So, as stated earlier in thread, my 2020 Caravelle has both aux water heater and air parking heater.
My Eber parking heater seems to use Webasto lin bus fob.
Here are my vcds scans from last year
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Address 18: Aux. Heat (J364) Labels:* Redir Fail!
Part No SW: 5WA 963 271 A HW: 5WA 963 271 A
Component: STH-VW37x 006 0010
Serial number: 000000000000015
Coding: 7143221854121512DCE519
Shop #: WSC 00000 000 00000
ASAM Dataset: EV_AuxilHeateWOSVW38X 001009
ROD: EV_AuxilHeateWOSVW38X_001_VN3S.rod
VCID: 4ACD67C2CC33823A917-801E
2 Faults Found:
0036 - Fuel Level too Low
P1250 00 [096] - -
Intermittent - Not Confirmed - Tested Since Memory Clear
0169 - Coolant temperature
B138E 4B [096] - Over Temperature
Intermittent - Not Confirmed - Tested Since Memory Clear
-------------------------------------------------------------------------------
-------------------------------------------------------------------------------
Address 800B: Aux air heater 2 (J604) Labels:* None
Part No SW: 7C0 963 273 B HW: 7C0 963 273 B
Component: LSH_DIESEL 006 0026
Dataset Number: 0026 0026
Coding: 3200
Shop #: WSC 00012 790 00075
ASAM Dataset: EV_LSHECCSMNB 002018
ROD: EV_LSHECCSMNB_002.rod
VCID: 2A0D07426C73A23A717-807E
Auxiliary heating remote control:
Subsystem 1 - Part No SW: 3Q0 963 513 HW: 3Q0 963 513
Component: R64 D208L 004 0402
Serial number: 00000000000001021196
1 Fault Found:
0548 - Combustion Air Blower
B1384 19 [008] - Current Too High
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 4
Fault Frequency: 1
Reset counter: 1
Mileage: 19810 km
Date: 2023.02.15
Time: 08:00:18
Haeufigkeits_zaehler: 1
Betriebsstunden_zaehler: 2756
Gluehstift_einschaltungen: 187
Start_wiederholungen: 2
Betriebszeit_Hoehenanpassungsbetrieb: 0
Aktueller_atmosphaerischer_Luftdruck: 1012.6 hPa
Versorgungs_spannung: 10.6 V
Betriebs_modus: Auxiliary_heating_LSH
Betriebs_zustand: First_start
Sequenz_abschnitt Start: 8
Sequenz_abschnitts_zeit_Start: 0.96 s
Sequenz_abschnitt_Nachlauf: 0
Sequenz_abschnitts_zeit_Nachlauf: 0.00 s
Luft_eintritts_fuehler: 1.25 C
Luft_austritts_fuehler: -0.00 C
Flamm_fuehler: 2.50 C
Externer_Luft_fuehler: -41.19 C
End----(Elapsed Time: 20:25, VBatt start/end: 12.1V/11.9V. VIgn 11.9V)-----
Not sure what the faults were but it works fine.