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check fuse 14 in the fuse panel on the left end of the dash. 10a small fuse, red.
your comfort module is not operating anything.
so if the fuse is ok, check under the carpet for water on the driver side
Check to see if you have power and ground to the comfort module- large red and brown wires at the end of the connector, pins 1 and 2. Can I assume that you pulled the dash completely to do the heater core?
Let me have your VIN and I can look up info specific to your build data
yeah, anything after about 2002 the radio will automatically recognize if it is in the same car, due to the communication protocol and new Immobilizer generation.
The brake pad wear indicator will likely come on after you start driving. The airbag light is likely on because it detected a fault in communication between the cluster and the airbag module, just clear the fault and it should be OK.