Pass-Thru programming allows the scan tool to remain connected to the terminal and to the vehicle throughout the programming process. The vehicle must be in close proximity to the terminal while using Pass-Thru.

Performing the Pass-Thru Procedure

Important: The TIS supports service programming with the Tech 2 scan tool only.

1. Launch the TIS application at the terminal.
2. Select the Service Programming System.
3. Highlight the following information on the Select Diagnostic Tool and Programming Process screen:

•	Select Diagnostic Tool--Select Pass-Thru

•	Select Programming Process--Identify whether an existing module is being reprogrammed or a module is being replaced with a new one.

•	Select ECU Location--Select vehicle

4. Select Next.
5. Complete all terminal-directed data on the Preparing for Communication/Determine Vehicle screen until Next is highlighted.

Important: In order to reduce the potential for signal loss, the RS-232 cable should not be more than 25 feet long.

6. Select Next.
7. Follow the instructions on the Preparing for Communication screen.
8. Select Next.

Important: The correct VIN must be entered if the vehicle identification number (VIN) does not appear correctly.

9. Verify the VIN on the Validate Vehicle Identification Number screen.
10. Select Next.
11. If an option screen appears, verify the vehicle configuration and/or RPO information.
12. Select Next.
13. Highlight the appropriate control module and programming type on the Supported Controllers screen.
14. Select Next.

Important: Select Cancel if you receive a message stating that the calibration selected is already the current calibration in the control module and reprogramming with the same download is not allowed.

15. Select the proper calibrations on the Calibration Selection screen.
16. Ensure all the folder tabs have a green check mark.
17. Select Next.
18. Verify the current calibrations with the selected calibrations.
19. Select Next.
20. The Transfer Data screen will appear until the progress bar reaches 100 percent. This may take up to 30 minutes.
21. Complete all of the terminal-directed data on the Programming Complete screen.

Important: Some vehicles will require that Idle Learn, TP Learn, Theft Deterrent Relearn, or Crankshaft Variation Learn procedures be performed after programming. Consult the appropriate service information for these procedures.

22. Turn OFF the Tech 2.
23. Disconnect the Tech 2 from the vehicle.