AutoCodes – Generic – B1738

B1738 Code - Mirror Driver Horizontal Switch Circuit Open

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: B1738 indicates Mirror Driver Horizontal Switch Circuit Open.
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 4,384

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 B1738 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 B1738 - Mirror Driver Horizontal Switch Circuit Open - AutoCodes.com — B1738 Code - Mirror Driver Horizontal Switch Circuit Open

What does this mean?

What are the Possible Causes of the DTC B1738?

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 B1738?

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 B1738 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 B1738 code?

Need more information on how to fix the B1738 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1738 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1738 Hyundai — Pressure-Side Impact Sensor Front Driver Wrong ID
B1738 KIA — Pressure-Side Impact Sensor Front Driver Wrong ID

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 B1738 Code

1. What are the common symptoms of OBDII code B1738 - Mirror Driver Horizontal Switch Circuit Open?

- Common symptoms include the inability to adjust the driver-side mirror horizontally and a malfunctioning mirror switch.

2. What causes the OBDII code B1738 to trigger?

- The code is triggered when there is an open circuit in the mirror driver horizontal switch, often caused by damaged wiring or a faulty switch.

3. How can I diagnose the OBDII code B1738 on my vehicle?

- You can diagnose the code by checking the wiring harness and connections for any damage or corrosion, and testing the mirror switch for continuity.

4. Can a blown fuse cause the OBDII code B1738 to appear?

- Yes, a blown fuse in the mirror circuit can cause an open circuit condition and trigger the B1738 code.

5. Is it safe to continue driving with the OBDII code B1738 present?

- It is generally safe to drive with this code, but you may experience inconvenience due to the inability to adjust the driver-side mirror.

6. How can I repair the OBDII code B1738 at home?

- You can attempt to repair the code at home by checking and repairing any damaged wiring, replacing the mirror switch if necessary, and resetting the fault codes.

7. Are there any common mistakes to avoid when diagnosing the OBDII code B1738?

- One common mistake is overlooking blown fuses in the mirror circuit, which can easily be replaced to resolve the issue.

8. Can extreme weather conditions impact the mirror driver horizontal switch circuit and trigger the B1738 code?

- Yes, extreme weather conditions can lead to moisture or corrosion in the wiring, affecting the mirror switch circuit and triggering the code.

9. Will disconnecting the battery reset the OBDII code B1738?

- Disconnecting the battery may temporarily clear the code, but it is important to diagnose and rectify the underlying issue to prevent the code from reoccurring.

10. Is it recommended to seek professional help for resolving the OBDII code B1738?

- If you are unsure about diagnosing or repairing the code yourself, it is recommended to seek professional help from a qualified mechanic or technician to ensure a proper fix.