AutoCodes – Generic – B1734

B1734 Code - Mirror Driver Vertical Switch Circuit Open

Quick Answer

The Body Control Module (BCM) monitors the Mirror Driver Vertical Switch. Common causes include Faulty Mirror Driver Vertical Switch, Mirror Driver Vertical Switch harness is open or shorted, Mirror Driver Vertical Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1734 indicates Mirror Driver Vertical Switch Circuit Open.
Common causes: Common causes include Faulty Mirror Driver Vertical Switch, Mirror Driver Vertical Switch harness is open or shorted, Mirror Driver Vertical Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,570

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 23, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code B1734 Description

The Body Control Module (BCM) monitors the Mirror Driver Vertical Switch. The BCM sets the OBDII code when the Mirror Driver Vertical Switch is not to factory specifications.

OBDII Code B1734 - Mirror Driver Vertical Switch Circuit Open - AutoCodes.com — B1734 Code - Mirror Driver Vertical Switch Circuit Open

What does this mean?

What are the Possible Causes of the DTC B1734?

Faulty Mirror Driver Vertical Switch
Mirror Driver Vertical Switch harness is open or shorted
Mirror Driver Vertical Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1734?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1734 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.