Testing the function of the heater pad
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.
Start the seat heater and check the function.
NOTE:
The test is not possible if the ambient temperature is too high.