Prior to upgrading the PCM on early-production 2009 Acura RL and TSX, the AcuraLink Update Connector must be disconnected.
On some 2009 RL and TX vehicles, an AcuraLink control unit (XM receiver) communication error requires that you disconnect the AcuraLink control unit 5P update connector before performing a PCM update. If the AcuraLink update connector is not disconnected, the PCM may not accept the update, or the engine may not start after the update.
Affected vehicles include the 2009 RL (with Tech Package) from VIN JH4KB266.9C000001 through JH4KB266.9C002248; 2009 TL (with Tech Package) from VIN 19UUA86..9A000001 through 19UUA86..9A006232; and 2009 TSX (with Tech Package) from VIN JH4CU2…9C000001 through JH4CU2…9C033097.
RL MODEL
With the ignition off, remove the trunk left side trim panel. Locate and disconnect the Acura Link control unit 5P update connector. Perform the PCM update, reconnect the AcuraLink control unit 5P and reinstall the trunk left side trim panel. The flat rate time is listed at 0.2 hour.
TL MODEL
Make sure that the engine start/stop button is in OFF mode. Remove the glove box. Locate and disconnect the AcuraLink control unit 5P update connector. Perform the update to the PCM, and then reconnect the update connector and reinstall the glove box.
TSX MODEL
With ignition off, remove the rear seat right side bolster. Locate and disconnect the AcuraLink control unit 5P update connector. Perform the PCM update, and then reconnect the update connector and replace the seat bolster.
