Loose Surface Switch LED

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

The EBCM illuminates the LED indicator, part of the TC2 switch, when the following occurs:

The EBCM performs the displays test at the start of each ignition cycle. The LED indicator illuminates for approximately 3 seconds.
The EBCM flashes the Loose Surface Switch LED during the transition between modes. Once the transition is complete, the EBCM does not flash the LED.
Entering Loose Surface Mode, the LED remains illuminated.
Entering normal Surface Mode, the LED remains off.