V90/XC90/S90 HK AUD .VBF Files

[spacemanspiff]

Each speaker has an impedance (ohm).  If  you have 2 speakers of 4 ohm each wired toghether, you obtain an 2 ohm impedance on that chanel. If you only have 1 speaker,  remains 4 ohm on that chanel, and AUD  send a fault code

Would that cause the B1A06(13) DTC though? The (13) implies an open circuit, whereas (11) or (12) looks like an incorrect reading. If the AUD detected just the impedance of the tweeter vs. the combined impedance of a tweeter and mid or no impedance at all, wouldn't it throw one of the other faults as opposed to open circuit?