B1622 – OBD-II DTC

OBD-II DTC B1622 – Wiper Rear Low Limit Input Circuit Short To Ground

DTC B1622 meaning

DTC B1622 refers to a diagnostic trouble code indicating a problem with the rear wiper low limit input circuit. Specifically, it suggests that there is a short to ground in the circuit that monitors the position of the rear wiper. This can prevent the rear wiper from functioning correctly, as the system is unable to determine its position accurately.

DTC B1622 symptoms

Common symptoms associated with DTC B1622 may include:

• Rear wiper not functioning at all
• Intermittent operation of the rear wiper
• Rear wiper operating in the wrong position
• Dashboard warning lights illuminated

DTC B1622 causes

Several factors can lead to the occurrence of DTC B1622, including:

• Damaged wiring or connectors in the rear wiper circuit
• Faulty rear wiper motor
• Defective wiper control module
• Corrosion or poor connections in the circuit

DTC B1622 seriousness

The seriousness of DTC B1622 can vary depending on the vehicle’s use. While it may not affect the vehicle’s overall drivability, it can hinder visibility during inclement weather, making it a safety concern. It is advisable to address this issue promptly to ensure proper rear wiper functionality.

How to diagnose DTC B1622

To diagnose DTC B1622, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the wiring and connectors related to the rear wiper circuit for damage or corrosion.
3. Check the rear wiper motor for proper operation.
4. Test the wiper control module for faults.
5. Perform continuity tests on the circuit to identify any shorts to ground.

How to fix DTC B1622 step-by-step instructions

To fix DTC B1622, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety.
2. Inspect and repair any damaged wiring or connectors in the rear wiper circuit.
3. Replace the rear wiper motor if it is found to be faulty.
4. Test and replace the wiper control module if necessary.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test the rear wiper to ensure it operates correctly.

How to erase DTC B1622

To erase DTC B1622, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Access the trouble codes menu on the scanner.
3. Select the option to clear or erase the codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and perform a test drive to ensure the code does not return.

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