B1459: Wiper Washer Pump Motor Relay Coil Circuit Open

Definition

The OBD2 code B1459 indicates that there is an open circuit in the wiper washer pump motor relay coil, meaning the relay is not receiving the necessary electrical signal to operate the washer pump

Common causes

Faulty wiper washer pump motor relay
Open circuit in the relay coil wiring
Corroded or damaged connectors
Blown fuse in the wiper washer circuit
Faulty wiper washer switch
Short circuit in the wiring harness
Ground connection issues

Common misdiagnoses

Faulty wiper washer pump
Bad wiper switch
Damaged wiring or connectors
Faulty body control module (BCM)
Blown fuse
Incorrectly installed or defective relay
Grounding issues

Troubleshooting steps

1. Check the Code

Confirm that the code is indeed B1459 and not a different code. Use an OBD-II scanner to verify
2. Visual Inspection
3. Inspect the wiring and connectors related to the wiper washer pump motor relay. Look for any signs of damage, corrosion, or loose connections
4. Check the relay itself for any physical damage
5. Test the Relay
6. Remove the relay and test it using a multimeter. Check for continuity between the relay terminals when it is energized
7. If the relay is faulty, replace it with a new one
8. Inspect the Fuse
9. Check the fuse associated with the wiper washer pump circuit. If the fuse is blown, replace it and see if the code returns
10. Check Power and Ground
11. Use a multimeter to check for power at the relay socket when the ignition is on. You should see battery voltage at the appropriate terminal
12. Check for a good ground connection at the relay. If there is no ground, trace the wiring back to find the issue
13. Test the Wiper Washer Pump
14. If the relay and wiring are good, test the wiper washer pump itself. Apply direct power to the pump to see if it operates. If it does not, the pump may be faulty and needs replacement
15. Inspect the Control Circuit
16. Check the control circuit that activates the relay. This may involve checking the switch that activates the washer pump and ensuring it is functioning correctly
17. Scan for Additional Codes
18. Check for any other related trouble codes that may provide more context to the issue. Sometimes multiple codes can point to a common problem
19. Clear the Code
20. After performing repairs, clear the code using the OBD-II scanner and take the vehicle for a test drive to see if the code returns
21. Consult a Professional
22. If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the B1459 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the Code

2. Visual Inspection

3. Inspect the wiring and connectors related to the wiper washer pump motor relay. Look for any signs of damage, corrosion, or loose connections

4. Check the relay itself for any physical damage

5. Test the Relay

6. Remove the relay and test it using a multimeter. Check for continuity between the relay terminals when it is energized

7. If the relay is faulty, replace it with a new one

8. Inspect the Fuse

9. Check the fuse associated with the wiper washer pump circuit. If the fuse is blown, replace it and see if the code returns

10. Check Power and Ground

11. Use a multimeter to check for power at the relay socket when the ignition is on. You should see battery voltage at the appropriate terminal

12. Check for a good ground connection at the relay. If there is no ground, trace the wiring back to find the issue

13. Test the Wiper Washer Pump

14. If the relay and wiring are good, test the wiper washer pump itself. Apply direct power to the pump to see if it operates. If it does not, the pump may be faulty and needs replacement

15. Inspect the Control Circuit

16. Check the control circuit that activates the relay. This may involve checking the switch that activates the washer pump and ensuring it is functioning correctly

17. Scan for Additional Codes

18. Check for any other related trouble codes that may provide more context to the issue. Sometimes multiple codes can point to a common problem

19. Clear the Code

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

21. Consult a Professional

22. If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the B1459 code