Tesla Model 3 Rear Glass Defroster Not Clearing

Verify the failure by activating the rear defroster via the touchscreen and checking if the exterior side mirrors warm up. If the mirrors heat but the rear glass remains frosted, the issue is isolated to the rear window circuit. Confirm the fault by accessing 'Service Mode' to check for logged Diagnostic Trouble Codes (DTCs) such as VCRIGHT_a342 or VCRIGHT_a344.