Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Unplug the electrical connector from the pump assembly

Measurement:

Test 1.
Measure the resistance between pin 1 (black) on the
pump electrical connector to the black wire on
connector CN25.
Test 2.
Measure the resistance between pin 2 (brown) on the
pump electrical connector to the brown wire on
connector CN25.
Expect continuity / zero resistance on each test.
Also visually inspect the condition of the harness.