11 Mini Cooper Setting Off Rear Pad Warning Again After 2000 Miles
This week we are troubleshooting a Mercedes-Benz S-Class that lowers itself when parked. Mercedes-Benz lowering is intermittent. In some cases, the motorcar will drop itself overnight but non always. If the vehicle is parked on an incline or downhill the raising or lowering when parked may stop. There are many possible causes for this malfunction. Mercedes-Benz with airmatic suspension tries to self-level when parked just they end up completely lowering to the footing. In our instance, the Southward-Class would enhance to normal height when the car started. The airmatic intermission would normally work for the rest of the trip.
Symptoms
Mercedes-Benz Eastward, C, CLK, GL, S-Form may develop any of the following problems.
- Hissss… air released by the air compressor release valve.
- You hear air compressor engaging when parked.
- Air compressor releases air when parked.
- Car lowers overnight, not ever.
- Mercedes lowers drops on rear or front.
- Or Mercedes raises itself when parked
Cause
When the auto is parked the airmatic will attempt to level the car. It does this by discharging air from the airmatic interruption strut that is too high. Typically the car is leveled by lowering the one or two corners of the automobile that are too high. Nosotros also accept seen cases when an wrong installation of the level sensor acquired the airmatic trying to level the car by increasing air pressure at certain strut, therefore, raising the car to the maximum setting.
The cause of this problem is unremarkably one of the level sensors. Each of these sensors has ii hall effect sensors inside.
- B22/8 Left Front Level Sensor
- B22/9 Right Forepart Level Sensor
- B22/3 Rear Axle Level Sensor
The two forepart level sensors are located at the air pause struts. In some models, you will only find one sensor at the rear axle. In this case, it measures the position of the torsion bar which provides an average vehicle height for both rear wheels.
The level sensors mensurate the current height of the vehicle, and those reading are stored on the airmatic command unit.
Yous Mercedes-Benz airmatic control unit volition calibrate vehicle height. It does this and then that the one corner of the automobile is not sitting too low or too high compared to the residuum of the car.
When the level sensors are damaged they tin throw off the calibration process. The vehicle tin't level itself, and it continues releasing air from via the pressure release valve. Somewhen, your Mercedes-Benz lowers to the ground or it can also raise to the maximum setting.
Possible Missdiagnosis
Information technology is possible for a mechanic to misdiagnose vehicle lowering as a leaking air suspension strut or leaking air hoses. This is not ever the case. When I air suspension (airbag) strut leaks your Mercedes-Benz will drop significantly on the corner with the leaking air suspension strut.
At the air strut, at that place are also accelerometers whose main purpose is to make up one's mind road weather. If the strut is moving up and down besides frequently during driving the airmatic may heighten the vehicle every bit it things that the road weather condition are rough. When the accelerometer fail they generate fault codes C1123 or C1121. They also tin crusade the vehicle to raise to the highest setting when they malfunction.
Solution
To gear up bug such as Mercedes-Benz raises or lowers when parked you need to start past inspecting the level sensors.
- Inspect the front level sensors to brand sure there is no bending of the arm. Make certain the wires are not damaged. If you performed any intermission repair ensure that the level sensor at the front airmatic strut is non installed backward.
- Inspect the level sensor at the rear torsion bar. Ensure the connecting rod is not bent.
If the sensors do non have any visible concrete damage, your next pace is to carry a vehicle level calibration. This can be performed by an motorcar repair shop, or yous tin can perform information technology yourself if yous accept a scanner capable of performing airmatic troubleshooting. You will need a scanner that provides similar capabilities to Mercedes Star Diagnostic and allows you to scan multiple command systems in your Mercedes-Benz including programming, actuating and calibrating sensors.
Scout the following video on how to access the airmatic control unit of measurement and perform calibration using the Autel DS708 diagnostic scanner.
Source: https://www.mercedesmedic.com/mercedes-lowers-drops-parked-air-suspension-self-leveling-problems/
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