I have a similar radio installation question. I bought a new no-name Android-based stereo for my W210 where the radio comes with a wiring harness. The end of the wiring harness that is not connected to the radio is a standard female ISO connector (in other words, the radio came with a wiring harness, one end of which connects to the radio, the other end of which has a female ISO connector). Our W210's radio wiring harness is a standard male ISO connector. In a perfect world, I'd just plug these two ISO connectors together and the radio would work. That appears to not be the case as the radio appears to be receiving no power (neither when the car engine is turned on, nor when the key is just in the ACC position).
I've confirmed, by re-attaching the old becker radio, that the W210's wiring harness is still carrying power and therefore, I haven't blown the car's fuse for the radio circuit, I think.
So, please give me some advice. Am I supposed to buy a female ISO connector to attach to the stock W210 wiring harness and then buy one of the Metra harnesses that contains a male ISO end to hook to the female ISO connector provided with the radio AND swap some of the wires in my "wiring bridge" between the W210's harness and the harness provided with the radio?
If you can't tell...I'm new to aftermarket radio installations.
The W210's male ISO connector consists of two sections: the "A" section and the "B" section. The "A" section consists of all of the speaker wires and those wires seem to line up correctly with the speaker wires on the female ISO connector attached to the new radio.
http://www.benzworld.org/forums/att...tereo-wire-diagram-2000-e320-wire-diagram.jpg
I have questions about the "B" section - the W210's B wiring, has two rows of pins. According to a wiring diagram found on this forum there are eight pins laid out like below:
"1 3 5 7"
"2 4 6 8"
pin 1 has no wire connected, but the wiring diagram has it listed as "speed dependent volume control". Pin 2 has a grey wire, the wiring diagram lists it as "not used". Pin 3 has a yellow/Blue wire and is label on the diagram as "Phone Mute", Pin 4 is Red/White, labelled as "Constant 12V". Pin 5 is Blue and labelled as "Power Antenna". Pin 6 has no wire and is labelled as "N/A", Pin 7 is empty, and Pin 8 is Brown and is supposed to be the Ground.
Now, I am confused. How is it possible that the W210 wiring harness has nothing labelled as "12v when key is in ACC mode"? I don't expect the harness to just have a constant 12V and a ground.
On the female ISO wiring harness attached to the radio, the Pin 4 for constant 12V matches up with the W210 harness, the Pin 8 matches up for Ground. Pin 6 is labelled as "Illumination", which is unpopulated on the W210 harness. Pin 7 on the radio's harness is labelled as "ACC", which seems to be empty on the W210's harness. The radio's harness is empty on Pins 1, 2, 3, and 5. The new radio has a separate antenna connection to which I can attach the W210's separate antenna wire with an adapter, so I'm not worried about the radio having PIN 5 empty. I don't know what Pin 2 on the W210's harness is supposed to be for. That is the one with the thin grey wire attached. I'm also not concerned about PIN 3 being depopulated as I won't be using the W210's built in phone system.
So, please, help an audio newbie out. When I plug the W210's male plug into the new radio's female plug, I expected the radio to at least turn on when I turned on the car, given that the constant 12V and the ground wires lined up between the two harnesses. I need help convincing myself that the radio itself has no problem, then I need help convincing myself of the proper way to wire it. Any help is appreciated.
If anyone is interested, the new stereo is this Eonon double din unit -
Eonon G2110 | Car GPS | Car DVD GPS | 2 Din Car GPS DVD | Android Car GPS | Android Car DVD Player
