Drivers door master switch issues are common. Driver door wire harness issues are common. The Viper complicates your troubleshooting, especially if the installer was a moron.
You need to do some investigating and locate the cause of the problem, or eliminate one or more of the most common causes of similar problems.
Grab your volts/ohms multi-meter and test for wire continuity, and for power/ground in the correct places. You may want to unplug or disable the Viper and see if that is the cause.
Progressive Liberalism: Bringing you new ideas so wonderful, they have to include mandatory participation ......
Originally Posted by Ronald W. Reagan: Government is not the solution to our problem; Government is the problem.