How to Update the PCM

Turn the ignition switch ON (II). Do not start the engine.
Connect the Honda Interface Module (HIM) to the Data Link Connector (DLC) (A) located under the driver's side of dashboard.

Fig 1: Connecting Honda Interface Module To Data Link Connector Located Under Driver's Side Of Dashboard
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Do the PCM update procedure as described on the HIM label and in the PCM update system. If the software in the PCM is the latest version, substitute the PCM.