B2347: Mirror Switch Reference Voltage Positive Common Supply Low Voltage

Definition

The OBD2 code B2347 indicates that the mirror switch reference voltage for the positive common supply is lower than expected, which may affect the operation of the mirror adjustment features

Common causes

Faulty mirror switch
Damaged wiring or connectors
Short circuit in the wiring harness
Grounding issues
Low battery voltage
Faulty body control module (BCM)
Corroded terminals or connectors
Open circuit in the power supply line

Common misdiagnoses

Faulty mirror switch
Wiring harness issues
Grounding problems
Body control module failure
Short circuit in the circuit
Open circuit in the circuit
Faulty power supply to the module
Incorrectly installed or damaged connectors

Troubleshooting steps

1. Check the Vehicle's Battery Voltage
2. Ensure that the vehicle's battery is fully charged and in good condition. A low battery voltage can affect the operation of electrical components
3. Inspect Fuses
4. Check the fuses related to the power mirrors and the mirror switch. A blown fuse can cause a loss of power to the mirror switch
5. Examine Wiring and Connectors
6. Inspect the wiring harness and connectors associated with the mirror switch and power mirrors for any signs of damage, corrosion, or loose connections. Pay special attention to the ground connections
7. Test the Mirror Switch
8. Use a multimeter to test the mirror switch for proper operation. Check for continuity and ensure that the switch is functioning correctly
9. Check for Short Circuits
10. Look for any short circuits in the wiring that could be causing a drop in voltage. This may involve visually inspecting the wiring and using a multimeter to check for continuity between wires that should not be connected
11. Measure Voltage at the Mirror Switch
12. With the ignition on, measure the voltage at the mirror switch connector. Compare the readings to the specifications in the vehicle's service manual. If the voltage is low, trace the wiring back to the source
13. Inspect Ground Connections
14. Ensure that the ground connections for the mirror switch and related components are clean and secure. A poor ground can lead to low voltage issues
15. Check for Module Issues
16. If the vehicle is equipped with a body control module (BCM) or similar control module, check for any fault codes related to the module. The module may be malfunctioning and affecting the mirror switch operation
17. Consult Wiring Diagrams
18. Refer to the vehicle's wiring diagrams to understand the circuit layout and identify any potential issues in the wiring or connections
19. Clear Codes and Test Drive
20. After performing repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code reappears. If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis and repair

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the Vehicle's Battery Voltage

2. Ensure that the vehicle's battery is fully charged and in good condition. A low battery voltage can affect the operation of electrical components

3. Inspect Fuses

4. Check the fuses related to the power mirrors and the mirror switch. A blown fuse can cause a loss of power to the mirror switch

5. Examine Wiring and Connectors

6. Inspect the wiring harness and connectors associated with the mirror switch and power mirrors for any signs of damage, corrosion, or loose connections. Pay special attention to the ground connections

7. Test the Mirror Switch

8. Use a multimeter to test the mirror switch for proper operation. Check for continuity and ensure that the switch is functioning correctly

9. Check for Short Circuits

10. Look for any short circuits in the wiring that could be causing a drop in voltage. This may involve visually inspecting the wiring and using a multimeter to check for continuity between wires that should not be connected

11. Measure Voltage at the Mirror Switch

12. With the ignition on, measure the voltage at the mirror switch connector. Compare the readings to the specifications in the vehicle's service manual. If the voltage is low, trace the wiring back to the source

13. Inspect Ground Connections

14. Ensure that the ground connections for the mirror switch and related components are clean and secure. A poor ground can lead to low voltage issues

15. Check for Module Issues

16. If the vehicle is equipped with a body control module (BCM) or similar control module, check for any fault codes related to the module. The module may be malfunctioning and affecting the mirror switch operation

17. Consult Wiring Diagrams

18. Refer to the vehicle's wiring diagrams to understand the circuit layout and identify any potential issues in the wiring or connections

19. Clear Codes and Test Drive

20. After performing repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code reappears. If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis and repair