In this article, you will learn how to troubleshoot Mercedes Parktronic (not to be confused with Active Parking Assist).
Common problems and faults Mercedes owners often experience with the parking system. How to replace Mercedes bumper parking sensors yourself. Which by the way is very easy and you can save hundreds of dollars by doing yourself.
The first generation of Mercedes Parktronic system uses sensors on the bumper to detect objects nearby. It provides a visual and audible warning as the distance between the object and the car decreases.
Parking assist only works if the vehicle is in drive or reverse and Emergency/Park brakes are released.
The Parktronic system starts to beep as you get close to objects. The frequency of the beeps and tone start to increase as you get closer to objects in front or back of the car.
Mercedes Parktronic system does not work at speeds over 15 mph. The system will automatically turns off and gets enabled again when you slow down. The system is deactivated if you set the shifter to Park.
If there is a fault in the system you will need a Professional Diagnostic Scanner that can diagnose Mercedes systems.
When you read the fault codes, you may get error codes such as:
It is simple to spot when only one of the parking sensors on a Mercedes-Benz is defective. You will see one of the warning bars always lit up.
In which case you need to check the sensor that corresponds to the bar that always stays lit up. The bigger challenge is what to do when the Parktronic system doesn't work at all. Below you will find a few items that you need to check when Mercedes Parktronic doesn't work at all.
Check the fuse for the Parktronic system. In most cases, the fuse for Parktronic will be in the fuse box found in the trunk. The fuse is labeled Parktronic and typically is a 10A fuse. If the Parktronic fuse is not in the rear fuse box, check fuses on the side of the dashboard, under the rear seat or in the engine bay.
Use a digital multimeter to check for power at the Parktronic fuse.
Remove the bumper and check the wiring on the back of the sensors. Make sure all the sensors are plugged in. None of the wires are damaged or cut due to an accident or previous repair work. Unplug the electrical connector and check the terminals/pins on the sensor for corrosion. If you are missing one of the sensors, replace it with a genuine Mercedes Parking Sensor .
If you are expecting problems only when it rains, it is because water is getting into one or more of the parking sensors and causing that certain sensor to stop working.
The parktronics switch can get sticky or stop operating. You may want to go further and remove the switch to check the operation with a multimeter.
If the range of your Mercedes-Benz parking system is poor, clean the sensor first.
If the sensor still doesn't pick up objects until you get very close, identify which sensor is not picking up the object. Front or rear? Left or right? You can't adjust the range of the parking sensor. If the sensor is faulty or not picking objects it will need to be replaced.
In the following video, you will learn how to use a Level 3 OBD2 Scanner to troubleshoot Mercedes-Benz Parktronic. Note that diagnostic can also be performed with Level 2 OBD2 Scanner that is designed for Mercedes-Benz cars such as iCarsoft MBII which is a cheaper alternative.