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Use a flathead screwdriver (wrapped in cloth to prevent scratches) to pop the fob casing open.

First, clarity is required. The name "B1A10" follows the Imperial Japanese Navy (IJN) aircraft designation system:

How to perform an when the key is not detected.

: The car may occasionally fail to recognize the key inside the cabin. How to Fix Code B1A10

Here is the specific meaning and common fixes: