GSM Module location

[The Verb]

Hello All

I have an 18 plate S3 sportback with a fault GSM antenna 2 open circuit. The modules are in the rear bumper, one on each side. Does anyone know which is no 2 please?

Thanks in advance. 

[Sid2020]

Not sure about the A3 but my understanding is antenna 1 is in the roof fin and antenna 2 is behind rear bumper bolted to the rear panel, typically on left hand side 

[The Verb]

Hi

Thanks. The fin is GPS. I can see the GSM modules left and right however the connectors are flimsy so chances are I will damage them if I touch them. 

[Sid2020]

Should be fakra connectors, give them a spray of wd40 and wait 10 minutes. Use a small pick to help release the tab

[The Verb]

Thanks, will do. Still need to know which is which as I don’t want to break into a serviceable system. 

[Sid2020]

If you have your own diagnostic I would just unplug one at a time and check for codes each time to pin point which is 1 and 2, Should just give a open circuit fault code that clears when reconnected, replace these a lot from rear collision damage and never have a problem afterwards