Radio Test Functions

RADIO TEST FUNCTION: To activate the test, switch the radio on and within 8 seconds press and hold the "m" button for more than 8 seconds.

The displayed tests include:
- Radio Serial Number
- Radio Production date
- DSP Recognition (1/0)
- Station signal Strength
- Road speed dependent volume control (GAL 1-4)

Adjusting the GAL makes the volume increase more noticeable (4) or less noticeable (1).