Purchased Carplay unit for 2011 L322 with no instructions and the AliExpress vendor ghosted - these units seem all seem the same, like this one.
There are some great related threads but they don't have installation details. I have done basic carplay install in my other car without CAN bus integration and little guidance will be appreciated:
1) "SIM card and AV harness" has the following composite ends: Audio OUT L and R, AUX IN L and R, Video OUT, CVBS-IN-1. Usually, composite output is used to send unamplified signal to factory amplifier. Unfortunately, there are only two audio out cables (L and R) instead of 4 that I have seen before (F and R included). Is this expected? And are those two audio cables going into the Head Unit replacement ( #3 question below)?
1a) Same AV harness has a blue wire (without composite head) - not sure what it is
2) There are loose wires from the main harness (right next to the CAN BUS DECODER in the first picture) - these are usually for preamp outputs (that will not be used) but there are three additional wires: "back", "key 1" and orange with white stripe that I don't understand the purpose for.
3) The blue box (Head Unit Replacement) has two composite inputs. According to pictures that one of the vendors sent (further below), it connects to two outputs from the "SIM card and AV harness". What are these for?
There are some great related threads but they don't have installation details. I have done basic carplay install in my other car without CAN bus integration and little guidance will be appreciated:
1) "SIM card and AV harness" has the following composite ends: Audio OUT L and R, AUX IN L and R, Video OUT, CVBS-IN-1. Usually, composite output is used to send unamplified signal to factory amplifier. Unfortunately, there are only two audio out cables (L and R) instead of 4 that I have seen before (F and R included). Is this expected? And are those two audio cables going into the Head Unit replacement ( #3 question below)?
1a) Same AV harness has a blue wire (without composite head) - not sure what it is
2) There are loose wires from the main harness (right next to the CAN BUS DECODER in the first picture) - these are usually for preamp outputs (that will not be used) but there are three additional wires: "back", "key 1" and orange with white stripe that I don't understand the purpose for.
3) The blue box (Head Unit Replacement) has two composite inputs. According to pictures that one of the vendors sent (further below), it connects to two outputs from the "SIM card and AV harness". What are these for?