B1261 – Solar Radiation Sensor Circuit Short To Ground

The ODBII code B1261 indicates a short circuit in the solar radiation sensor circuit, meaning that the circuit is unintentionally connected to ground, which can affect the sensor’s performance and the vehicle’s climate control system.

The severity of ODBII code B1261 is moderate.

Common Causes For: B1260 Solar Radiation Sensor Circuit Short To Battery

• Damaged wiring or connectors
• Faulty solar radiation sensor
• Short circuit in the sensor circuit
• Corroded connections
• Grounding issues in the circuit
• Water intrusion or moisture damage
• Improper installation or alignment of the sensor

Common misdiagnosis for B1261 Solar Radiation Sensor Circuit Short To Ground

• Faulty solar radiation sensor
• Wiring issues or shorts in the harness
• Malfunctioning body control module (BCM)
• Incorrectly diagnosed ambient light sensor issues
• Problems with the HVAC control module
• Issues with the vehicle’s electrical system or grounding points

Common Troubleshooting Steps

When dealing with an OBD-II code B1261, which indicates a “Solar Radiation Sensor Circuit Short to Ground,” it’s important to follow a systematic approach to troubleshoot the issue. Here are common troubleshooting steps you can take:

• Verify the Code:
• Use an OBD-II scanner to confirm the presence of the B1261 code. Clear the code and see if it returns after a short drive.
• Inspect the Wiring and Connectors:
• Check the wiring harness and connectors associated with the solar radiation sensor. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to any areas where the wiring may be pinched, frayed, or exposed to moisture.
• Check the Solar Radiation Sensor:
• Locate the solar radiation sensor, which is typically mounted on the vehicle’s dashboard or windshield.
• Inspect the sensor for physical damage or contamination that could affect its operation.
• Test the Sensor:
• If possible, test the solar radiation sensor using a multimeter. Check for proper resistance and voltage readings according to the manufacturer’s specifications.
• If the sensor is faulty, it may need to be replaced.
• Check for Short Circuits:
• Use a multimeter to check for continuity in the wiring. Look for any shorts to ground in the circuit that could be causing the code.
• Disconnect the sensor and check the wiring harness for continuity to ground. If there is continuity, there may be a short in the wiring.
• Inspect the Ground Connections:
• Ensure that all ground connections related to the solar radiation sensor are clean and secure. A poor ground can cause erroneous readings and trigger codes.
• Check the Vehicle’s Electrical System:
• Inspect the vehicle’s electrical system for any issues that could affect the sensor circuit, such as a weak battery or faulty alternator.
• Consult Wiring Diagrams:
• Refer to the vehicle’s service manual for wiring diagrams and specifications. This can help you understand the circuit layout and identify potential problem areas.
• Perform a Visual Inspection:
• Look for any signs of water intrusion or damage in the area where the sensor is located, as moisture can cause electrical issues.
• Reset the Code:
• After performing repairs or replacements, clear the code with the OBD-II scanner and take the vehicle for a test drive to see if the code returns. 1
• Seek Professional Help:
• If the issue persists after following these steps, consider consulting a professional mechanic or automotive technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1261 code.