B1612: Wiper Rear Mode Select Switch Circuit Open

Definition

The OBD2 code B1612 indicates that there is an open circuit in the rear wiper mode select switch, which means the switch is not functioning properly or is not making a proper connection

Common causes

Faulty rear wiper mode select switch
Open circuit or broken wiring
Poor electrical connections or corroded terminals
Malfunctioning body control module (BCM)
Short circuit in the wiring harness
Faulty rear wiper motor
Blown fuse related to the rear wiper system

Common misdiagnoses

Faulty rear wiper motor
Defective wiper control module
Wiring issues or shorts in the harness
Malfunctioning front wiper switch
Issues with the body control module (BCM)
Incorrectly diagnosed electrical connections or terminals
Problems with the fuse related to the wiper system

Troubleshooting steps

1. Check the Vehicle's Manual

Refer to the vehicle's service manual for specific information regarding the rear wiper system and the wiring diagram. This will help you understand the circuit layout and components involved
2. Visual Inspection
3. Inspect the rear wiper switch for any visible damage or wear
4. Check the wiring harness and connectors for signs of corrosion, fraying, or disconnection
5. Look for any loose or damaged wires that could cause an open circuit
6. Test the Rear Wiper Switch
7. Use a multimeter to test the continuity of the rear wiper mode select switch. If the switch is faulty, it may need to be replaced
8. Check for Power and Ground
9. With the ignition on, use a multimeter to check for voltage at the rear wiper switch connector. Ensure that the switch is receiving power
10. Check for a good ground connection at the switch and the wiper motor
11. Inspect the Wiper Motor
12. If the switch and wiring are functioning correctly, test the rear wiper motor. Ensure it is receiving power when the switch is activated
13. If the motor is not functioning, it may need to be replaced
14. Scan for Additional Codes
15. Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues
16. Check for Short Circuits
17. Inspect the wiring for any short circuits that could affect the rear wiper circuit. This includes checking for damaged insulation or pinched wires
18. Clear the Code
19. After performing repairs or replacements, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns
20. Consult a Professional
21. If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1612 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the Vehicle's Manual

2. Visual Inspection

3. Inspect the rear wiper switch for any visible damage or wear

4. Check the wiring harness and connectors for signs of corrosion, fraying, or disconnection

5. Look for any loose or damaged wires that could cause an open circuit

6. Test the Rear Wiper Switch

7. Use a multimeter to test the continuity of the rear wiper mode select switch. If the switch is faulty, it may need to be replaced

8. Check for Power and Ground

9. With the ignition on, use a multimeter to check for voltage at the rear wiper switch connector. Ensure that the switch is receiving power

10. Check for a good ground connection at the switch and the wiper motor

11. Inspect the Wiper Motor

12. If the switch and wiring are functioning correctly, test the rear wiper motor. Ensure it is receiving power when the switch is activated

13. If the motor is not functioning, it may need to be replaced

14. Scan for Additional Codes

15. Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

16. Check for Short Circuits

17. Inspect the wiring for any short circuits that could affect the rear wiper circuit. This includes checking for damaged insulation or pinched wires

18. Clear the Code

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

20. Consult a Professional

21. If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1612 code