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The manual shows the speaker location does not change with different models or configuration. The Forscan mobile app will show all error codes and you can read all data points (PIDs). You just can't make any configuration or programming changes.

Here is information and wiring diagrams for the heated mirrors. The "door modules" referenced are the driver and passenger door modules DDM, PDM. You need these for heated mirrors. The door modules get a CAN message from the BCM to activate the mirror heaters. Of course the heaters need to be connected to the modules. You know you have door modules if your power windows have the one-touch up/down feature. The modules are located in the top front of the doors. htd mirror operation.pdf mirror wiring.pdf htd mirror 2.pdf This post shows the DDM.

This may be more involved than you expected. The switch send signals to the body control module (BCM) and the BCM sends power to the defroster and mirrors. The BCM has programming that may need to be configured or activated. I'll look for the wiring diagrams but the configuration may require Forscan (see posts on this forum) and some research or trial and error testing. The good old days of a switch sending power directly to a relay are gone. Everything goes through a module and switches send network messages (they really aren't switches as we used to know) to the computer modules.