B1435 – Wiper Hi/Low Speed Relay Coil Circuit Open

The ODBII code B1435 indicates that there is an open circuit in the wiper high/low speed relay coil, which means the relay is not receiving the necessary electrical signal to operate the windshield wipers at the specified speeds.

The severity of ODBII code B1435 is moderate.

Common Causes For: B1434 Wiper Hi/Low Speed Relay Coil Circuit Failure

• Faulty wiper relay
• Open circuit in the relay coil wiring
• Corroded or damaged connectors
• Faulty wiper switch
• Blown fuse
• Short circuit in the wiring harness

Common misdiagnosis for B1435 Wiper Hi/Low Speed Relay Coil Circuit Open

• Faulty wiper motor
• Bad wiper switch
• Damaged wiring or connectors
• Malfunctioning body control module (BCM)
• Incorrectly diagnosed relay issues
• Battery or charging system problems
• Grounding issues

Common Troubleshooting Steps

The OBD-II code B1435 indicates a problem with the wiper high/low speed relay coil circuit, specifically that the circuit is open. Here are some common troubleshooting steps to diagnose and potentially resolve this issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information about the wiper relay circuit, including wiring diagrams and component locations.
• Visual Inspection:
• Inspect the wiper relay and its connectors for any signs of damage, corrosion, or loose connections.
• Check the wiring harness for frays, breaks, or shorts that could cause an open circuit.
• Test the Wiper Relay:
• Remove the wiper relay and test it using a multimeter. Check for continuity across the relay terminals when it is energized.
• If the relay is faulty, replace it with a new one.
• Check the Fuse:
• Locate the fuse associated with the wiper system and check if it is blown. If it is, replace it and see if the code returns.
• Inspect the Wiper Switch:
• The wiper switch may also be a source of the problem. Test the switch for proper operation and continuity in all positions (off, low, high).
• If the switch is faulty, it may need to be replaced.
• Check for Ground Issues:
• Ensure that the ground connections for the wiper system are secure and free of corrosion. A poor ground can lead to circuit issues.
• Test the Circuit:
• Use a multimeter to check for voltage at the relay connector when the wiper switch is activated. If there is no voltage, trace the circuit back to find the source of the issue.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any other related trouble codes that may provide additional insight into the problem.
• Inspect the Wiper Motor:
• If all other components check out, the wiper motor itself may be faulty. Test the motor for proper operation and check for any internal issues.
• Clear the Code:
• After performing repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns. If you are not comfortable performing these steps or if the issue persists after troubleshooting, it may be best to consult a professional mechanic for further diagnosis and repair.