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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1591 (Rear View Mirrors - Vehicles With: One-Touch Open Driver Window (Except Electric)) >> Description And Operation >> Rear View Mirrors - System Operation and Component Description >> Exterior, Heated

Exterior, Heated

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The rear window defrost switch controls operation of the heated exterior mirror glass (if equipped). The heated exterior mirror glass only operates when the rear window defrost system is active. The heated exterior rear view mirror glass deactivates when the rear window defrost deactivates. The heated mirror glass receives voltage from the rear window defrost relay located inside the BJB. The LH and RH heated mirror glass does not share the same ground. For a detailed description of the rear window defrost system operation, Refer to: Glass, Frames and Mechanisms - Vehicles With: One-Touch Open Driver Window .