Preliminary Test

WARNING: This page is about a different car, the 2004 Dodge Intrepid, 2004 Chrysler Intrepid, 2004 Chrysler Concorde, and 2004 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.

Before testing the individual components in the heated seat system, check the following:

Using the DRB III(R) scan tool, check the memory heated seat/mirror module (MHSMM) for any stored fault codes. Record these codes on paper for reference and resolve using the appropriate Body Diagnostic Procedures Manual.
Check the vehicles battery open-circuit voltage and charging system performance. If the vehicles electrical system is defective or weak it may not be suppling sufficient energy to operate the system in question.
Test each of the circuits from the heated seat switch, elements, and sensors, to the MHSMM. Repair any shorts or open circuits as required.