AutoCodes – Generic – B1739

B1739 Code - Mirror Driver Horizontal Switch Circuit Short To Battery

Quick Answer

The Body Control Module (BCM) monitors the Mirror Driver Horizontal Switch. Common causes include Faulty Mirror Driver Horizontal Switch, Mirror Driver Horizontal Switch harness is open or shorted, Mirror Driver Horizontal 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: B1739 indicates Mirror Driver Horizontal Switch Circuit Short To Battery.
Common causes: Common causes include Faulty Mirror Driver Horizontal Switch, Mirror Driver Horizontal Switch harness is open or shorted, Mirror Driver Horizontal 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 4,757

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
FAQs
Comments
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Code B1739 Description

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

OBDII Code B1739 - Mirror Driver Horizontal Switch Circuit Short To Battery - AutoCodes.com — B1739 Code - Mirror Driver Horizontal Switch Circuit Short To Battery

What does this mean?

What are the Possible Causes of the DTC B1739?

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

How to Fix the DTC B1739?

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 B1739 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.

Need more information about the B1739 code?

Need more information on how to fix the B1739 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1739 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1739 Hyundai — Pressure-Side Impact Sensor Front Driver Defect
B1739 KIA — Pressure-Side Impact Sensor Front Driver Defect

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.

Frequently Asked Questions about B1739 Code

1. What are the common symptoms of OBDII code B1739 (Mirror Driver Horizontal Switch Circuit Short To Battery)?

Symptoms may include inoperative power mirrors, erratic mirror movement, or a mirror switch that does not respond.

2. What can cause OBDII code B1739 to trigger?

This code is typically triggered by a short circuit in the mirror driver horizontal switch circuit, often caused by damaged wiring or a faulty mirror switch.

3. How can I diagnose the cause of OBDII code B1739?

A thorough visual inspection of the mirror switch wiring and connectors is recommended, along with testing the switch for continuity and checking for any damaged or pinched wires.

4. Can I continue driving with OBDII code B1739 present?

While the vehicle may still be operable with this code, it is important to address the issue promptly to ensure proper functioning of the power mirrors.

5. What are some repair tips for fixing OBDII code B1739?

Repair options may include repairing or replacing damaged wiring, replacing the mirror switch if faulty, and clearing the code with an OBDII scanner.

6. Is OBDII code B1739 a serious issue?

While not a critical issue for the overall operation of the vehicle, addressing this code is important for the proper functioning of the power mirrors.

7. Can a DIY enthusiast fix OBDII code B1739?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair this code themselves by following repair guides and using appropriate resources.

8. How much does it cost to repair OBDII code B1739 at a professional auto repair shop?

Costs can vary depending on the extent of the damage and the rates of the repair shop, but typically, diagnosing and repairing this code may cost a few hundred dollars.

9. Are there any preventive measures to avoid OBDII code B1739 from occurring?

Regularly inspecting the mirror switch wiring for any signs of wear or damage, as well as using the power mirrors properly, can help prevent this code from occurring.

10. Can OBDII code B1739 affect other electrical components in the vehicle?

While this code specifically relates to the mirror driver horizontal switch circuit, electrical issues in one part of the vehicle can sometimes impact other components, so it's best to address the problem promptly.