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The suffix indicates a specific failure type. For , -60 denotes an "Open Circuit," meaning the module detects a complete electrical break in the heated mirror circuit.

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If you see full voltage but the mirror won’t heat up (and your glass tested fine), use fine-grit sandpaper to clean away any corrosion on the metal contacts. Apply a dab of dielectric grease to prevent future moisture damage.

The code remains stored in the PDM or DDM, visible only when running a specialized diagnostic test.

Diagnosing the B166A60 code can be challenging, as it requires specialized tools and expertise. Here are some steps that mechanics may take to diagnose and repair the issue: ford b166a60

PDM (Passenger Door Module / Passenger Door Control Unit). Description: Heated Mirror Circuit Open.

Seals on the tail lights or mirrors can leak, causing electrical shorts in the communication lines. Symptoms to Look For

Check the multimeter reading. It should briefly show around .

Demystifying the Ford B166A-60 Trouble Code: Causes, Symptoms, and Complete Diagnostic Guide The suffix indicates a specific failure type

Connect the multimeter probes to the two wires that plug into the mirror glass.

Footwell or door handle lights may flicker or remain dim.

Here's a general diagnostic and repair guide:

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Understanding Ford DTC B166A:60: Heated Mirror Circuit Open If your Ford vehicle is displaying the diagnostic trouble code , it indicates a specific issue within your vehicle’s comfort and convenience features, specifically related to the side mirrors.

When the Passenger Door Module registers an open circuit, it means the electrical path running from the module to the mirror and back to the ground has broken. The most frequent causes include:

If no power reaches the mirror, inspect the wiring loom between the door and the car body. Pull back the rubber accordion boot in the door hinge and look for any frayed, pinched, or completely severed wires. Repair any damaged copper wiring using automotive-grade solder and adhesive-lined heat shrink tubing. Summary Table Diagnostic Step Tool Required Expected Result Action if Failed OBD2 Scanner / FORScan Identifies PDM or DDM source Isolate to correct door panel Glass Resistance Test Digital Multimeter Replace mirror glass if Open Loop (OL) Voltage Supply Test Digital Multimeter when turned on Inspect wiring harness or door module Harness Inspection Visual inspection No broken or frayed wires Solder and heat-shrink severed wires