B1539 – Mirror Driver Switch Assembly Circuit Failure

The ODBII code B1539 indicates a malfunction in the mirror driver switch assembly circuit, which may involve issues with the wiring, connectors, or the switch itself affecting the operation of the vehicle’s mirror adjustments.

The severity of ODBII code B1539 is generally considered moderate.

Common Causes For: B1538 Memory 2 Switch Circuit Short To Ground

• Faulty mirror driver switch assembly
• Damaged wiring or connectors
• Short circuit in the circuit
• Open circuit in the circuit
• Corrosion or poor connections
• Malfunctioning body control module (BCM)
• Software issues or glitches in the vehicle’s system

Common misdiagnosis for B1539 Mirror Driver Switch Assembly Circuit Failure

• Faulty mirror switch
• Wiring issues or shorts in the circuit
• Defective mirror motor
• Malfunctioning body control module (BCM)
• Incorrectly installed or damaged mirror assembly
• Software or programming errors in the vehicle’s electronics
• Issues with related sensors or components (e.g., position sensors)

Common Troubleshooting Steps

The OBD-II code B1539 indicates a problem with the mirror driver switch assembly circuit. This code is typically associated with issues in the electrical system related to the power mirror controls. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues.
• Inspect the Mirror Switch:
• Remove the mirror switch assembly and visually inspect it for any signs of damage, corrosion, or loose connections.
• Test the switch for continuity using a multimeter. If the switch is faulty, it may need to be replaced.
• Examine Wiring and Connectors:
• Inspect the wiring harness and connectors leading to the mirror switch and the mirrors themselves. Look for frayed wires, broken connections, or signs of wear.
• Ensure that all connectors are securely attached and free of corrosion.
• Check Power and Ground:
• Use a multimeter to check for proper voltage at the mirror switch connector. Ensure that the switch is receiving power when the ignition is on.
• Verify that the ground connection is solid and free of corrosion.
• Test the Mirrors:
• If the switch and wiring appear to be in good condition, test the power mirrors themselves. Use a multimeter to check for voltage at the mirror connectors when the switch is activated.
• If the mirrors do not respond, they may be faulty and require replacement.
• Inspect Fuses:
• Check the vehicle’s fuse box for any blown fuses related to the power mirrors or the mirror switch. Replace any blown fuses and retest the system.
• Look for Short Circuits:
• Inspect the circuit for any potential short circuits that could be causing the failure. This may involve checking for pinched wires or damaged insulation.
• Consult Wiring Diagrams:
• Refer to the vehicle’s service manual for wiring diagrams to understand the circuit layout and identify any other components that may be involved.
• Perform a Reset:
• After addressing any issues, clear the trouble codes using the OBD-II scanner and see if the code returns after a test drive.
• Seek Professional Help:
• If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or an automotive electrician for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the B1539 code.