Ok, I start with a couple infobits if you don't know already:
1. The ignition key needs to be at OFF before the gas door button would work. That said, I do have a 164 that the PO (or somebody) has wired it the opposite way - the ignition key needs to be ON for the gas door button to work.
2. There is an emergency or manual pull string (red in color) inside the trunk that you can use to open the gas door. If it is not visible inside the trunk near the gas door then you need to remove the cover material on that side to find it.
3. If you manually lock the trunk with a primary key (vs valet key) and you have turned it anti-clockwise half a turn (to deny valet access to the trunk) , it will disable the electrical unlock button at the dash.
For the electrical problem, have you check fuse F3 (30A) at the G2 auxiliary fuse box?
1. The ignition key needs to be at OFF before the gas door button would work. That said, I do have a 164 that the PO (or somebody) has wired it the opposite way - the ignition key needs to be ON for the gas door button to work.
2. There is an emergency or manual pull string (red in color) inside the trunk that you can use to open the gas door. If it is not visible inside the trunk near the gas door then you need to remove the cover material on that side to find it.
3. If you manually lock the trunk with a primary key (vs valet key) and you have turned it anti-clockwise half a turn (to deny valet access to the trunk) , it will disable the electrical unlock button at the dash.
For the electrical problem, have you check fuse F3 (30A) at the G2 auxiliary fuse box?