WOMS
B code body Medium severity

B1434 Wiper Hi/Low Speed Relay Coil Circuit Failure

The OBD2 code B1434 indicates a failure in the wiper high/low speed relay coil circuit, which may affect the operation of the windshield wipers

Definition

The OBD2 code B1434 indicates a failure in the wiper high/low speed relay coil circuit, which may affect the operation of the windshield wipers

Common causes

  • Faulty wiper relay
  • Damaged wiring or connectors
  • Short circuit in the relay circuit
  • Corroded terminals
  • Failed wiper motor
  • Blown fuse
  • Malfunctioning body control module (BCM)

Common misdiagnoses

  • Faulty windshield wiper motor
  • Bad wiper switch
  • Wiring issues or shorts in the harness
  • Faulty body control module (BCM)
  • Blown fuses related to the wiper system
  • Corroded connectors or terminals
  • Incorrectly installed or damaged wiper assembly

Troubleshooting steps

  1. 1. Check the Fuse:

    Locate the fuse box and check the fuse associated with the windshield wiper system. If the fuse is blown, replace it and see if the problem persists

  2. 2. Inspect the Relay:

    Locate the wiper relay in the fuse box or relay panel. Remove the relay and inspect it for any signs of damage or corrosion. If you have a multimeter, you can test the relay for continuity. If the relay is faulty, replace it

  3. 3. Examine Wiring and Connectors:

    Inspect the wiring and connectors leading to the wiper relay and motor. Look for any signs of fraying, corrosion, or loose connections. Repair or replace any damaged wiring or connectors

  4. 4. Test the Wiper Motor:

    If the relay and wiring appear to be in good condition, test the wiper motor itself. You can do this by applying direct power to the motor to see if it operates. If the motor does not work, it may need to be replaced

  5. 5. Check for Ground Issues:

    Ensure that the wiper motor and relay have a good ground connection. A poor ground can cause the circuit to malfunction. Clean any corroded ground connections

  6. 6. Scan for Additional Codes:

    Use an OBD-II scanner to check for any additional trouble codes that may provide more context to the issue. Addressing other related codes may help resolve the B1434 code

  7. 7. Inspect the Wiper Switch:

    The wiper switch on the steering column can also be a source of the problem. Test the switch for proper operation and continuity. If the switch is faulty, it may need to be replaced

  8. 8. Check for Short Circuits:

    Inspect the circuit for any short circuits that may be causing the relay to fail. This can involve checking for pinched wires or damaged insulation

  9. 9. Consult Wiring Diagrams:

    Refer to the vehicle’s wiring diagrams to understand the circuit better and identify any other components that may be involved in the wiper system

  10. 10. Professional Diagnosis:

    If you are unable to resolve the issue after performing these steps, it may be best to consult a professional mechanic or technician who can perform a more in-depth diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1434 code. Always remember to take necessary safety precautions when working on your vehicle's electrical system