B1345 – OBD-II DTC

OBD-II DTC B1345 – Heated Backlite Input Circuit Short To Ground

DTC B1345 meaning

DTC B1345 refers to a diagnostic trouble code indicating a problem with the Heated Backlite Input Circuit. Specifically, it suggests that there is a short circuit to ground in the input circuit responsible for the heated backlite, which is typically part of the rear defrost system in vehicles. This code is generated when the vehicle’s onboard diagnostic system detects an abnormal voltage level in the circuit.

DTC B1345 symptoms

Common symptoms associated with DTC B1345 may include:

• Heated backlite or rear defrost not functioning
• Dashboard warning lights illuminated
• Intermittent electrical issues in related systems

DTC B1345 causes

Several factors can lead to the triggering of DTC B1345, including:

• Short circuit in the wiring harness
• Faulty heated backlite switch
• Defective rear defrost relay
• Corroded or damaged connectors
• Issues with the body control module (BCM)

DTC B1345 seriousness

DTC B1345 is considered a moderate issue. While it may not affect the vehicle’s drivability, it can lead to reduced visibility in cold weather due to a non-functional rear defrost system. Addressing this code promptly is advisable to ensure safety and comfort while driving.

How to diagnose DTC B1345

To diagnose DTC B1345, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the code.
2. Inspect the wiring and connectors related to the heated backlite for any visible damage or corrosion.
3. Test the heated backlite switch for proper operation.
4. Check the rear defrost relay for functionality.
5. Measure the voltage in the circuit to identify any shorts to ground.

How to fix DTC B1345 step-by-step instructions

To fix DTC B1345, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety.
2. Inspect and repair any damaged wiring or connectors found during diagnosis.
3. Replace the heated backlite switch if it is found to be faulty.
4. Test and replace the rear defrost relay if necessary.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test the heated backlite system to ensure proper operation.

How to erase DTC B1345

To erase DTC B1345, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the vehicle’s ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the vehicle to verify that the code does not reappear.

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