SECTION VIIC SERVICE PROGRAMMING SYSTEM
2005 Tech 2 User’s Guide VII - 64
5. Locate the PCM and disconnect the vehicle harness connectors from the PCM.
6. Connect the J-45211 harness connectors to the PCM.
7. Connect the J-45211 power clips directly to the vehicle battery terminals. If the battery terminals are
inaccessible, or the battery is not located under the hood, then connect to the engine block (ground),
and to the underhood source of vehicle battery’s positive 12-volt power.
8. Observe the red battery LED on the J-45211. The red LED should remain lit whenever the J-45211 is
connected to the battery voltage. If the red LED does not illuminate, check the tool’s five-amp fuse. If
the fuse is good and yet the red LED will not illuminate, contact 1-800-GM-TOOLS (1-800-468-6657)
for assistance.
9. Toggle the power switch on J-45211 to apply ignition voltage to the PCM.
10. The yellow and green LEDs should illuminate when the power switch is toggled on. The yellow LED
monitors the ignition voltage being applied to the control module. The green LEDs are a feedback
signal from the control module indicating that the modules’s internal circuits are operating.
11. Connect the Tech 2 to the J-45211 and enter Service Programming System.
12. Select and perform Request Information.
13. After the Tech 2 has completed the information request, toggle the J-45211 switch off.
14. Turn off the Tech 2 and disconnect it from the J-45211.
15. Connect the Tech 2 to the Techline terminal. Download the new PCM calibration into the Tech 2 using
the Techline terminal and TIS software. After the download into the Tech 2 is complete, disconnect the
Tech 2 from the Techline terminal.
16. Reconnect Tech 2 to J-45211 and toggle the tool’s power switch on.
17. Enter Service Programming System, and select and perform Program.
Procedure for the J-45211 continued on next page...
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