B1745: Mirror Passenger Horizontal Switch Circuit Failure

Definition

The OBD2 code B1745 indicates a malfunction in the passenger side mirror's horizontal switch circuit, which may affect the adjustment of the mirror's position

Common causes

Faulty passenger side mirror switch
Damaged wiring or connectors in the mirror switch circuit
Short circuit in the mirror switch circuit
Open circuit in the mirror switch circuit
Faulty passenger side mirror motor
Corrosion or poor connections in the circuit
Malfunctioning body control module (BCM)

Common misdiagnoses

Faulty passenger side mirror motor
Wiring issues or shorts in the mirror circuit
Defective mirror switch
Problems with the body control module (BCM)
Incorrectly diagnosed window switch issues
General electrical system faults
Issues with the vehicle's main wiring harness

Troubleshooting steps

1. Visual Inspection
2. Check the passenger side mirror for any visible damage
3. Inspect the wiring harness connected to the mirror and the switch for any signs of wear, fraying, or corrosion
4. Ensure that all connectors are securely attached and free of dirt or moisture
5. Check the Switch
6. Test the passenger mirror horizontal switch for continuity using a multimeter. If the switch is faulty, it may need to be replaced
7. If possible, swap the switch with a known good one to see if the problem persists
8. Inspect the Mirror Motor
9. Test the mirror motor by applying direct power to it to see if it operates correctly. If the motor does not respond, it may need to be replaced
10. Check for any obstructions that may prevent the mirror from moving
11. Check for Short Circuits
12. Use a multimeter to check for short circuits in the wiring. Look for any wires that may be touching each other or grounding out
13. Scan for Additional Codes
14. Use an OBD-II scanner to check for any other related trouble codes that may provide more context to the issue
15. Inspect the Body Control Module (BCM)
16. The BCM controls various electrical functions in the vehicle, including the mirrors. Check for any faults in the BCM that may be affecting the mirror operation
17. Clear the Code
18. After performing the above checks and repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns
19. Consult Wiring Diagrams
20. Refer to the vehicle’s service manual for wiring diagrams to trace the circuit and identify any potential issues
21. Professional Diagnosis
22. If the issue persists after performing these steps, consider seeking help from a professional mechanic or an automotive electrician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1745 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Visual Inspection

2. Check the passenger side mirror for any visible damage

3. Inspect the wiring harness connected to the mirror and the switch for any signs of wear, fraying, or corrosion

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

5. Check the Switch

6. Test the passenger mirror horizontal switch for continuity using a multimeter. If the switch is faulty, it may need to be replaced

7. If possible, swap the switch with a known good one to see if the problem persists

8. Inspect the Mirror Motor

9. Test the mirror motor by applying direct power to it to see if it operates correctly. If the motor does not respond, it may need to be replaced

10. Check for any obstructions that may prevent the mirror from moving

11. Check for Short Circuits

12. Use a multimeter to check for short circuits in the wiring. Look for any wires that may be touching each other or grounding out

13. Scan for Additional Codes

14. Use an OBD-II scanner to check for any other related trouble codes that may provide more context to the issue

15. Inspect the Body Control Module (BCM)

16. The BCM controls various electrical functions in the vehicle, including the mirrors. Check for any faults in the BCM that may be affecting the mirror operation

17. Clear the Code

18. After performing the above checks and repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

19. Consult Wiring Diagrams

20. Refer to the vehicle’s service manual for wiring diagrams to trace the circuit and identify any potential issues

21. Professional Diagnosis

22. If the issue persists after performing these steps, consider seeking help from a professional mechanic or an automotive electrician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1745 code