Tapping into speaker wire B Pillar? 2018 CX-5 Non-Bose

2018 non Bose. I know I can get in at the TPU but don’t trust myself with the small amount of wire available there. I know somewhere in this connector going to the rear door wiring is leads for the rear speaker. Does anyone have a pin-put diagram or able to tell me what colors here are for the rear speakers? Open to suggestions if you know an easier place to tap in.
 

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