B1634 – Mirror Driver Left Circuit Short To Ground

The ODBII code B1634 indicates a short circuit in the left mirror driver’s circuit, meaning there is an unintended connection to ground that is affecting the operation of the left side mirror.

The severity of ODBII code B1634 is generally considered moderate.

Common Causes For: B1633 Mirror Driver Left Circuit Short To Battery

• Damaged wiring or connectors in the left mirror circuit.
• Shorted or faulty left mirror motor.
• Malfunctioning mirror switch.
• Corroded or loose electrical connections.
• Faulty body control module (BCM).
• Water intrusion or moisture in the mirror assembly.

Common misdiagnosis for B1634 Mirror Driver Left Circuit Short To Ground

• Faulty left mirror assembly
• Damaged wiring harness
• Shorted wiring connections
• Malfunctioning body control module (BCM)
• Incorrectly installed or defective mirror switch
• Issues with the vehicle’s electrical system
• Faulty ground connections

Common Troubleshooting Steps

When dealing with an OBD-II code B1634, which indicates a “Mirror Driver Left Circuit Short To Ground,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Verify the Code: Use an OBD-II scanner to confirm that the B1634 code is present. Clear the code and see if it returns after a short drive cycle.
• Visual Inspection: **Wiring and Connectors: Inspect the wiring harness and connectors associated with the left mirror. Look for signs of damage, fraying, corrosion, or loose connections.
• **Mirror Assembly: Check the mirror assembly itself for any physical damage that could cause a short circuit.
• Check for Shorts: **Multimeter Testing: Use a multimeter to check for continuity in the mirror driver circuit. Disconnect the mirror connector and test the wires for continuity to ground. A short to ground will show continuity where it shouldn’t exist.
• **Inspect Ground Points: Ensure that the ground connections for the mirror circuit are secure and free of corrosion.
• Test the Mirror Motor: If the wiring appears intact, test the mirror motor itself. You can do this by applying power directly to the motor to see if it operates correctly. If it does not, the motor may be faulty.
• Check the Control Module: If the mirror motor and wiring are functioning correctly, the issue may lie within the control module that operates the mirror. Check for any fault codes related to the body control module (BCM) or any other relevant modules.
• Inspect Related Components: Check other components that may be related to the mirror operation, such as switches or relays. A malfunctioning switch could potentially cause a short circuit.
• Repair or Replace: Based on your findings, repair any damaged wiring or connectors. If the mirror motor or control module is faulty, consider replacing them.
• Clear Codes and Test Drive: After making repairs, clear the codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: If the issue persists, consult the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the mirror circuit.
• Professional Help: If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or an automotive electrician for further diagnosis. By following these steps, you should be able to identify and address the cause of the B1634 code effectively.