You'll know in minutes if the key is taking a charge.
The important joints seemed to be on the IC and the antenna coil. But the switches tend to be suspect as well.
On the bench the best way to test the switches is to measure bat voltage when you press them. The radio takes enough power to drop the voltage. If you don't get a drop the switch or contact to it is bad.
If either of the the main two switches won't click reliably of course you can't program.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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