B1741: Mirror Passenger Vertical Switch Circuit Failure

Definition

The OBD2 code B1741 indicates a malfunction in the passenger side mirror's vertical switch circuit, which may affect the adjustment of the mirror's position

Common causes

Faulty passenger mirror vertical switch
Damaged wiring or connectors in the switch circuit
Short circuit in the wiring harness
Corroded or poor electrical connections
Malfunctioning power mirror motor
Blown fuse related to the mirror system
Issues with the body control module (BCM)

Common misdiagnoses

Faulty passenger side mirror motor
Wiring issues or shorts in the mirror circuit
Defective mirror switch assembly
Body control module (BCM) malfunction
Incorrectly diagnosed window switch issues
General electrical system problems
Faulty connectors or terminals related to the mirror system

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 fraying, corrosion, or disconnection
4. Check the Switch
5. Remove the switch from the door panel and inspect it for any signs of damage or wear
6. Use a multimeter to test the switch for continuity. If the switch is faulty, it may need to be replaced
7. Test the Mirror Motor
8. If the switch is functioning correctly, check the mirror motor. You can do this by applying direct power to the motor to see if it operates
9. If the motor does not work when powered directly, it may need to be replaced
10. Inspect the Wiring
11. Follow the wiring from the switch to the mirror motor. Look for any breaks, shorts, or corrosion in the connectors
12. Use a multimeter to check for continuity in the wiring. If there is a break, repair or replace the damaged section
13. Check for Ground Issues
14. Ensure that the ground connection for the mirror and switch is secure and free of corrosion. A poor ground can cause circuit failures
15. Scan for Additional Codes
16. Use an OBD-II scanner to check for any other related trouble codes that may provide more context to the issue
17. Clear Codes and Test
18. After performing repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code reappears
19. Consult Wiring Diagrams
20. If the issue persists, consult the vehicle’s wiring diagrams to trace the circuit and identify any other potential issues
21. Professional Help
22. If you are unable to resolve the issue after these steps, consider seeking help from a professional mechanic or an automotive electrician. By following these steps, you should be able to identify and address the cause of the B1741 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 fraying, corrosion, or disconnection

4. Check the Switch

5. Remove the switch from the door panel and inspect it for any signs of damage or wear

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

7. Test the Mirror Motor

8. If the switch is functioning correctly, check the mirror motor. You can do this by applying direct power to the motor to see if it operates

9. If the motor does not work when powered directly, it may need to be replaced

10. Inspect the Wiring

11. Follow the wiring from the switch to the mirror motor. Look for any breaks, shorts, or corrosion in the connectors

12. Use a multimeter to check for continuity in the wiring. If there is a break, repair or replace the damaged section

13. Check for Ground Issues

14. Ensure that the ground connection for the mirror and switch is secure and free of corrosion. A poor ground can cause circuit failures

15. Scan for Additional Codes

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

17. Clear Codes and Test

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

19. Consult Wiring Diagrams

20. If the issue persists, consult the vehicle’s wiring diagrams to trace the circuit and identify any other potential issues

21. Professional Help

22. If you are unable to resolve the issue after these steps, consider seeking help from a professional mechanic or an automotive electrician. By following these steps, you should be able to identify and address the cause of the B1741 code