Circuit Testing

Turn ignition on. Using a voltmeter, measure voltage (backprobe) between ground and pin No. 5 (Red wire) at master power window switch while holding left front control button in UP position. If battery voltage is present, go to next step. If battery voltage is not present, replace master power window switch. Retest system.
Measure voltage (backprobe) between ground and pin No. 3 (Green wire) at master power window switch while holding left front control button in DOWN position. If battery voltage is present, go to next step. If battery voltage is not present, replace master power window switch. Retest system.
Check for battery voltage at pin No. 1 (Red wire) of left front window motor with left front control button in UP position. If battery voltage is present, go to next step. If battery voltage is not present, repair open or short to ground in Red wire between master power window switch and left front window motor. Retest system.
Turn ignition off. Using an ohmmeter, backprobe between ground and pin No. 2 (Green wire) of left front window motor with left front control button in UP position. If continuity is present, replace left front window motor. If no continuity is present, repair open in Green wire between master power window switch and left front window motor. Retest system.