For those of you that have the parking distance sensors in the rear, do you find the volume to be barely audible especially with the engine running? I can hear it just fine with the engine off. I'd like to know if there's a way to increase the volume somehow. My dealership doesn't know of such a way. Any suggestions?

 

Loren on Renntech finally posted a solution so for those of you that were curious:

1. Connect the PIWIS tester 9718 to the vehicle and start it. Switch on the ignition. >> Continue.
2. Select the vehicle type.
3. Switch to the Special functions menu and perform the vehicle handover using the F8 key.
4. In the Special functions menu, erase All fault memories by pressing >>.
5. Carry out automatic search of control units.
6. Using the >> key, move from the vehicle type to the list of control units.
7. Select ParkAssist with the cursor keys and press the >> key.
8. Select Coding and press the >> .
9. Select Vehicle type and code with F8 .
Vehicle type
997
987
10. Select Volume and code with F8 .
Volume
Loud
Quiet
11. Take a test drive, read out the fault memory and erase it if necessary.
12. ParkAssist has now been taught.