B1A04-1A: Speaker #4 - Circuit resistance below threshold: Action

Refer to the applicable SYSTEM WIRING DIAGRAM(S) and check the wiring harness and connectors on the front right bass speaker circuit. Repair circuit as required, clear DTC and retest
If fault persists, check and install a new speaker as required. Clear DTC and retest
If no harness or speaker faults are evident, check and install a new audio amplifier module as required. Clear DTC and retest