So I’ve started on my journey to add wireless CarPlay to the existing MMI system and screen. No screen replacement at this time. I’m hoping to do this on the (relative) cheap with a unit I bought off of Amazon for well under $300 shipped.
Assuming everything eventually works, I’ll turn this into a DIY thread for everyone else.
While I’m waiting for the new updated RS Nav units to be released, I found a very cheap wireless mirroring system on Amazon, specifically the Carlinkit.
Before you go and order it, know that it did not work as delivered so a bit of a spoiler. But read on, there’s hope.
I believe they sent me the wrong wiring harness patch. I’ve sent them a ton of information so hopefully they have the correct harness. My was labeled Q5 but I believe the S5 (2013+) MMI is identical to the RS5’s.
The instructions were very poor and I practically needed a mangnifying glass to read the type. I ended up pulling the MMI unit out and took a bunch of photos. Thought this would be a good process to document for others. Note, the 2014 and on MMI is slightly different. I don’t know if the connectors on the back are any different from the 2013.
The main harness splice did fit. It essentially sits in between the MMI and factory harness and plugs into the Carlinkit box. It had two additional plugs coming off the splice however, and there wasn’t anything to plug it into. The kit also contained one additional USB/Video/Audio and wiring harness which didn’t have anything to plug into on the RS5 either.
I don’t know what each plug is for. I need to look over the wiring schematics and haven’t done so yet.
The violet, blue and green plugs are all single pin antenna-type plugs. The green one is not utilized.
The yellow and gray plugs, which are four pin male, are also unknown but I know at least one is the back up camera and I’m guessing the other is the front parking sensors.
The plug on the far right is an optical plug. Guessing this is how the sound signal is delivered to the amp. The big plug on the right is the main harness interface plug.
This is the Bluetooth transmitter making it wireless. You basically conceal this somewhere behind the dash where it isn’t shielded by metal. I haven’t gotten that far yet. Want to make sure it’s working before I decide to take the glove box out. With that said, it appears there’s enough room behind and below the MMI for the Carlinkit box and wires.
I’ll post updates once I get a reply back from the vendor. Hopefully this’ll work and it’s a nice, cheap alternative stopgap until the new RS Nav units are released.
I’m rummaging through the FSM trying to find the corresponding numbers to see what each does.