B1479 – Wiper Washer Fluid Level Sensor Circuit Failure

The ODBII code B1479 indicates a malfunction in the wiper washer fluid level sensor circuit, suggesting that the sensor is not functioning properly or there is a wiring issue.

The severity of ODBII code B1479 is generally considered low.

Common Causes For: B1478 Power Window One Touch Up/Down Activated Simultaneously

• Faulty wiper washer fluid level sensor
• Damaged wiring or connectors
• Short circuit in the circuit
• Open circuit in the circuit
• Corrosion at the sensor or connector
• Low washer fluid level
• Faulty body control module (BCM)

Common misdiagnosis for B1479 Wiper Washer Fluid Level Sensor Circuit Failure

• Faulty wiper washer fluid level sensor
• Wiring issues or shorts in the circuit
• Faulty body control module (BCM)
• Incorrect fluid level readings due to contamination
• Malfunctioning wiper control switch
• Issues with the vehicle’s electrical system or grounding
• Software glitches in the vehicle’s computer system

Common Troubleshooting Steps

When dealing with OBD-II code B1479, which indicates a “Wiper Washer Fluid Level Sensor Circuit Failure,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information regarding the washer fluid level sensor and its circuit.
• Visual Inspection: **Wiring and Connectors: Inspect the wiring harness and connectors associated with the washer fluid level sensor for any signs of damage, corrosion, or loose connections.
• **Sensor Condition: Check the physical condition of the washer fluid level sensor. Look for cracks, breaks, or any signs of wear.
• Test the Washer Fluid Level Sensor: **Resistance Check: Use a multimeter to measure the resistance of the washer fluid level sensor. Compare the readings to the specifications in the service manual.
• **Functionality Test: If possible, manually trigger the sensor (by simulating a full or empty tank) to see if the vehicle’s system responds accordingly.
• Inspect the Washer Fluid Reservoir: Ensure that the washer fluid reservoir is not clogged or damaged. A blockage can prevent the sensor from functioning properly.
• Check for Short Circuits or Open Circuits: Use a multimeter to check for continuity in the wiring leading to the sensor. Look for any shorts to ground or open circuits that could cause the sensor to fail.
• Scan for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes that may provide additional context or indicate a broader issue.
• Clear the Code: After performing the checks and repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Replace the Sensor (if necessary): If the sensor is found to be faulty after testing, replace it with a new one. Ensure that the replacement part is compatible with your vehicle.
• Check the Body Control Module (BCM): If all else fails, the issue may lie within the BCM or the software that controls the washer fluid level sensor. Consult a professional for further diagnosis.
• Consult a Professional: If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these steps, you should be able to identify and address the cause of the B1479 code effectively.