B1477 – OBD-II DTC

OBD-II DTC B1477 – Wiper Hi/Low Circuit Motor Short To Ground

DTC B1477 meaning

DTC B1477 refers to a diagnostic trouble code indicating a short circuit to ground in the wiper high/low circuit motor. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components to ensure proper functionality. When the wiper motor experiences an electrical fault, such as a short to ground, the vehicle’s computer detects this issue and triggers the code.

DTC B1477 symptoms

Common symptoms associated with DTC B1477 may include:

• Wipers not functioning at all
• Wipers operating only at one speed
• Intermittent wiper operation
• Wipers stuck in one position
• Dashboard warning lights illuminated

DTC B1477 causes

Several factors can lead to the occurrence of DTC B1477, including:

• Damaged wiring or connectors in the wiper motor circuit
• Faulty wiper motor
• Corrosion or moisture in electrical connections
• Short circuit due to wear and tear
• Malfunctioning wiper switch

DTC B1477 seriousness

DTC B1477 is considered a serious issue as it directly affects the functionality of the windshield wipers. Inadequate wiper performance can impair visibility during rain or adverse weather conditions, increasing the risk of accidents. Therefore, it is essential to address this code promptly to ensure safe driving conditions.

How to diagnose DTC B1477

To diagnose DTC B1477, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the code.
2. Inspect the wiper motor and associated wiring for visible damage.
3. Check for loose or corroded connections in the wiper circuit.
4. Test the wiper motor for proper operation using a multimeter.
5. Examine the wiper switch for functionality.
6. Perform continuity tests on the wiring to identify shorts to ground.

How to fix DTC B1477 step-by-step instructions

To fix DTC B1477, 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 wiper circuit.
3. Replace the wiper motor if it is found to be faulty.
4. Clean any corrosion from electrical connections.
5. Test the wiper switch and replace it if necessary.
6. Reconnect the battery and clear the DTC using an OBD-II scanner.
7. Test the wipers to ensure they operate correctly.

How to erase DTC B1477

To erase DTC B1477, 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 “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 verify that the code does not reappear.

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