I am using a maxisys elite but cannot scan the antenna control module.  They are not manufactured anymore so I am using junkyard parts.  I have a lot of communication errors on the class two serial data buss.  U1300 on the ECM and U1000 on most of the rest.  The only one that never fails is the rear integration module.  I have checked continuity of the serial data buss, power supplies and ground.   The data bus is not shorted, pulses are visible on the scope.  I have pulled out the complete interior and checked for corrosion.  The sunroof has been leaking for a while.  I found some corrosion, removed the splice packs and soldered the wires together.  The ECM was defective when the car was towed in.  The anti theft module was also defective and replaced.  The ground for the dash integration module was at 175mv with respect to ground so I repaired it and now it's at 65 mv when compared to the ground post on the battery.  All the other controllers are around the same value.  I even tried an auxiliary ground on the ECM.  The car will start but the ignition key is locked and you cannot shift out of park.  Any advice would be greatly appreciated.  Tomorrow I am going to try to get another antenna module from the local salvage yard.