B1743: Mirror Passenger Vertical Switch Circuit Short To Battery

Definition

The OBD2 code B1743 indicates a short circuit in the passenger mirror's vertical switch circuit, causing it to connect directly to the battery voltage

Common causes

Shorted wiring or connectors in the mirror switch circuit
Faulty mirror vertical switch
Damaged or corroded wiring harness
Malfunctioning power mirror motor
Poor ground connection in the circuit

Common misdiagnoses

Faulty passenger side mirror switch
Wiring harness issues
Short circuit in the mirror motor
Faulty body control module (BCM)
Incorrectly installed or damaged mirror assembly
Grounding issues in the electrical system
Faulty connectors or terminals in the circuit

Troubleshooting steps

1. Verify the Code

Use an OBD-II scanner to confirm the presence of the B1743 code. Clear the code and see if it returns after a short drive
2. Inspect the Wiring and Connectors
3. Check the wiring harness and connectors associated with the passenger side mirror switch. Look for any signs of damage, 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 vertical switch for proper operation. You can do this by using a multimeter to check for continuity when the switch is activated
7. If the switch is faulty, it may need to be replaced
8. Inspect the Mirror Assembly
9. Examine the mirror assembly itself for any signs of damage or short circuits. Sometimes, the internal components of the mirror can cause issues
10. Check for Short Circuits
11. Use a multimeter to check for shorts in the wiring. Disconnect the switch and check the resistance between the switch terminals and ground. A low resistance reading may indicate a short to battery
12. Test the Power Supply
13. Ensure that the power supply to the mirror switch is functioning correctly. Check for proper voltage at the switch connector with the ignition on
14. Look for Related Codes
15. Check for any other related trouble codes that may provide additional context or indicate a broader issue with the vehicle's electrical system
16. Inspect Ground Connections
17. Ensure that all ground connections related to the mirror and switch are clean and secure. Poor grounding can lead to erratic behavior
18. Consult Wiring Diagrams
19. Refer to the vehicle’s service manual for wiring diagrams to understand the circuit better and identify any other components that may be involved
20. Perform a Visual Inspection
21. Look for any signs of water intrusion or damage in the area around the mirror and switch, as moisture can cause electrical issues. 1
22. Replace Components as Necessary
23. If you identify any faulty components (switch, wiring, or mirror assembly), replace them as needed. 1
24. Recheck the System
25. After making repairs, clear the codes and take the vehicle for a test drive to see if the code returns. If you are not comfortable performing these steps or if the issue persists after troubleshooting, it may be best to consult a professional mechanic for further diagnosis and repair

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Verify the Code

2. Inspect the Wiring and Connectors

3. Check the wiring harness and connectors associated with the passenger side mirror switch. Look for any signs of damage, 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 vertical switch for proper operation. You can do this by using a multimeter to check for continuity when the switch is activated

7. If the switch is faulty, it may need to be replaced

8. Inspect the Mirror Assembly

9. Examine the mirror assembly itself for any signs of damage or short circuits. Sometimes, the internal components of the mirror can cause issues

10. Check for Short Circuits

11. Use a multimeter to check for shorts in the wiring. Disconnect the switch and check the resistance between the switch terminals and ground. A low resistance reading may indicate a short to battery

12. Test the Power Supply

13. Ensure that the power supply to the mirror switch is functioning correctly. Check for proper voltage at the switch connector with the ignition on

14. Look for Related Codes

15. Check for any other related trouble codes that may provide additional context or indicate a broader issue with the vehicle's electrical system

16. Inspect Ground Connections

17. Ensure that all ground connections related to the mirror and switch are clean and secure. Poor grounding can lead to erratic behavior

18. Consult Wiring Diagrams

19. Refer to the vehicle’s service manual for wiring diagrams to understand the circuit better and identify any other components that may be involved

20. Perform a Visual Inspection

21. Look for any signs of water intrusion or damage in the area around the mirror and switch, as moisture can cause electrical issues. 1

22. Replace Components as Necessary

23. If you identify any faulty components (switch, wiring, or mirror assembly), replace them as needed. 1

24. Recheck the System

25. After making repairs, clear the codes and take the vehicle for a test drive to see if the code returns. If you are not comfortable performing these steps or if the issue persists after troubleshooting, it may be best to consult a professional mechanic for further diagnosis and repair