Rear View Mirrors — 2016 workshop reference 942

Refer to Wiring Diagrams Cell 124 for schematic and connector information.

Normal Operation and Fault Conditions

The heated exterior mirrors receive voltage from the rear window defrost system. The heated exterior mirrors only operate when the rear window defrost is on. REFER to: Glass, Frames and Mechanisms - System Operation and Component Description (501-11 Glass, Frames and Mechanisms, Description and Operation).

Possible Causes

Fuse Wiring, terminals or connectors Rear window defrost system concern Exterior mirror

Visual Inspection and Diagnostic Pre-Checks

Inspect the suspect exterior mirror housing and glass for damage.

NOTE: Clean the entire mirror assembly and glass to assist in verification of the customer concern and/or impact damage. Do not clean any mirror glass or housing with an ice scraper, razor blade, abrasive pad, harsh chemicals or petroleum based cleaning products, as these may damage the mirror glass and/or housing.

PINPOINT TEST F : ONE OR BOTH HEATED EXTERIOR MIRRORS ARE INOPERATIVE (WITHOUT

MEMORY MIRRORS)

F1 CHECK THE OPERATION OF THE REAR WINDOW DEFROST SYSTEM

Start the engine. With the engine running, activate the rear window defrost. Using an infrared temperature gun or equivalent, measure the temperature of the rear window glass for approximately 30 seconds, noting changes in temperature.

Does the temperature of the rear window glass rise?

Yes	GO to F2
No	DIAGNOSE the rear window defrost system. REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).

Yes

GO to F2

DIAGNOSE the rear window defrost system.

REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).

F2 CHECK THE OPERATION OF THE HEATED EXTERIOR MIRRORS

With the rear window defrost ON, using an infrared temperature gun or equivalent, measure the temperature of the LH and RH exterior mirror glass for approximately 30 seconds, noting changes in temperature.

Does the temperature of at least one exterior mirror glass rise?

Yes	For inoperative LH heated mirror glass, GO to F3 For inoperative RH heated mirror glass, GO to F5
No	VERIFY that BJB fuse 11 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

F3 CHECK THE VOLTAGE TO THE LH (LEFT-HAND) HEATED EXTERIOR MIRROR GLASS

Source reference 942

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.