Samsung WA45M7050 Fast Track Troubleshooting page 16

Resistance pins 1 & 2, 1 & 3, 2 & 3 between 10 to 12 ohms.
Drain Motor Pump Check
Check Voltage at Pin #3 of CN1 and Pin #5 of CN4
When Drain Pump operates = AC 120V
Water Valves/ Check
Check Voltage at Pin #3 of CN1 and Pin #1,2,3,4 of CN4 When Valves operates = AC 120V
Clutch-Motor
Check Voltage at Pin #3 of CN1 and Pin #8 of CN4
When Valves operates = AC 120V
AC Power Check
Check Voltage at Pin #1 and #3 of CN1
Tester Check = AC 120V
Door Lock Check
Check Voltage at Pin #3 and #5 of CN8
When Door Lock = DC 6.5V
Main PCB