why is my Ford Mustang S550 (2015-2023) airbag light on after a battery replacement?

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, and screwdrivers.
• Ensure the vehicle is parked on a level surface and the ignition is turned off.
• Disconnect the negative battery terminal to prevent accidental deployment of the airbag.

2. Check Battery Connections

• Reconnect the battery, ensuring that the terminals are clean and secure.
• Inspect the positive and negative connections for proper fit and corrosion.

3. Inspect Airbag Wiring

• Remove the driver and passenger side lower dash covers to access airbag wiring.
• Visually inspect all harnesses and connectors for damage, loose connections, or corrosion.
• If damage is found, repair or replace the wiring harness as necessary.

4. Check Fuses

• Locate the fuse box and identify the fuses related to the airbag system.
• Use a multimeter to test for continuity in the airbag fuses.
• Replace any blown fuses with the correct amperage rating as specified in the owner’s manual.

5. Clear Error Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to reset the airbag system and clear any stored error codes.
• Turn the ignition on to check if the airbag light remains off.