Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Remove power electrical connector from fan assembly
Removing side panel from appliance will make this test considerably easier to carry out

Measurement:

Test 1.
Measure for resistance across pins 1 and 3 of fan connection.
Expected resistance greater than 1MΩ (or O.L)
Test 2.
Measure for resistance across pin 1 and 2 fan connection.
Expected resistance greater than 1MΩ (or O.L)