Test C: Left Rear Or Right Rear Window Does Not Operate From Master Switch Only

1. For left rear window, connect a test light between terminals "D" and "M" of power window master switch connector. For right rear window, connect a test light between terminals "K" and "L" of power window master switch connector. See Figure. Operate appropriate window switch in UP and DOWN positions. If test light is on in both positions, go to next step. If test light is off in either position, replace power window master switch. See WINDOW MASTER SWITCH  under REMOVAL & INSTALLATION.
2. Connect a test light between terminals "A" and "D" of appropriate rear window door switch. See Fig 1. Operate window master switch in UP and DOWN position. If test light is on in both positions, replace rear door window switch. See DOOR WINDOW SWITCH  under REMOVAL & INSTALLATION. If test light is off in either position, repair open in wiring between power window master switch connector and rear door window switch connector. See WIRING DIAGRAMS .

Fig 1: Identifying Rear Door Power Window Switch Connector Terminals

Courtesy of GENERAL MOTORS CORP.