Found this part (blue connecter) connected to radiator timer wires when replacing the radiator timer. Anybody know what it used for?

 

You should list the year of the car. However, that looks to be a 5th gen Accord.

The 2P blue connector is the SCS (service check signal) connector. If the car had a trouble code, it can be used to retrieve the trouble code(s) by counting the blinks/flashes of the trouble indicator lamp (e.g., Check Engine Light, SRS, D4) on the instrument cluster.

The SCS connector can be unplugged from the larger blue holder and jumped to retrieve existing code(s).

 

thanks for the quick response and yes it's a 5th gen accord. Guess you learn something new everyday thanks for the answer I appreciate it.