clkman said:Hi,
Have a look at this web site page. It's for a comand install but does show the pin outs for plug A ( C1 ) and also how to take out the dash on a W203 C class.
Plug A (C1) is the main power in to the unit and is the same for Audio10, 30 and comand.
You need to supply power to
pin 4 ( 12V+ perm )
pin 7 ( 12V+ ignition)
pin 8 ( 12V- ground)
Link 4 and 7 together is OK to test the Audio30 APS and it should now power up OK, this is how I tested my Audio 30 APS ( now changed to COMAND ) without any problems.
Hope this helps.
http://phdwebsite.powerpulse.cc/COMAND/COMAND install and removal WIS.pdf
Got this one already

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