B1315 – OBD-II DTC

OBD-II DTC B1315 – Battery Saver Relay Coil Circuit Short To Battery

DTC B1315 meaning

DTC B1315 refers to a diagnostic trouble code indicating a short circuit in the Battery Saver Relay Coil Circuit. This code is triggered when the vehicle’s onboard diagnostic system detects that the relay coil circuit is shorted to the battery voltage, which can lead to improper operation of the battery saver relay. The battery saver relay is responsible for controlling the power supply to various electrical components when the vehicle is turned off, helping to prevent battery drain.

DTC B1315 symptoms

Common symptoms associated with DTC B1315 may include:

• Battery drain or dead battery issues
• Electrical components not functioning properly
• Warning lights illuminated on the dashboard
• Inconsistent operation of the battery saver relay

DTC B1315 causes

Several factors can lead to the triggering of DTC B1315, including:

• Short circuit in the battery saver relay coil circuit
• Faulty battery saver relay
• Damaged wiring or connectors in the circuit
• Corrosion or poor connections at the relay or battery terminals
• Issues with the vehicle’s body control module (BCM)

DTC B1315 seriousness

DTC B1315 can be considered serious as it may lead to battery drain, which can leave the vehicle inoperable. If the battery saver relay is not functioning correctly, it can cause electrical components to remain powered when they should not be, leading to further electrical issues and potential damage to the vehicle’s electrical system.

How to diagnose DTC B1315

To diagnose DTC B1315, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC B1315.
2. Inspect the battery saver relay and its wiring for visible damage or corrosion.
3. Check the relay operation by testing it with a multimeter.
4. Examine the circuit for any shorts to battery voltage using a wiring diagram.
5. Test the body control module for proper function and communication.

How to fix DTC B1315 step-by-step instructions

To fix DTC B1315, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety while working on the electrical system.
2. Inspect and repair any damaged wiring or connectors in the battery saver relay coil circuit.
3. Replace the battery saver relay if it is found to be faulty.
4. Clean any corrosion from battery terminals and connectors.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test the system to ensure the issue is resolved and the relay operates correctly.

How to erase DTC B1315

To erase DTC B1315, 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 DTC menu on the scanner and select the option to clear or erase codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to ensure the code does not return.

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