OBD Guide
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B1738

Mirror Driver Horizontal Switch Circuit Open

B1738 is an OBD-II diagnostic trouble code meaning: Mirror Driver Horizontal Switch Circuit Open. Common causes: broken or damaged wiring harness, oxidation or corrosion of contacts. Estimated repair cost: $22–89.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–89 (est.)

Symptoms

  • The driver's mirror is not horizontally adjustable
  • Mirror adjustment switch (horizontal position) does not work
  • Possible problems with mirror position memory (if any)

Causes

  • Broken or damaged wiring harness
  • Oxidation or corrosion of contacts
  • Mirror switch malfunction
  • Problems with the mirror control module

How to Fix

  1. Check the integrity of the wiring harness in the driver's door
  2. Inspect switch contacts and connectors
  3. Test the mirror switch
  4. If necessary, replace the switch or repair the harness
  5. Check the operation of the mirror control module

Related codes

B1737B1739B1740

FAQ

What does the B1738 code mean?

B1738 is an OBD-II diagnostic trouble code that indicates: Mirror Driver Horizontal Switch Circuit Open

What causes a B1738 error code?

The most common causes of B1738 include: Broken or damaged wiring harness; Oxidation or corrosion of contacts; Mirror switch malfunction; Problems with the mirror control module.

How do I fix a B1738 diagnostic trouble code?

To fix B1738: Check the integrity of the wiring harness in the driver's door. Inspect switch contacts and connectors. Test the mirror switch. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1738?

Yes, but get it checked soon

How much does it cost to fix B1738?

The estimated repair cost for B1738 is $22–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat