Service Information
- Rolling code tables are rigidly assigned. For this reason, ECM control modules can not be swapped from another vehicle and re-aligned for troubleshooting purposes.
- Replacement EWS 3.3 control modules are ordered VIN specifically. They are received with the same rolling code table as the original module. Once ZCS encoded, the DIS software "resets" the current rolling code in the DME back to rolling code #1, providing synchronization in both modules.
- Replacement ECM control modules are "off the shelf parts" and are "blank". After ECM programming, the DIS software informs the EWS control module that a new ECM has been installed. With this information the EWS will send the entire rolling code table to the ECM on the next key on condition. It also resets itself to rolling code #1. The DIS software then informs the ECM that the first code it receives from the EWS is actually the rolling code table. When it's received ECM automatically "burns" it into its memory.
- The alignment procedure is still available in the SERVICE FUNCTIONS menus of EWS or ECM. This procedure only "resets" the rolling codes back to #1 in each module. It does not change the coding tables. The ignition key must be switched off for 10 seconds after the adjustment is completed.
- Final note: Once a DME control module is programmed it can not be used in any other vehicle.