Ford B166a60 〈2K〉

: The door control module has detected an "open circuit," meaning the electrical path to the heating element in the side mirror is broken or disconnected. Common Causes

You might not always see a "Check Engine" light for a body code, but you will notice these performance issues: ford b166a60

Once your diagnosis pinpoints the breakdown, resolve the issue using the matching remedy below: : The door control module has detected an

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 Note that new BLIS sensors often require "programming"

Installing a thick seat cover, heated seat pad, or replacing the factory foam with non-OEM material changes how pressure distributes across the OCS mat, causing irrational signal outputs.

If a sensor is dead, you can find genuine OEM replacements at Ford Parts. Note that new BLIS sensors often require "programming" to match your VIN. Frequently Asked Questions Body Control Module / BLIS Common Models F-150, Bronco, Mustang, Explorer DIY Difficulty Moderate (requires scanning tool) Typical Repair Cost $150 (flash) - $800 (sensor replacement)