B1825: Wiper Rear Park Sense Input Circuit Short To Ground

Definition

The OBD2 code B1825 indicates a short circuit to ground in the rear wiper park sense input circuit, which affects the proper functioning of the rear wiper system

Common causes

Damaged wiring or connectors
Shorted wires in the circuit
Faulty rear wiper motor
Malfunctioning rear wiper switch
Corroded or loose connections
Water intrusion in electrical components
Faulty body control module (BCM)

Common misdiagnoses

Faulty rear wiper motor
Damaged wiring or connectors
Malfunctioning body control module (BCM)
Incorrectly installed or defective rear wiper switch
Shorted or damaged ground connections
Issues with the rear wiper relay
Faulty or corroded terminals in the circuit

Troubleshooting steps

1. Visual Inspection
2. Check the wiring and connectors associated with the rear wiper system. Look for any signs of damage, fraying, or corrosion
3. Inspect the rear wiper motor and its connections for any physical damage
4. Check for Shorts
5. Use a multimeter to check for continuity in the rear wiper park sense input circuit. Disconnect the connector from the rear wiper motor and check for continuity between the circuit and ground. If there is continuity, there is likely a short to ground
6. Test the Rear Wiper Motor
7. With the connector still disconnected, test the rear wiper motor for proper operation. Apply power directly to the motor to see if it functions correctly. If it does not work, the motor may be faulty and needs replacement
8. Inspect the Ground Connections
9. Ensure that all ground connections related to the rear wiper system are clean and secure. A poor ground can cause erratic behavior and trigger fault codes
10. Check the Wiper Switch
11. Test the rear wiper switch for proper operation. A malfunctioning switch can send incorrect signals to the wiper motor and cause issues
12. Scan for Additional Codes
13. Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues
14. Repair or Replace Faulty Components
15. If any damaged wiring, connectors, or components are found during the inspection, repair or replace them as necessary
16. Clear the Codes
17. After making repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns
18. If the issue persists, consult the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the rear wiper system
19. Seek Professional Help
20. If you are unable to resolve the issue, consider seeking assistance from a qualified mechanic or automotive technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1825 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Visual Inspection

2. Check the wiring and connectors associated with the rear wiper system. Look for any signs of damage, fraying, or corrosion

3. Inspect the rear wiper motor and its connections for any physical damage

4. Check for Shorts

5. Use a multimeter to check for continuity in the rear wiper park sense input circuit. Disconnect the connector from the rear wiper motor and check for continuity between the circuit and ground. If there is continuity, there is likely a short to ground

6. Test the Rear Wiper Motor

7. With the connector still disconnected, test the rear wiper motor for proper operation. Apply power directly to the motor to see if it functions correctly. If it does not work, the motor may be faulty and needs replacement

8. Inspect the Ground Connections

9. Ensure that all ground connections related to the rear wiper system are clean and secure. A poor ground can cause erratic behavior and trigger fault codes

10. Check the Wiper Switch

11. Test the rear wiper switch for proper operation. A malfunctioning switch can send incorrect signals to the wiper motor and cause issues

12. Scan for Additional Codes

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

14. Repair or Replace Faulty Components

15. If any damaged wiring, connectors, or components are found during the inspection, repair or replace them as necessary

16. Clear the Codes

17. After making repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

18. If the issue persists, consult the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the rear wiper system

19. Seek Professional Help

20. If you are unable to resolve the issue, consider seeking assistance from a qualified mechanic or automotive technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1825 code