I a have a 300C touring from 2007 and a very old radio in it with the boston sounsystem.
So I thought, let's buy a new one wit all features you can imagine.
I installed the new system and it seems to function well exept there is no sound at all.
I think I did all the wiring well. I will post the diagrams of the old and new unit here. I think I have allready the canbus system because of the old diagram. Also I can't program my steering wheel.
I have put the speakerwires to the speakerwires from the old diagram. The bats goes to the batt, gnd to gnd, brake to gnd, acc to radio on, keypad studio to can+\-. The rest I don't use.
If I connect a external speaker all works well.
Can anyone tell me in simple language how to solve these 2 problems?
If the radio wasn't mean as an OEM replacement there would need to be an adapter.
I think part of the problem is the CAN-BUS interface related item. It would become
quite apparent that this is where you are having difficulty.
If your car has an amp, it is likely the new radio isn't able to signal for the amp to
be turned on, hence lack of sound. But it probably doesn't stop there. As you
indicate, you can't get steering wheel controls to work. I don't know of any
method to do this without an adapter, unless, as I said, the radio is configured
as an OEM replacement.
Then finally there will be volume, fader, and tone control issues. Without CAN-BUS,
these likely will not work as well.
First step: Find out if you have an amp in the car. This would be based on the options group the car came with.
I don't have a amp (it should be placed then in the trunk of my car and there isn't one) and I think, that I have a can bus, because of the 2 wires in the old diagram (can+/-). My old factory radio could be managed by the sw, I suppose through the can bus and the new one has a setup for it (the keypad wires in the diagram).
I could replace all the speakerwires and one of the two problems would be solved, but that is the last thing I want to do. Today I also checked the wires from the right front speaker. They were green/yellow and green/grey. I couldn't find them in the connection adapter for my old radio. So I am stuck for now. Is there any way to see for sure if I have a can bus? Where should it be placed?
I think you should do a search on our message board.
The amp would not be in the trunk. If there is an amp it is located up front on the shelf behind the knee bolster on the driver's side (left hand cars).
If you search for "Access stock amp" you will find instructions to see it.
As for CAN-BUS: All 300C are built with the CAN-BUS system. Therefore any radio added to it must be CAN-BUS compatible or require and adapter to make it compatible.
Your advice is really great. It helps me a lot to understand all this. Thanks.
Now comes the question what to do next? I found the amp and I don't want to bypass it. But maybe it could function like this: on the new car diagram you see a wire for a external amp. On the diagram of the old radio you see 2 power cables and a radio on (acc). I only use at the moment 1 power cable and the acc cable. If I would connect the ext amp cable to the second power cable, could that activate the amp? Or would it even be better to connect the ext amp cable to the acc cable?
Am I right in understanding that if I could do the above trick and power on the amp I then would have sound?
I am not certain, but I do not believe there is an acc connection. CAN-BUS does this function. So instead of connecting ACC to Radio-On, you should probably connect the
radio antenna from the new radio to this. Then you need to find a switched accessory lead (such as rear fuse 35 or fuse 18 in the ignition on position) to connect to ACC.
I'm also concerned about the Keypad wires being connected to CAN+ and CAN- on the radio.
Are you absolutely sure the Keypad studio are CAN-BUS connections?
It's probably best if you can locate a PAC C2R-CHY4 as this would make the proper connections for what you are trying to do.
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