B1734
Mirror Driver Vertical Switch Circuit Open
B1734 is an OBD-II diagnostic trouble code meaning: Mirror Driver Vertical Switch Circuit Open. Common causes: broken wires in the harness, mirror adjustment switch malfunction. Estimated repair cost: $22–111.
Symptoms
- Inability to adjust the mirror in the vertical plane
- The mirror does not respond to switch commands
- Error indication on the instrument panel (if provided)
Causes
- Broken wires in the harness
- Mirror adjustment switch malfunction
- Oxidation or damage to contacts in the connector
- Problems with the mirror control unit
How to Fix
- Check the integrity of the wiring harness from the switch to the mirror
- Inspect connectors for oxidation or damage
- Check the functionality of the mirror adjustment switch
- If necessary, replace the switch or repair damaged wires
Related codes
FAQ
What does the B1734 code mean?
B1734 is an OBD-II diagnostic trouble code that indicates: Mirror Driver Vertical Switch Circuit Open
What causes a B1734 error code?
The most common causes of B1734 include: Broken wires in the harness; Mirror adjustment switch malfunction; Oxidation or damage to contacts in the connector; Problems with the mirror control unit.
How do I fix a B1734 diagnostic trouble code?
To fix B1734: Check the integrity of the wiring harness from the switch to the mirror. Inspect connectors for oxidation or damage. Check the functionality of the mirror adjustment switch. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1734?
Limited driving only, diagnose soon
How much does it cost to fix B1734?
The estimated repair cost for B1734 is $22–111. Actual cost depends on your vehicle, location, and labor rates.
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