B1737: Mirror Driver Horizontal Switch Circuit Failure

Definition

The OBD2 code B1737 indicates a malfunction in the horizontal switch circuit of the mirror driver, which may affect the operation of the side mirror adjustments

Common causes

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 misdiagnoses

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

Troubleshooting steps

1. 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
2. Inspect the Wiring and Connectors
3. 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
4. Ensure that all connectors are securely attached and free of dirt or moisture
5. Test the Mirror Control Switch
6. Use a multimeter to test the mirror control switch for continuity. If the switch is faulty, it may need to be replaced
7. Check for proper operation of the switch by manually activating it and observing if the mirror responds accordingly
8. Check the Mirror Motor
9. 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
10. If the motor does not respond, it may need to be replaced
11. Inspect the Body Control Module (BCM)
12. 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
13. If necessary, reprogram or replace the BCM according to manufacturer specifications
14. Check for Ground Issues
15. 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
16. Look for Short Circuits
17. 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
18. Consult Wiring Diagrams
19. 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
20. Perform a System Reset
21. 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
22. Seek Professional Help
23. 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

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check for Additional Codes

2. Inspect the Wiring and Connectors

3. 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

4. Ensure that all connectors are securely attached and free of dirt or moisture

5. Test the Mirror Control Switch

6. Use a multimeter to test the mirror control switch for continuity. If the switch is faulty, it may need to be replaced

7. Check for proper operation of the switch by manually activating it and observing if the mirror responds accordingly

8. Check the Mirror Motor

9. 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

10. If the motor does not respond, it may need to be replaced

11. Inspect the Body Control Module (BCM)

12. 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

13. If necessary, reprogram or replace the BCM according to manufacturer specifications

14. Check for Ground Issues

15. 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

16. Look for Short Circuits

17. 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

18. Consult Wiring Diagrams

19. 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

20. Perform a System Reset

21. 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

22. Seek Professional Help