OBD Guide
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B1D31

Mirror Horizontal Motor Control Circuit Open

B1D31 is an OBD-II diagnostic trouble code meaning: Mirror Horizontal Motor Control Circuit Open. Common causes: broken or damaged wiring harness to the mirror motor, malfunction of the horizontal adjustment motor. Estimated repair cost: $22–111.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Side mirror horizontal adjustment does not work
  • Mirror does not move left/right
  • Possible clicks or complete lack of response when trying to adjust

Causes

  • Broken or damaged wiring harness to the mirror motor
  • Malfunction of the horizontal adjustment motor
  • Problems with the mirror control unit
  • Oxidation of contacts or connectors

How to Fix

  1. Check the integrity of the wiring harness to the mirror
  2. Check the voltage at the motor connector when trying to adjust
  3. Check motor resistance
  4. Inspect connectors for oxidation
  5. Replace motor or wiring harness if necessary

Related codes

B1D30B1D32B1D33

FAQ

What does the B1D31 code mean?

B1D31 is an OBD-II diagnostic trouble code that indicates: Mirror Horizontal Motor Control Circuit Open

What causes a B1D31 error code?

The most common causes of B1D31 include: Broken or damaged wiring harness to the mirror motor; Malfunction of the horizontal adjustment motor; Problems with the mirror control unit; Oxidation of contacts or connectors.

How do I fix a B1D31 diagnostic trouble code?

To fix B1D31: Check the integrity of the wiring harness to the mirror. Check the voltage at the motor connector when trying to adjust. Check motor resistance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1D31?

Limited driving only, diagnose soon

How much does it cost to fix B1D31?

The estimated repair cost for B1D31 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat