B1349 – OBD-II DTC

OBD-II DTC B1349 – Heated Backlite Relay Short To Battery

DTC B1349 meaning

DTC B1349 refers to a diagnostic trouble code indicating a “Heated Backlite Relay Short To Battery.” This code is generated when the vehicle’s onboard diagnostic system detects a short circuit in the heated backlite relay circuit, which is responsible for controlling the rear window defroster or heated backlite function.

DTC B1349 symptoms

Common symptoms associated with DTC B1349 may include:

• Rear window defroster not functioning
• Heated backlite not operating
• Dashboard warning lights illuminated
• Possible blown fuses related to the heating system

DTC B1349 causes

Several factors can lead to the occurrence of DTC B1349, including:

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

DTC B1349 seriousness

DTC B1349 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-functioning rear defroster. Ignoring this code may result in further electrical issues or damage to the heating system.

How to diagnose DTC B1349

To diagnose DTC B1349, 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 relay for any visible damage or corrosion.
3. Test the heated backlite relay for proper operation using a multimeter.
4. Check for any blown fuses in the circuit.
5. Examine the body control module for faults or issues.

How to fix DTC B1349 step-by-step instructions

To fix DTC B1349, follow these steps:

1. Repair or replace any damaged wiring or connectors found during the diagnosis.
2. Replace the faulty heated backlite relay if it fails the testing.
3. Replace any blown fuses related to the heating system.
4. Clear the DTC using an OBD-II scanner and test the system to ensure proper operation.
5. Monitor the system for any reoccurrence of the code.

How to erase DTC B1349

To erase DTC B1349, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the 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 return.

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