V90/XC90/S90 HK AUD .VBF Files

[spacemanspiff]

The plot thickens....I decided to disconnect the C connector in its entirety. I got the following codes then:

B1A0113 left-hand front door
B1A0213 right-hand front door
B1A0313 left-hand rear door

B1A0513 [unknown]
B1A0613 central
B1A0713 sub element 1
B1A0813 sub element 2
B1A0913 [unknown]

Now the weird thing is, per the online DTC reference sites, B1A0413 is the right-hand rear door. Now if the C connector is completely unplugged why did I not get that fault code as well??

Additionally, the sub element 1 and 2 does not make any sense to me. The sub gets two wires like the rest of the speakers, how does it have different elements with distinctive fault tracing at the AUD?

I'm beginning to wonder if the switch from HP to HK is not perfect in terms of swapping the AUDs, changing software, configuration, and you are left with some DTC ghosts as a result of the process.

That said, I will try reversing some polarity on the central speaker and sub to see if that does anything.

Below codes show up as Land rover audio codes. 

B1A0513 > Speaker #5 •Left Subwoofer Circuit - High Impedance
B1A0913 > Speaker #9 Surround speaker left left circuit - high resistances

Pulling the plug completely may trigger other DTCs  Instead, disconnect the plugs from the speakers one by one. 
You need to understand one thing though. How those DTCs are set . 
When you open the car, IHU boots up and sends a MOST command to AUD to turn on. 
While AUD is booting up, it sends low test signals to each channel. If that test signal does not come back on time than it sets the DTC.  AUD does not recheck afterwards until a next reboot and does not turn off the channel that set the DTC. 

If your wiring has very high resistance or the speaker itself has a high resistance due to some connection corrosion, wiring or internally, it would set that DTC.  
Reversed polarity can also cause this issue.  If you still have the problem, garb a multi meter and measure the ohm of the speakers, they should be steady, If they are jumping around, you'd know you have a problem.  If you do not have multi meter,  take one of the tweeters and connect it to the center. See if it clears the code or not.  
Surround speaker left left circuit - high resistance

Great, its throwing Land Rover codes!!

Ok thanks for the primer about the DTC system. That explains some quirks. I wonder if having BW mid range speakers on the front door with their capicitators, whereas the HK mids have none, is a factor.

In any event, any tips about how to remove pins from the C connector? I'm having a bear of a time trying to get them out. They were easy to add when I did the retrofit, but I didn't have to remove any then. I pulled that white retainer clip off the front. But then I can't get any thing to budge!