in the engine compartment
( Ford states to disconnect your battery before servicing anything in the PD BOX ) fuse # 109 is a 50 amp maxi-fuse for the air suspension compressor , or it could be a sensor or the compressor itself etc.

Nov 14, 2011 | 1999 Ford Expedition

1 Answer

Can I replace my F55 struts with Monroe Sensa trac


the system is integrated design and not a good idea to do this it may be possible but air system is designed to us magniride and will malfunction if changed

Oct 30, 2009 | 2003 Cadillac Seville

1 Answer

Ford Expedition rear bumper is lower


Either someone backed into it or you have a suspension issue. If you have air suspension the light should be on indicating a malfunction. If you do not have air suspension you may have collapsed spring if nothing else is broken

Sep 19, 2009 | 2000 Ford Expedition

1 Answer

99 expedition air suspension compressor runs every couple minutes


It is normal for some cycling of the compressor as the ride heights change and the compressor vents and fills air springs. Info:

Air Compressor
The air compressor:
  • Is not interchangeable with the rear air suspension (RAS) air compressor.
  • Consists of the compressor and vent solenoid; neither are replaceable as individual items.
  • Is a single cylinder electric motor driven unit that provides pressurized air as required.
  • Is powered by a solid state relay, which is controlled by the air suspension control module.
  • Passes pressurized air through the compressor air drier that contains silica gel (a drying agent). Moisture is then removed from the compressor air drier when vented air passes out of the system during vent operation.
  • The drier may be replaced separately.
  • The drier has dual ports and is not interchangeable with the RAS drier.
The vent solenoid:
  • Allows air to escape from the system during venting actions.
  • Is part of the air compressor cylinder head.
  • Shares a common electrical connector with the air compressor motor.
  • Is enclosed in the cylinder head casting, which forms an integral valve housing that allows the valve tip to enter the pressurized side of the system.
  • Has an O-ring seal that prevents air leakage past the valve tip.
  • Opens when the air suspension control module determines lowering is required.
  • Provides an escape route for pressurized air when system pressures exceed safe operating levels.
  • Has a 1792 kPa (260 psi) internal relief valve.
  • Is installed with the air compressor as a unit.
Compressor Relay
A solid state relay is used in the air suspension system for compressor control. The relay incorporates a custom power metal oxide semi-conductor field effect transistor (MOSFET) and ceramic hybrid circuitry. The relay switches high current loads in response to low power signals and is controlled by the logic of the air suspension control module.
The compressor solid state relay is energized by the air suspension control module to have high current flow from the battery to the compressor motor.
Control Module
NOTE: The 4WAS control module is also used for the RAS system. The internal processor recognizes external circuitry to determine if it is installed in a 4WAS or a RAS system.
NOTE: The air suspension control module is calibrated with information from the air suspension height sensors. A new or swapped air suspension control module requires the ride height adjustment calibration process to be performed.
A microcontroller-based electronic air suspension control module controls the air compressor motor (through a solid state relay) and all system solenoids. The air suspension control module also provides power to front and rear height sensors. The air suspension control module controls vehicle height adjustments by monitoring the two height sensors, vehicle speed, a steering sensor, acceleration input, the door ajar signal, transfer case signals and the brake pedal position (BPP) switch. The air suspension control module also conducts all fail-safe and diagnostic strategies and contains self-test and communication software for testing the vehicle and related components.
The air suspension control module is interchangeable between the RAS and 4WAS system.
The air suspension control module monitors and controls the system through a 32-pin two-way connector. The air suspension control module is keyed so that it cannot be plugged into an incorrect harness. There are two sides of the harness connection to the air suspension control module. Each is uniquely colored and keyed to prevent reversing the connections.

