B2107 – OBD-II DTC

OBD-II DTC B2107 – Front Wiper Motor Relay Circuit Short to Vbatt

DTC B2107 meaning

DTC B2107 refers to a diagnostic trouble code indicating a short circuit in the front wiper motor relay circuit to battery voltage (Vbatt). This code is triggered when the vehicle’s onboard diagnostic system detects that the wiper motor relay is receiving an unexpected voltage level, which can lead to improper operation of the windshield wipers.

DTC B2107 symptoms

Common symptoms associated with DTC B2107 may include:

• Windshield wipers not functioning at all
• Wipers operating intermittently or erratically
• Wipers stuck in one position
• Inability to use wiper settings (e.g., low, high, or intermittent)
• Dashboard warning lights illuminated

DTC B2107 causes

Several factors can lead to the triggering of DTC B2107, including:

• Short circuit in the wiring harness connected to the wiper motor relay
• Faulty wiper motor relay
• Defective wiper motor
• Corroded or damaged electrical connectors
• Issues with the vehicle’s body control module (BCM)

DTC B2107 seriousness

DTC B2107 is considered a moderate to serious issue. While it may not affect the vehicle’s ability to operate, it can compromise visibility during rain or adverse weather conditions, posing a safety risk. Immediate attention is recommended to ensure proper wiper functionality.

How to diagnose DTC B2107

To diagnose DTC B2107, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B2107 code.
2. Inspect the wiper motor relay and its wiring for any visible damage or corrosion.
3. Check the electrical connections for continuity and proper voltage.
4. Test the wiper motor relay using a multimeter to ensure it operates correctly.
5. Examine the wiper motor for any signs of malfunction.
6. Clear the code and perform a functional test of the wipers to see if the issue reoccurs.

How to fix DTC B2107 step-by-step instructions

To fix DTC B2107, 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 in the wiper motor relay circuit.
3. Replace the faulty wiper motor relay if testing indicates it is defective.
4. Test the wiper motor for proper operation and replace it if necessary.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Perform a functional test of the windshield wipers to ensure they operate correctly.

How to erase DTC B2107

To erase DTC B2107, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Access the diagnostic menu on the scanner and select the option to clear or erase trouble 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 reappear.

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