I've disconnected my battery plenty of times, some for quite a duration. Never been asked for it except for when I first retrofitted it (I have the code card with me delivered with the unit from ebay).
I downgraded the fw today to 3810 (GPS is still not working) and I have a strong suspicion that my antenna is disconnected at the antenna end. Now it shows 0/0 satellites so it doesnt see them, doesnt connect to them. That number of seen satellites previously was the last seen satellites when it was working. So if the unit actually doesnt see the satellites, means the highly likely the antenna is either faulty (factory sharkfin) or disconnected. The theory about the head unit sw has got "crazy" is not likely the case in my opinion, because the unit was working perfectly for a month.
I have a hypothesis: a week ago I pumped up the wheels to 250kPa, (usually it should be around 230) but then didnt carry anything heavy so the car became much more sensitive for road imperfections and therefore the bigger vibrations could cause my loose antenna connection.
I am pretty sure disconnecting the battery will not solve the problem as well so I am looking forward bringing the car to VW next week and they will tell me what is the issue.
Ps. I also went through the radios and some of the channels (like Nova), which were crystal clear before, now has a little bit of static noise in the background, which means possible antenna issue, because the radio antenna and the GPS antenna is integrated.
MY18 VW Tiguan Comfortline
MY18 VW Tiguan Comfortline
MY16 Touareg 4.2Lt V8 TDI/Pure White LED lightbox/REDARC Brake Controller/ Racechip/iDrive Throttle controller
2008 GOLF .:R32/5DR DBPE DSG/SUNROOF/RNS510/PRIVACY TINT/CONTI SC3s/MILLTEK CATBACK NON-RES/9W2 BT/"MYR-032"
ill put my money on a failed shark fin.
It could be you disturbed the wires in the plug that goes into the headunit.
Much more likely than problems at the aerial end which wasnt touched.
I would carefully check all of them. before attacking the aerial end
2021 Kamiq LE 110 , Moon White, BV cameras F & B
Mamba Ebike to replace Tiguan
MY16 Touareg 4.2Lt V8 TDI/Pure White LED lightbox/REDARC Brake Controller/ Racechip/iDrive Throttle controller
2008 GOLF .:R32/5DR DBPE DSG/SUNROOF/RNS510/PRIVACY TINT/CONTI SC3s/MILLTEK CATBACK NON-RES/9W2 BT/"MYR-032"
I was thinking more of where the wire goes into the connector Have seen more than one like this when pulled out incorrectly has either fractured or bent and separated the wires from the connector Would need metering out for connectivity Only takes one strand of a shield on coax to short it out as I have found to my sorrow
2021 Kamiq LE 110 , Moon White, BV cameras F & B
Mamba Ebike to replace Tiguan
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