Let me ask some stupid stuff..
I've a USB (to Belkin micro car charger)/ 3,5 mm Stereo (Input to head unit/ auxgate connect) to dock cable which i bought in the shop. I'm using an iPhone 3g with FW 3.1.3.
I only get a line out signal and the volume slider in the iphone disappears as connecting the cable. If the iPhone is connected to the original Apple Dock i've the volume slider which i like to have also in car.
I bypass my head unit and connect to an i-sotec auxgate connect. So volume is only controlled by the input device - so i need the volume slider of the iphone in the car.
I opened the dock connect cable and found a resistor and measured 67.8 k OHM. Regarding this site
Apple iPod - iPhone dock Connector Pinout - AllPinouts i need a 1k OHM resistor to get the volume slider?
My requirements:
I need the volume slider.
I don't want to see the "not copmpatible" message.
So what is the right resistor in my case?