Hopefully someone out there - particularly other 156 owners in the Southern Hemisphere - may have dealt with this problem before...?
In Singapore, cars have an IU fitted to the inside lower-right corner of the windscreen. The grey plastic electronic box has a 12V supply and reads a smart card to deduct toll charges automatically when passing under road gantries. The IU must be fitted or removed only at an approved installation centre, and has a tamper-evident seal.
When the cars are scrapped (i.e. sent to New Zealand or other third-world countries for disposal on the second-hand market
) the IU is still there.
The IU slides into a plastic bracket. VHB (Very High Bond) 3M tape holds the bracket to the windscreen. On my 166, I tried to pull the bracket off - no such luck, both sides broke off leaving the main surface (about 6 x 4cm) attached. For some reason, I didn't want to pry the bracket off with a screwdriver. The risk of damaging the windscreen seemed too great. I tried heating it - dream on - VHB holds strips onto Airbus wings and a bit of temperature change has no effect at all
My 156 has an IU as well and I get asked about it daily. I'd like to remove it but am dreading the task... who would have thought that a square of double-sided tape could be such a miserable problem? Maybe I have to take out insurance with windscreen cover, and then use a hammer to remove it!
So hopefully someone out there has actually removed an IU without breaking the windscreen... ?
BTW I see most Singapore-import cars for sale still have the IU, even at dealers that have had the cars expensively groomed. Looks like even the pros don't want to touch them...