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The diagnostic trouble code 56 indicates a high resistance in the passenger-side airbag squib circuit. The airbag squib is responsible for deploying the passenger-side airbag in the event of a collision.

Here are some possible causes and solutions for this issue:

1. Faulty wiring or connectors: Inspect the wiring harness and connectors associated with the passenger-side airbag squib circuit. Look for any signs of damage, loose connections, or corrosion. Repair or replace any damaged wiring or connectors as needed. Ensure that the connections are secure and properly seated.
2. Faulty airbag squib: The passenger-side airbag squib itself may be faulty and causing the high resistance. In this case, the squib should be inspected and replaced if necessary. Consult the vehicle’s service manual for the specific testing procedures for the airbag squib.
3. Clock spring malfunction: Similar to the driver-side airbag squib circuit, a faulty clock spring can also cause issues with the passenger-side airbag squib circuit. Have the clock spring tested and replaced if necessary.
4. Diagnostic equipment malfunction: As with any diagnostic trouble code, it’s important to consider the possibility of the diagnostic equipment itself malfunctioning. Try using a different diagnostic tool or consult a professional mechanic to verify the diagnosis.

It’s crucial to address this issue promptly to ensure the proper functioning of the passenger-side airbag in the event of an accident. If you’re unsure or uncomfortable performing these steps yourself, it’s recommended to seek assistance from a qualified mechanic or dealership. They will have the expertise and tools to accurately diagnose and resolve the high resistance issue indicated by the diagnostic trouble code 56.