B1294-1A: Speaker #23 - Circuit resistance below threshold: Action

NOTE: Only applies to vehicles fitted with a Meridian® Reference sound system. There is no speaker connected to this output channel

Check for debris or contamination or if any cables or speakers are connected to this channel. Repair circuit as required, clear DTC and retest
If fault persists, configure the audio amplifier to the latest software level and retest.
If fault persists and if no evident issue is seen, install a new audio amplifier module as required. Clear DTC and retest