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Engine-Codes – Generic – B1737

B1737 Code - Mirror Driver Horizontal Switch Circuit Failure

Quick Answer

The B1737 diagnostic trouble code (DTC) indicates a failure in the horizontal switch circuit of the driver's side mirror. Common causes include Faulty horizontal switch in the driver's side mirror assembly, Damaged or frayed wiring in the mirror control circuit, Corrosion or dirt buildup in the switch contacts. 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
B1737 indicates Mirror Driver Horizontal Switch Circuit Failure.
Common causes
Common causes include Faulty horizontal switch in the driver's side mirror assembly, Damaged or frayed wiring in the mirror control circuit, Corrosion or dirt buildup in the switch contacts.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 23, 2024
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Code B1737 Description

The B1737 diagnostic trouble code (DTC) indicates a failure in the horizontal switch circuit of the driver's side mirror. This code is typically set when the vehicle's onboard diagnostic system detects an issue with the electrical signal sent from the switch that controls the horizontal movement of the driver's side mirror. This switch is crucial for adjusting the mirror's position to ensure optimal visibility for the driver, thus playing a significant role in vehicle safety.

OBDII Code B1737 - Mirror Driver Horizontal Switch Circuit Failure
B1737 Code - Mirror Driver Horizontal Switch Circuit Failure

Common Causes of B1737

  1. Faulty horizontal switch in the driver's side mirror assembly.
  2. Damaged or frayed wiring in the mirror control circuit.
  3. Corrosion or dirt buildup in the switch contacts.
  4. Malfunctioning mirror motor that fails to respond to switch inputs.
  5. Issues with the vehicle's Body Control Module (BCM) that processes the mirror control signals.

Symptoms of B1737

  1. Inability to adjust the driver's side mirror horizontally.
  2. Intermittent or erratic movement of the mirror when using the switch.
  3. Warning lights on the dashboard related to mirror or electrical system malfunctions.
  4. Other electrical components (like power windows or locks) may also exhibit issues.
  5. Physical damage or wear visible on the mirror switch or wiring harness.

How to Fix B1737

  1. Diagnostic Testing: Begin by using an OBD-II scanner to confirm the B1737 code and check for any additional codes that may indicate related issues. This will help in pinpointing the problem.
  2. Visual Inspection: Inspect the mirror switch and wiring for any visible signs of damage, corrosion, or loose connections. Pay special attention to the harness leading to the mirror.
  3. Switch Replacement: If the switch is found to be faulty, replace it with a new one. Ensure that the new switch is compatible with the vehicle's make and model.
  4. Wiring Repair: If damaged wiring is identified, repair or replace the affected sections to restore proper electrical connectivity.
  5. Testing: After repairs, clear the DTC and conduct a functional test of the mirror adjustment system to ensure that the issue has been resolved and that the mirror operates correctly.

Cost to Fix B1737

The typical repair costs for addressing a B1737 code can vary widely based on the specific diagnosis and repairs needed. On average, the cost may range from $100 to $400. This estimate includes parts (such as a new mirror switch or wiring harness) and labor. Labor rates at auto repair shops generally range from $80 to $150 per hour, with metropolitan areas or dealerships often charging higher rates. Independent shops may offer more competitive pricing. It's advisable to check local rates for a more precise estimate and to consider that the time required for diagnosis may also vary based on the complexity of the issue and the vehicle's make and model.

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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.

Frequently Asked Questions about B1737 Code

1. What are the common symptoms of OBDII code B1737 (Mirror Driver Horizontal Switch Circuit Failure)?

- Common symptoms include inoperative mirror adjustment controls, inability to adjust the driver's side mirror horizontally, and potential issues with other mirror functions.

2. What are the possible causes of OBDII code B1737?

- The code B1737 may be triggered by a faulty mirror switch, damaged wiring or connectors in the mirror switch circuit, or a malfunction in the mirror control module.

3. How can I diagnose the Mirror Driver Horizontal Switch Circuit Failure?

- To diagnose B1737, you can use an OBDII scanner to read the fault codes, visually inspect the mirror switch and wiring for any visible damage, and perform circuit testing to check for continuity and proper voltage.

4. Can a DIY enthusiast repair OBDII code B1737 at home?

- If you have experience with automotive electrical systems, you may be able to repair B1737 at home by replacing the faulty mirror switch, repairing damaged wiring, or resetting the mirror control module.

5. Is it safe to continue driving with OBDII code B1737 present?

- While B1737 may not directly affect the drivability of the vehicle, it is recommended to address the issue promptly to ensure proper functionality of the driver's side mirror and other related systems.

6. How much does it typically cost to repair OBDII code B1737 at a repair shop?

- The cost of repairing B1737 can vary depending on the underlying cause, but it may range from $100 to $300, including parts and labor.

7. Are there any temporary solutions to address OBDII code B1737?

- In some cases, resetting the mirror control module or disconnecting and reconnecting the mirror switch may temporarily resolve B1737, but it's important to address the root cause for a permanent fix.

8. Can extreme weather conditions contribute to triggering OBDII code B1737?

- Yes, extreme heat or cold can potentially cause electrical components to malfunction, leading to issues like B1737. It's important to keep the vehicle protected from harsh weather conditions.

9. Will OBDII code B1737 cause the vehicle to fail an emissions test?

- B1737 is not directly related to emissions, so it typically will not cause the vehicle to fail an emissions test. However, it's still important to address the issue for overall safety and functionality.

10. How long does it take to repair OBDII code B1737?

- The repair time for B1737 can vary based on the specific cause and complexity of the repair. In general, it may take anywhere from 1 to 3 hours to diagnose and fix the issue.

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