B1620 – OBD-II DTC

OBD-II DTC B1620 – Wiper Rear Low Limit Input Circuit Open

DTC B1620 meaning

DTC B1620 refers to a diagnostic trouble code indicating an issue with the rear wiper’s low limit input circuit. This code is triggered when the vehicle’s onboard diagnostic system detects an open circuit in the rear wiper low limit switch, which is responsible for signaling the wiper control module when the wiper is in its resting position.

DTC B1620 symptoms

Common symptoms associated with DTC B1620 may include:

• Rear wiper not functioning at all
• Intermittent operation of the rear wiper
• Wiper motor running continuously
• Dashboard warning lights illuminated

DTC B1620 causes

The causes of DTC B1620 can vary, but typical reasons include:

• Faulty rear wiper low limit switch
• Damaged wiring or connectors in the wiper circuit
• Corrosion or poor connections at the wiper motor
• Malfunctioning wiper control module

DTC B1620 seriousness

DTC B1620 is considered a moderate issue. While it may not affect the vehicle’s overall drivability, it can impair the functionality of the rear wiper, which is important for visibility in adverse weather conditions. Addressing this code promptly is advisable to ensure safe driving.

How to diagnose DTC B1620

To diagnose DTC B1620, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1620 code.
2. Inspect the rear wiper low limit switch for any visible damage or wear.
3. Check the wiring and connectors for signs of corrosion or disconnection.
4. Test the continuity of the circuit from the switch to the wiper control module.
5. Examine the wiper control module for any faults or error codes.

How to fix DTC B1620 step-by-step instructions

To fix DTC B1620, follow these steps:

1. Repair or replace any damaged wiring or connectors found during diagnosis.
2. If the rear wiper low limit switch is faulty, replace it with a new one.
3. Ensure all connections are secure and free from corrosion.
4. Test the wiper motor to ensure it operates correctly after repairs.
5. Clear the DTC using an OBD-II scanner and perform a test drive to confirm the issue is resolved.

How to erase DTC B1620

To erase DTC B1620, 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. 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 ensure the code does not reappear.

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