B1373 – OBD-II DTC

OBD-II DTC B1373 – Illuminated Entry Relay Short To Battery

DTC B1373 meaning

DTC B1373 refers to a diagnostic trouble code indicating a problem with the illuminated entry relay, specifically a short circuit to battery voltage. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components and systems for faults. The illuminated entry relay is responsible for controlling the interior lights and other features that activate when the vehicle is unlocked or opened.

DTC B1373 symptoms

Common symptoms associated with DTC B1373 may include:

• Interior lights remaining on or not functioning properly
• Door locks not responding to remote or manual operation
• Battery drain due to lights staying on
• Malfunctioning keyless entry system

DTC B1373 causes

Several factors can lead to the triggering of DTC B1373, including:

• Short circuit in the illuminated entry relay wiring
• Faulty illuminated entry relay
• Corroded or damaged connectors
• Issues with the body control module (BCM)
• Faulty door switches

DTC B1373 seriousness

DTC B1373 can be considered a moderate issue. While it may not immediately affect the drivability of the vehicle, it can lead to battery drain and inconvenience due to malfunctioning interior lights and entry systems. Addressing this code promptly is advisable to prevent further electrical issues or battery failure.

How to diagnose DTC B1373

To diagnose DTC B1373, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1373 code.
2. Inspect the illuminated entry relay and its wiring for visible damage or corrosion.
3. Check the connectors for proper connection and signs of wear.
4. Test the illuminated entry relay using a multimeter to ensure it operates correctly.
5. Examine the body control module and door switches for faults.

How to fix DTC B1373 step-by-step instructions

To fix DTC B1373, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety while working on electrical components.
2. Inspect and repair any damaged wiring or connectors related to the illuminated entry relay.
3. Replace the illuminated entry relay if it is found to be faulty.
4. Test the door switches and replace them if they are malfunctioning.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Perform a test drive to ensure the issue is resolved and the code does not reappear.

How to erase DTC B1373

To erase DTC B1373, 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 option to clear or erase trouble codes on the scanner.
4. Confirm the action to erase the DTC.
5. Disconnect the scanner and start the vehicle to ensure the code does not return.

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