B1612 – Wiper Rear Mode Select Switch Circuit Open

The ODBII code B1612 indicates that there is an open circuit in the rear wiper mode select switch, which means the switch is not functioning properly or is not making a proper connection.

The severity of ODBII code B1612 is generally considered moderate.

Common Causes For: B1611 Wiper Rear Mode Select Switch Circuit Failure

• Faulty rear wiper mode select switch
• Open circuit or broken wiring
• Poor electrical connections or corroded terminals
• Malfunctioning body control module (BCM)
• Short circuit in the wiring harness
• Faulty rear wiper motor
• Blown fuse related to the rear wiper system

Common misdiagnosis for B1612 Wiper Rear Mode Select Switch Circuit Open

• Faulty rear wiper motor
• Defective wiper control module
• Wiring issues or shorts in the harness
• Malfunctioning front wiper switch
• Issues with the body control module (BCM)
• Incorrectly diagnosed electrical connections or terminals
• Problems with the fuse related to the wiper system

Common Troubleshooting Steps

The OBD-II code B1612 indicates a problem with the rear wiper mode select switch circuit, specifically that there is an open circuit. 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 regarding the rear wiper system and the wiring diagram. This will help you understand the circuit layout and components involved.
• Visual Inspection:
• Inspect the rear wiper switch for any visible damage or wear.
• Check the wiring harness and connectors for signs of corrosion, fraying, or disconnection.
• Look for any loose or damaged wires that could cause an open circuit.
• Test the Rear Wiper Switch:
• Use a multimeter to test the continuity of the rear wiper mode select switch. If the switch is faulty, it may need to be replaced.
• Check for Power and Ground:
• With the ignition on, use a multimeter to check for voltage at the rear wiper switch connector. Ensure that the switch is receiving power.
• Check for a good ground connection at the switch and the wiper motor.
• Inspect the Wiper Motor:
• If the switch and wiring are functioning correctly, test the rear wiper motor. Ensure it is receiving power when the switch is activated.
• If the motor is not functioning, it may need to be replaced.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Check for Short Circuits:
• Inspect the wiring for any short circuits that could affect the rear wiper circuit. This includes checking for damaged insulation or pinched wires.
• Clear the Code:
• After performing repairs or replacements, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult a Professional:
• If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1612 code.