Testing the bonding
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
This test can either be performed without the upholstery installed or with partially installed upholstery.
Press at those points as shown. Check that the heater pad follows the compression of the cushion.
There must be no kinks or other defects in the heater pad when it is pressed.