B2345 – OBD-II DTC

OBD-II DTC B2345 – Seat Switch Reference Voltage Negative Common Open Circuit

DTC B2345 meaning

DTC B2345 refers to a diagnostic trouble code indicating an issue with the seat switch reference voltage. Specifically, it signifies a negative common open circuit in the seat switch circuit. This means that the vehicle’s onboard diagnostic system has detected that the reference voltage for the seat switch is not functioning correctly, which can affect the operation of the seat adjustment features.

DTC B2345 symptoms

Common symptoms associated with DTC B2345 may include:

• Inability to adjust the seat position.
• Warning lights illuminated on the dashboard.
• Malfunctioning seat heating or cooling features.
• Other related electrical issues in the seating system.

DTC B2345 causes

The causes of DTC B2345 can vary, but typical reasons include:

• Faulty seat switch.
• Damaged wiring or connectors in the seat switch circuit.
• Corrosion or poor connections at the seat switch or related components.
• Issues with the body control module (BCM) or other control modules.

DTC B2345 seriousness

DTC B2345 is considered a moderate issue. While it may not prevent the vehicle from operating, it can lead to a lack of functionality in the seat adjustment features, which can affect driver and passenger comfort and safety. It is advisable to address this code promptly to ensure all seat functions operate correctly.

How to diagnose DTC B2345

To diagnose DTC B2345, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the seat switch and its wiring for visible damage or disconnections.
3. Check the resistance and continuity of the seat switch circuit.
4. Test the reference voltage at the seat switch connector.
5. Examine the body control module for any related fault codes or issues.

How to fix DTC B2345 step-by-step instructions

To fix DTC B2345, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety.
2. Inspect and repair any damaged wiring or connectors in the seat switch circuit.
3. Replace the seat switch if it is found to be faulty.
4. Reconnect all connectors and ensure they are secure.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test the seat adjustment functions to ensure they are working properly.

How to erase DTC B2345

To erase DTC B2345, 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.
4. Select the option to clear or erase trouble codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to ensure the code does not return.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.