B1737 – Mirror Driver Horizontal Switch Circuit Failure

The ODBII code B1737 indicates a malfunction in the horizontal switch circuit of the mirror driver, which may affect the operation of the side mirror adjustments.

The severity of ODBII code B1737 is generally considered moderate.

Common Causes For: B1736 Mirror Driver Vertical Switch Circuit Short To Ground

• Faulty mirror switch
• Damaged wiring or connectors
• Short circuit in the circuit
• Open circuit in the circuit
• Defective mirror motor
• Corroded terminals
• Poor ground connection
• Malfunctioning body control module (BCM)

Common misdiagnosis for B1737 Mirror Driver Horizontal Switch Circuit Failure

• Faulty mirror switch
• Wiring issues or shorts
• Defective mirror motor
• Body control module (BCM) failure
• Incorrectly programmed BCM
• Faulty door control module
• Poor ground connections
• Malfunctioning power window switch

Common Troubleshooting Steps

The OBD-II code B1737 refers to a “Mirror Driver Horizontal Switch Circuit Failure.” This code typically indicates an issue with the horizontal control of the side mirror, which can be caused by a variety of factors. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues.
• Inspect the Wiring and Connectors:
• Visually inspect the wiring harness and connectors associated with the mirror control switch and the mirror itself. Look for signs of damage, corrosion, or loose connections.
• Ensure that all connectors are securely attached and free of dirt or moisture.
• Test the Mirror Control Switch:
• Use a multimeter to test the mirror control switch for continuity. If the switch is faulty, it may need to be replaced.
• Check for proper operation of the switch by manually activating it and observing if the mirror responds accordingly.
• Check the Mirror Motor:
• If the switch is functioning correctly, the issue may lie with the mirror motor itself. Test the motor for proper operation by applying direct power to it (if safe to do so) to see if it moves.
• If the motor does not respond, it may need to be replaced.
• Inspect the Body Control Module (BCM):
• The BCM controls various electrical functions in the vehicle, including the mirrors. Check for any faults or issues with the BCM that could be affecting the mirror operation.
• If necessary, reprogram or replace the BCM according to manufacturer specifications.
• Check for Ground Issues:
• Ensure that the ground connections for the mirror and the control switch are secure and free of corrosion. A poor ground can lead to erratic behavior or failure of the circuit.
• Look for Short Circuits:
• Inspect the wiring for any signs of short circuits or pinched wires that could be causing the issue. Use a multimeter to check for continuity and resistance in the circuit.
• Consult Wiring Diagrams:
• Refer to the vehicle’s wiring diagrams to understand the circuit layout and identify any other components that may be involved in the mirror control system.
• Perform a System Reset:
• In some cases, clearing the code and resetting the system may resolve the issue if it was a temporary glitch. However, if the problem persists, further investigation is necessary.
• Seek Professional Help:
• If you are unable to diagnose or fix the issue after these steps, it may be best to consult a professional mechanic or an automotive electrician who has experience with electrical systems. By following these troubleshooting steps, you should be able to identify the cause of the B1737 code and take appropriate action to resolve the issue.