B1660 The keyless access unit saw an open in the front interior low frequency antenna circuit

What does B1660 mean on a Honda?

B1660. The keyless access unit saw an open in the front interior low frequency antenna circuit. The smart key may not be detected inside the cabin. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of B1660

• Faulty front interior low frequency antenna
• Front interior low frequency antenna harness is open or shorted
• Front interior low frequency antenna circuit poor electrical connection
• Faulty keyless access control unit
• Corroded or loose connector pins at the antenna

How to fix B1660

1. Confirm the code with a scan tool and check the smart key at that location
2. Inspect the antenna connector and wiring for corrosion, moisture, and loose pins
3. Test the antenna circuit for an open or short with a multimeter
4. Check the wiring before replacing the antenna
5. Replace the front interior low frequency antenna if it fails testing, then clear codes and retest

Sources and review

• Last updated 2026-09-29.