Honda diagnostic system (HDS)

Honda interface module (HIM)

HDS pocket tester

Use this procedure when you need to update the VSA modulator-control unit during troubleshooting procedures.

Make sure the HDS/HIM has the latest software version.

Before you update the VSA modulator-control unit, make sure the battery in the vehicle is fully charged, and connect a jumper battery (not a battery charger) to maintain system voltage.

Never turn the ignition switch to LOCK (0) during the update. If there is a problem with the update, leave the ignition switch to ON (II).

To prevent VSA modulator-control unit damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power windows, door locks, etc.) during the update.

To ensure the latest program is installed, do a VSA modulator-control unit update whenever the VSA modulator-control unit is substituted or replaced.

You cannot update a VSA modulator-control unit with a program it already has. It will only accept a new program.

If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) light came on or was flashed during the update, leave the ignition switch in ON (II) when you disconnect the HIM from the data link connector (DLC). This will prevent VSA modulator-control unit damage.

DTCs stored in memory are cleared when the VSA modulator-control unit is updated.