Do these cars have power windows? If not, then there won't be any CCM to scan in the first place, you would want to go into address 35 for "Cent. Locks" on cars with manual crank windows.
Whenever I could not get into other modules, it turned out I needed to look at the flaky communications PDF at ross tech and follow it. My laptop does not like too many things running on it with some controllers. YMMV
If you cannot get into 46 on a car that has power windows, try re-booting the whole car. 46 has the nasty habbit of going deaf/dumb on these cars on occasion. Disconnect both cables from the batter. Short the cables together for 10 seconds. Reconnect them to the battery.
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