Install a scan tool.

Does the scan tool power up?

Go to Step 2

Go to Scan Tool Does Not Power Up in Data Link Communications

1. Turn ON the ignition, with the engine OFF.
2. Attempt to establish communication with the following:

•	Heater and A/C control module

•	Driver memory seat module

Does the scan tool communicate with the modules?

Go to Step 3

Go to Scan Tool Does Not Communicate with Keyword 82 Data Line in Data Link Communications

Select the display DTCs function on the scan tool for the following modules:

Does the scan tool display any DTCs?

Go to Diagnostic Trouble Code (DTC) List/Type

Go to Symptoms - Stationary Windows