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No Sound Output In Multiple Modes [Entertainment System [With Center Display]]: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
NO SOUND OUTPUT IN MULTIPLE MODES (ENTERTAINMENT SYSTEM - WITH CENTER DISPLAY) - DESCRIPTION & POSSIBLE CAUSES

Description NO SOUND OUTPUT IN MULTIPLE MODES
Radio, CD, AUX audio is output, but no Bluetooth ® audio, Internet radio, USB audio, and guidance voice
Possible Causes
  • Connector poor contact or terminal damage
  • Open circuit in wiring harness between the following terminals:
    • Connectivity master unit (CMU) terminal 1Y and tuner and amp unit (TAU) terminal 1Q
    • CMU terminal 1Z and TAU terminal 1R
    • CMU terminal 1AA and TAU terminal 1S
      • CMU terminal 1AB and TAU terminal 1T
  • Short to ground in wiring harness between the following terminals:
    • CMU terminal 1Y and TAU terminal 1Q
    • CMU terminal 1Z and TAU terminal 1R
    • CMU terminal 1AA and TAU terminal 1S
      • CMU terminal 1AB and TAU terminal 1T
  • Short to power supply in wiring harness between the following terminals:
    • CMU terminal 1Y and TAU terminal 1Q
    • CMU terminal 1Z and TAU terminal 1R
    • CMU terminal 1AA and TAU terminal 1S
      • CMU terminal 1AB and TAU terminal 1T
  • TAU malfunction
  • CMU malfunction