B1344 – Heated Backlite Input Circuit Open

The ODBII code B1344 indicates that there is an open circuit in the heated backlite input, which means the system is not receiving the expected signal from the heated rear window circuit.

The severity of ODBII code B1344 is generally considered moderate.

Common Causes For: B1343 Heated Backlite Input Circuit Failure

• Open circuit in the wiring
• Faulty heated backlite switch
• Defective heated backlite element
• Poor ground connection
• Damaged connectors or terminals
• Blown fuse in the heated backlite circuit

Common misdiagnosis for B1344 Heated Backlite Input Circuit Open

• Faulty rear defroster switch
• Damaged wiring or connectors
• Malfunctioning body control module (BCM)
• Defective rear defroster grid
• Incorrectly diagnosed as a battery issue
• Misinterpretation as a general electrical fault
• Faulty relay or fuse related to the rear defroster
• Issues with the vehicle’s ground connections

Common Troubleshooting Steps

The OBD-II code B1344 indicates a problem with the heated backlite input circuit, specifically that it is open. This code is often associated with issues in the wiring or components related to the heated rear window or backlite. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information about the heated backlite system and wiring diagrams.
• Visual Inspection:
• Inspect the wiring harness and connectors related to the heated backlite for any signs of damage, corrosion, or loose connections.
• Look for frayed wires, broken connectors, or any signs of wear that could cause an open circuit.
• Test the Heated Backlite:
• If possible, test the heated backlite element itself to ensure it is functioning properly. You can do this by applying power directly to the element and checking for heat.
• If the element does not heat up, it may be faulty and need replacement.
• Check Fuses:
• Locate and check the fuse associated with the heated backlite circuit. If the fuse is blown, replace it and see if the code returns.
• Inspect the Relay:
• If the system uses a relay, check the relay for proper operation. You can test the relay by swapping it with a similar one in the fuse box or using a multimeter.
• Use a Multimeter:
• With the ignition on, use a multimeter to check for voltage at the heated backlite connector. If there is no voltage, trace the wiring back to the source to find where the open circuit occurs.
• Check for continuity in the wiring between the heated backlite and the control module.
• Check the Control Module:
• If all wiring and components appear to be in good condition, the issue may lie within the control module that manages the heated backlite. Check for any fault codes in the module and consider reprogramming or replacing it if necessary.
• Clear the Code:
• After performing repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult a Professional:
• If you are unable to diagnose or fix the issue, 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 resolve the issue related to the B1344 code.