DTC B128B-13: Speaker #14 - Circuit open: Action

Refer to the applicable SYSTEM WIRING DIAGRAM(S) and check the rear right surround speaker circuit for open circuit, high resistance. Using the manufacturer approved diagnostic system, clear the DTCs and retest. If the fault persists, install a new rear right surround speaker as necessary
Using the manufacturer approved diagnostic system, clear the DTCs and retest. If the fault persists, install a new audio amplifier module