It could be the Pioneer App Radio 4, I had a JVC deck that refused to work with the AWSC-1 after a firmware update, the AWSC-1 might need to be updated to work with the newer Pioneer.
One thing they could try, since they're spending so much time on it, would be to install another deck to confirm it's the Pioneer or the AWSC is the problem.
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2016 Nissan 370z Base 6MT Pearl White | RJM Performance
2012 Kia Sportage 6AT (the short bus)
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