Set Appliance State:
Isolate Mains Power to appliance as per TOPs P4
Remove Front Panel of Electrical Control Box
Remove Front Panel of Electrical Control Box
Measurement:
Depress Ignition Switch
Measure open circuit resistance across Orange and White wires of Ignition Switch.
Release Ignition Switch
Measure short circuit resistance across Orange and White wires of Ignition Switch.
Measure open circuit resistance across Orange and White wires of Ignition Switch.
Release Ignition Switch
Measure short circuit resistance across Orange and White wires of Ignition Switch.

Isolate as per TOPs P4
and refit as necessary