B1459 – Wiper Washer Pump Motor Relay Coil Circuit Open

The ODBII 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.

The severity of ODBII code B1459 is moderate.

Common Causes For: B1458 Wiper Washer Pump Motor Relay Circuit Failure

• 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 misdiagnosis for B1459 Wiper Washer Pump Motor Relay Coil Circuit Open

• 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

Common Troubleshooting Steps

When dealing with OBD-II code B1459, which indicates an issue with the Wiper Washer Pump Motor Relay Coil Circuit being open, you can follow these common troubleshooting steps:

• Check the Code: Confirm that the code is indeed B1459 and not a different code. Use an OBD-II scanner to verify.
• Visual Inspection:
• Inspect the wiring and connectors related to the wiper washer pump motor relay. Look for any signs of damage, corrosion, or loose connections.
• Check the relay itself for any physical damage.
• Test the Relay:
• Remove the relay and test it using a multimeter. Check for continuity between the relay terminals when it is energized.
• If the relay is faulty, replace it with a new one.
• Inspect the Fuse:
• Check the fuse associated with the wiper washer pump circuit. If the fuse is blown, replace it and see if the code returns.
• Check Power and Ground:
• 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.
• Check for a good ground connection at the relay. If there is no ground, trace the wiring back to find the issue.
• Test the Wiper Washer Pump:
• 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.
• Inspect the Control Circuit:
• 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.
• Scan for Additional Codes:
• Check for any other related trouble codes that may provide more context to the issue. Sometimes multiple codes can point to a common problem.
• Clear the Code:
• 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.
• Consult a Professional:
• 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.