Test 1

With ignition switch in RUN position, connect a test light between master switch Brown wire connector terminal and ground. If light comes on, go to step 2). If light does not come on, check for poor connection at master switch. If connection is okay, repair open in Brown wire between POWER WINDOW (30-amp) circuit breaker and master switch.
Connect a test light between master switch Brown wire connector terminal and master switch Black wire (ground) connector terminal. If light comes on, check for poor connections at master switch. If connections are okay, replace master switch. If light does not come on, check for poor connections at master switch. If connections are okay, repair open in Black wire between master switch and ground.