Updating the ECM/PCM

PCM Updating, Substitution and Replacement

Special Tools Required
Honda Interface Module (HIM) P/N EQS05A35570

Use this procedure when you have to substitute a known-good PCM in a troubleshooting procedure. Update the PCM only if the PCM does not already have the latest software loaded.

NOTE: Do not turn the ignition switch OFF while updating; the PCM can be damaged.

How to Update the PCM

NOTE:
- To ensure the latest program is installed, do PCM update whenever the PCM is substituted or replaced.
- Before you update the PCM, make sure the vehicle's battery is fully charged.
- To prevent PCM damage, do not operate anything electrical (audio system, brakes, A/C, power windows, moonroof, door locks, etc.) 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 HIM to the DLC (A) located under the driver's side of dashboard.
3. Do the PCM update procedure as described on the HIM label and In the PCM updates system. If the software in the PCM is the latest version, replace the PCM.

How to Substitute or Replace the PCM

1. Turn the ignition switch OFF.
2. Remove the passenger's dashboard lower cover, the right kick panel, and the glove box.




3. Remove the bolt. Cut the plastic cross brace in the glove box opening with diagonal cutters in the area shown, and discard it.




4. Remove the relays (A), then remove the bolts and the glove box frame (B).




5. Remove the gray 20P PCM wire harness connector from the PCM mounting bracket. Remove the PCM mounting bolt (A) and the bracket.
6. Remove the nuts, then remove the PCM (B).
7. Install the PCM in the reverse order of removal.




8. Connect the HDS to the DLC (A) located under the driver's side of dashboard.
9. Turn the ignition switch ON (II).

NOTE: DTC P0630 "VIN Not Programmed or Mismatch" will be stored at this time, but ignore it and continue this procedure.

10. Input the VIN to the PCM with the HDS.
11. Rewrite the immobilizer code with the PCM replacement procedure in the HDS; it allows you to start the engine.
12. Reset the PCM with the HDS.
13. Do the idle learn procedure.