Rear HVAC Coding - Heated Rear Seats Inoperable
 

My heated rear heated seats have not worked at all to my knowledge and a few weeks ago, I had a rear seat airbag fault so took out the rear seat and cleaned and reseated the connection which cured the (commonish) problem.

While I was there I checked the rear heated seats connector for ohms and they were fine with a low resistance which matched their wattage.

When I turn on the rear heated seats, the button illuminates and the number 1-6 appears on the LCD but goes off after a couple of minutes and doesn't get hot.

When I look at rear HVAC 28 in VCDS it has two fault codes :
Rear vented seat left no communication
Left vented seat left no communication
but the seats are not vented.

The coding for rear HVAC is 000000 and general HVAC is : 0084051
but there is no helper in VCDS:


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Address 08: Auto HVAC Labels: None
Part No SW: 4E0 910 043 B HW: 4E0 820 043 D
Component: KLIMAAUTOMAT 016 0400
Revision: 00000030 Serial number: 00000000082085
Coding: 0084051
Shop #: WSC 02311 785 00200
VCID: 1C3C5DD5DFFD51FE72B

No fault code found.
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Address 28: HVAC, Rear Labels: None
Part No SW: 4E0 910 158 HW: 4E0 919 158 B
Component: KLIMA-STG. FOND 015 0220
Revision: 00000018 Serial number: 00000000035103
Coding: 0000000
Shop #: WSC 00000 000 00000
VCID: E1C2AC21381FBC1661D

2 Faults Found:
02291 - Control Module for Seat Vent; Rear; Driver Side (J674)
004 - No Signal/Communication
02292 - Control Module for Seat Vent; Rear Passenger Side (J675)
004 - No Signal/Communication

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Any advice appreciated.