Turn the ignition key to ON and connect a multimeter to contacts (3) and (6) and then to (2) and (5) to check for electric continuity. Resistance value taken by the multimeter should be close to zero and, if available, a continuity beep should be heard.
Turn the ignition key to PARK and connect a multimeter to contacts (1) and (4) and then to (3) and (5) to check for electric continuity. Resistance value taken by the multimeter should be close to zero and, if available, a continuity beep should be heard.