B1243 – Express Window Down Switch Circuit Short to Battery

The ODBII code B1243 indicates a malfunction in the express window down switch circuit, specifically a short circuit to the battery, which means the circuit is receiving continuous power when it shouldn’t be.

The severity of ODBII code B1243 is generally considered moderate.

Common Causes For: B1242 Air Flow Recirculation Door Driver Circuit Failure

• Shorted wiring or connectors
• Faulty express window down switch
• Malfunctioning window motor
• Corroded or damaged electrical connections
• Faulty body control module (BCM)
• Water intrusion or moisture damage
• Improper installation or modifications to the window system

Common misdiagnosis for B1243 Express Window Down Switch Circuit Short to Battery

• Faulty window motor
• Defective window regulator
• Malfunctioning body control module (BCM)
• Wiring harness issues
• Faulty power window switch
• Battery or charging system problems
• Ground connection issues

Common Troubleshooting Steps

When dealing with an OBD-II code B1243, which indicates a problem with the Express Window Down Switch Circuit Short to Battery, you can follow these common troubleshooting steps:

• Verify the Code: Use an OBD-II scanner to confirm that the B1243 code is present. Clear the code and see if it returns after a short drive.
• Inspect the Wiring and Connectors:
• Check the wiring harness and connectors associated with the express window down switch for any signs of damage, fraying, or corrosion.
• Look for any exposed wires that may be shorting to the battery or ground.
• Check the Switch:
• Test the express window down switch for proper operation. You can use a multimeter to check for continuity and ensure that the switch is functioning correctly.
• If the switch is faulty, replace it.
• Inspect the Window Motor:
• Check the window motor for any signs of failure. A malfunctioning motor can sometimes cause issues in the circuit.
• Test the motor by applying direct power to see if it operates correctly.
• Examine the Power Supply:
• Ensure that the power supply to the switch and motor is correct. Check for proper voltage and ground at the switch and motor terminals.
• Look for any blown fuses in the circuit that could affect operation.
• Check for Short Circuits:
• Use a multimeter to check for shorts in the wiring. Disconnect the battery and test the resistance between the switch circuit and ground.
• If you find a short, trace the wiring to locate the source of the short.
• Inspect Related Components:
• Check any related components, such as relays or control modules, that may be involved in the window operation.
• Ensure that these components are functioning correctly and are not causing the issue.
• Consult Wiring Diagrams:
• Refer to the vehicle’s wiring diagrams to understand the circuit layout and identify any other components that may be involved in the express window system.
• Perform a System Reset:
• After repairs, clear the code and perform a system reset. Test the window operation to ensure the issue is resolved.
• Seek Professional Help:
• If the problem persists after performing these steps, consider seeking assistance from a professional mechanic or automotive technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1243 code.