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Also the switch might be faulty

Can you post full autoscan without removing the header? There’s important info about the interface and it’s versions.

you need to finish the basic settings after coding, otherwise it will clear the codes. G85 is not enough. You also need to do longitunal and lateral acceleration sensor basic settings. What code are you trying to input? It's been a while since I've done any EC1 units but if I remember...

I think @Uwe was only referring to one of the submodules. Based on your scan there's nothing wrong with the module 55. Only one of the submodules is complaining. Can you clear all dtcs and take a fresh scan and post it here?

Nope. In module 13, check that there no traffic sign recognition is coded

1 Fault Found: 0836 - Databus U1123 00 [00001001] - Received Error Message [FAULT_PREDICTIVE_ROUTEDATA_SIGNALERROR_RECEIVED] Confirmed - Tested Since Memory Clear Freeze Frame: Fault Priority: 6 Fault Frequency...

Well, not really clear from OP’s description. Something something, ACC does not work, advice to replace radar, again something something, original radar in then maybe a crash damage car or not, something about trailer not installed but is coded in several modules and so on.

^ that’s correct! Incorrect trailer coding kills ACC

^ pretty much spot on. Rest heating with PTC heater would kill the 12v battery in few minutes. Only possible with auxiliary fuel heater (factory installed) and even with those not always possible. I had 2017 Tiguan with factory installed webasto fuel heater and that did not have rest function...

Yes. Most probably OP has not cleared the errors before taking a scan. The timestamp of that error is from 2019. Or another option is that the laptop time is off pretty badly :)

As @Dr Sheldon wrote. Fix those and most probably errors gone. Almost all errors on other modules relate to those two

Write the coding of 55 again to the unit. Just write the same code. It should code the submodules at that time.

Does it start again? :) Have you tried clearing the code from BMS?

Why just not buy an used oem shark fin with gps antenna? Easy swap and also problem solved :) Those 3rd party antennas are a bit iffy

https://openinverter.org/forum/viewtopic.php?t=1525

Most likely inside the battery :(

Because there's crash shut-down signal active : 8526363 - Crash Shut-Down B189C F0 [00001001] - Active Confirmed - Tested Since Memory Clear Freeze Frame: Fault Priority: 4 Fault Frequency: 1 Reset counter: 197 Mileage: 155506 km Date: 2025.03.24 Time: 00:01:20 Terminal 30 power supply: 11.9 V...

@AINils you're right. But I want to add to your statement that ",and also if you know what you are doing" :)

Ok, then you need to reset it. For that you probably need something else than VCDS

In 4B adaptations make sure this is activated : IDE03641-Presentation run dynamic AFS light