Replace the Accessories Relay located in the IPM Fuse and Relay box located in the Engine Compartment. There should be an Spare Relay that is the same Type (size and shape). If no Spare Relay select a non-engine operation Relay that is the same Type and switch-out the Accessory Relay for this one. For example the Rear Blower Motor Relay. Then check the operations of the Headlights, all gauges, inside lights and wipers. And check the Rear Blower. If the Headlights ect work now, it was a bad Relay and should be replaced. Especially if the Rear Blower Motor is rendered useless.
Also forgot to add: There is a Junction Box located under the left side of the Dash. First check here, as snow got into your dash and water most likely has gotten into this area/box. These Relays and Fuses should be checked first before going to the IPM which is actualy called a PDC Power Distribution Center in the engine compartment.
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