expert setting on radio

[2863]

the rear speakers arnt working on me 172
ive herd theres an expert (or something)setting on the radio
question:-wot button do i press to get them to work?
p.s its nowt to do with the fader control,i know how to get that up

any help would be gratly appriciated
p.p.s.,my manual is in duch!

 

[Tom]

hold down src

 

[2863]

ill try that tom

 

[2863]

still no joy
gunna see if they are connected

 

[blink172]

Which rears? You do know there arent any next to the parcel shelf

 

[2863]

problem sorted .
they wernt even connected!
whoever had the car first had an install
anyway sorted now,
thanks for help
WR