Volvo xc40 amplifier

[Lukas]

If you have enabled the 210 SUBWOOFER, disable it. Because according to the picture, you do not have SUB output on PIN7. 
You did not mention if you tested all the outputs but start from the PIN2 which is the center output.  Put the Fader and Balancer in the center, and test. You should hear something.  I know it's dumb question but according to the picture, I do not see "play" symbol at the top in the pictures. Are you sure you are playing something? 

If you still do not hear a sound on PIN 2. 
Put the setting 028 RADIO, AMP AND SPEAKER SYSTEM  to 01 and retest. If still nothing then put the setting 028 RADIO, AMP AND SPEAKER SYSTEM to 04. 
Once you can hear from PIN2 (center) test the other outputs (1, 3, 4, and 5) while playing with the balance. 

I have the xc40 CMA wiring but yours is SPA and wiring is different.  (according to the pictures).

the FM radio is played.  I had the balancer and fader in several positions.  I don't want to fill the forum with a lot of photos.  I also tried other channels.  sound was only 1st and 3rd channel.  today I also tried 028=01.  also no change.  I will try 028=04 tomorrow.  I will write the result.  I turn off the sub.