OBD Guide
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B1F05

Electrochromatic Mirror Control Circuit

B1F05 is an OBD-II diagnostic trouble code meaning: Electrochromatic Mirror Control Circuit. Common causes: open or short circuit in wiring harness, electrochromic mirror malfunction. Estimated repair cost: $56–167.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Electrochromic mirror does not dim
  • The mirror does not darken correctly
  • Flashing or unstable mirror operation

Causes

  • Open or short circuit in wiring harness
  • Electrochromic mirror malfunction
  • Problems with the mirror control module
  • Light sensor malfunction
  • Blown fuse

How to Fix

  1. Check fuses associated with the mirror
  2. Inspect the wiring harness for damage
  3. Check the operation of the light sensor
  4. Test an electrochromic mirror
  5. Replace faulty components

Related codes

B1F06B1F07

FAQ

What does the B1F05 code mean?

B1F05 is an OBD-II diagnostic trouble code that indicates: Electrochromatic Mirror Control Circuit

What causes a B1F05 error code?

The most common causes of B1F05 include: Open or short circuit in wiring harness; Electrochromic mirror malfunction; Problems with the mirror control module; Light sensor malfunction.

How do I fix a B1F05 diagnostic trouble code?

To fix B1F05: Check fuses associated with the mirror. Inspect the wiring harness for damage. Check the operation of the light sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1F05?

Do not drive — repair immediately

How much does it cost to fix B1F05?

The estimated repair cost for B1F05 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat