Engine Block Heater Testing
WARNING: This page is about a different car, the 2011 Dodge Grand Caravan and 2011 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
If unit does not operate, test power cord for continuity with a 110-volt voltmeter or 110-volt test light. Test heater element continuity with an ohmmeter or 12-volt test light.