Symptom Related Diagnostic Procedures

Information and verification, front/rear parking assistance

Symptom and function description
The parking assistance system is activated automatically when the vehicle starts. An LED illuminates in the button for park assist when the system is active.
- Parking assistance is active at speeds below 15 km/h. At higher speeds, the system deactivates. When the speed drops below 10 km/h, the system is activated again.
- The closer the vehicle gets to the object in front or behind, the more frequent the signals become. At a distance of approx. 30 cm, the tone should be constant.

Rear parking assistance
- Parking assistance in reverse activates when reverse is engaged. "PARK ASSIST ACTIVE" appears in the audio display when reverse gear is engaged.
- The measurement range behind the vehicle is approximately 1.5 m. The minimum size of the object that can be detected is a pipe shaped object with a minimum length of 850 mm and a minimum diameter of 85 mm.

Front parking assistance
- Parking assistance forwards is active at speeds below 15 km/h.
- "PARK ASSIST ACTIVE" appears in the audio display when the sensors react to an obstacle ahead.
- The measurement range in front of the vehicle is approximately 0.8 m. The minimum size of the object that can be detected is a pipe shaped object with a minimum length of 850 mm and a minimum diameter of 85 mm.

Hint:
- A message is shown in the text display, in the driver information module, in case of many malfunctions in the parking assistance system.
- Snow and ice on the sensors can impair the function.
- If a trailer is connected or a bicycle holder is on the tow hitch, the system must be switched off.
- The front parking assistance cannot be combined with auxiliary lamps as the sensors react to them.
- Under certain circumstances the park assist system may give false warning signals, which are caused by external sound sources, which produce the same ultrasound frequencies that the system works with. This does not indicate a fault in the system. Examples of such sources are:
- Horn.
- Wet tires on asphalt.
- Pneumatic brakes.
- Exhaust pipe on motor bike.

Verification
Access to the vehicle is necessary for the following checks.
- Ignition on or start the engine.
- Engage reverse gear.

Does the text "PARK ASSIST ACTIVE" appear in the audio display when reverse gear is selected?

Is sound emitted from the loudspeakers, if there is an object behind the vehicle?
Test by placing an object or having a person stand behind the vehicle. Move the object/person both closer to and further away from the vehicle and check that the sound frequency increases the closer one gets. At a distance of approx. 30 cm, the tone should be constant.
On left-hand drive vehicles, the sound is emitted from the right-hand rear loudspeakers. On right-hand drive vehicles, the sound is emitted from the left-hand rear loudspeakers.

If the vehicle is equipped with a front park assist system:

Does the text "PARK ASSIST ACTIVE" appear in the audio display when the front sensors should detect an object in front of the vehicle?

Is sound emitted from the loudspeakers if there is an object in front of the vehicle?

Test this in the same way, by positioning a person or object in front of the vehicle. Sound should be heard from the loudspeaker.

Is the function OK?

Yes - No Fault Found

No - FAULT FOUND

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