How to Update the PCM

How to Update the PCM

NOTE:
^ To ensure the latest program is installed, update a PCM whenever the PCM is substituted or replaced.
^ Select A/T in the HIM EGM/PCM Update menu, and update the A/T system on the PCM. Update the PGM-FI system on the PCM if necessary, according to the update software.
^ You cannot update a PCM with the program it already has. It will only accept a new program.
^ Before you update the PCM, make sure the vehicles battery is fully charged.
^ To prevent PCM damage, do not operate any electrical system; audio system, brakes, air conditioning, power windows, moon roof, and door locks, during the update.
^ If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) light came on or was flashing during the update, leave the ignition switch in the ON (II) position when you disconnect the HIM from the data-link connector (DLC). This will prevent PCM damage.

1. Turn the ignition switch ON (II). Do not start the engine.
2. Connect the HDS or the Honda interface module (HIM) to the DLC (A).





3. Update the PCM according to the procedures described on the HIM label. If the software in the PCM is the latest, replace the PCM.