Pressure Relief Valve
The pressure relief valve (PRV) protects the rear air suspension components by venting the system to a specific pressure in the case of a system malfunction. The system will decrease the pressure to an acceptable level to maintain vehicle height. In the normal operation mode with normal system pressure, the PRV is constantly closed and does not have any effect on the system performance or function. The PRV is replaceable without any air lines.
  1. If the concern remains after the inspection, use New Generation STAR (NGS) Tester connected to the data link connector (DLC) to retrieve continuous diagnostic trouble codes (DTCs) and to execute On-Demand Self-Test diagnostics for the air suspension control module.
    • If the On-Demand Self-Test is passed and no DTCs are retrieved, go to the Symptom Chart to continue diagnostics.
    • If DTCs are retrieved, go to Air Suspension Control Module Diagnostic Trouble Code (DTC) Index in this section.
    • If the air suspension control module cannot be accessed by NGS Tester, go to Pinpoint Test A.
Self-Test
Verify that the following conditions are met before running the On-Demand Self-Test.
  • All doors, liftgate, and liftgate glass must be closed.
  • The transmission is in PARK.
  • The BPP switch is not pressed during the test and the parking brake is not set.
  • The accelerator pedal is not pressed during the test.
  • The vehicle is not in 4L mode.
  1. Fulfill the pre-conditions.
  1. Install a battery charger for the On-Demand Self-Test to prevent battery drain.
  1. Run the air suspension On-Demand Self-Test.
  1. Record all listed DTCs.
  1. Retrieve stored DTCs.
  1. Troubleshoot any On-Demand Self-Test DTCs first.
  1. Retest and clear DTCs after repairs.

Apr 13, 2009 | 2000 Ford Expedition

1 Answer

I have a 1998 ford expedition eddie bauer with front air bag suspension and after driving for about 45 minutes the air suspension light comes on. what's the problem and how do I fix it


here's some info. Do you have a warning light on or does it say "Check Susp"?

Control Module
NOTE: The 4-wheel air suspension (4WAS) control module is also used for the rear air suspension (RAS) system. The internal processor recognizes external circuitry to determine if it is installed in a 4WAS or a RAS system.
NOTE: The air suspension control module is calibrated with information from the air suspension height sensors. A new or swapped air suspension control module requires the ride height adjustment calibration process to be performed.
A microcontroller-based electronic air suspension control module controls the air compressor motor (through a solid state relay), and all system solenoids. The air suspension control module also provides power to front and rear height sensors. The air suspension control module controls vehicle height adjustments by monitoring the two height sensors, vehicle speed, a steering sensor, acceleration input, the door ajar signal, transfer case signals, and the brake pedal position (BPP) switch. The air suspension control module also conducts all fail-safe and diagnostic strategies and contains self-test and communication software for testing of the vehicle and related components.
The air suspension control module is mounted in the passenger compartment inside the instrument panel, above the radio and temperature controls. The air suspension control module is interchangeable between the RAS and 4WAS system.
The air suspension control module monitors and controls the system through a 32-pin two-way connector. The air suspension control module is keyed so that it cannot be plugged into an incorrect harness. There are two sides of the harness connection to the air suspension control module. Each is uniquely colored and keyed to prevent reversing the connections.
Solenoid, Air Spring
swj~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Never rotate an air spring solenoid valve to the release slot in the end cap fitting until all pressurized air has escaped from the spring to prevent damage or injury.
The air spring solenoid:
  • Allows air to enter and exit the air spring during leveling operations.
  • Is electrically operated and controlled by the air suspension control module.
  • Is only replaced as a unit.
Air Suspension Diagnostic Connector
The air suspension diagnostic connector is used to aid the technician in diagnosing the air suspension system. It is also used to vent the system of compressed air when air suspension system components need to be repaired or replaced. The air suspension diagnostic connector is located under the steering column.
Steering Sensor
The steering sensor is mounted inside the passenger compartment on the steering column. It provides steering rate and position to the air suspension control module through two signals.
Pressure Relief Valve
The pressure relief valve (PRV) protects the rear air suspension components by venting the system to a specific pressure in the case of a system malfunction. The system will decrease the pressure to an acceptable level to maintain vehicle height. In the normal operation mode with normal system pressure the PRV is constantly closed and does not have any effect on the system performance or function. The PRV is replaceable without any air lines.
The PRV is located in the rear of the vehicle on the middle of crossmember #5 as a part of the rear air line assembly.

Mar 09, 2009 | 1998 Ford Expedition

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