Section 767 (Heated Seats (Service Information)): Operation

WARNING: This page is about a different car, the 2020 Chrysler 300 and 2019 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

The Heated Seat Module (HSM) directly provides power to the seat heating elements in the seat cushions and backs for seat heating. Fused ignition (run) circuits are used, so that the heated seat system will only operate when the ignition switch is in the On position and the engine is running. The module responds to heated seat thermistor sensor feedback from each heating element and ignition switch status inputs by controlling the electrical output to the front seat heating elements. The heated seat system will turn off automatically whenever the ignition switch is turned to any position except Run.

The HSM energizes the integral solid-state relays that supply battery current to the heating elements. When high-temperature level heating is initially selected, the HSM provides a boosted high-heat level until the feedback sensor threshold is reached. The HSM then drops the heat output to the normal high-temperature level for approximately 30 minutes of operation. During high-temperature level operation, the HI indicator illuminates in the switch. After a total of approximately 40 minutes of operation in HIGH mode, the HSM will switch automatically to LOW (indicator follows with LOW display). At that time, the LO indicator illuminates. Operation on the low-temperature level setting will automatically turn off after 45 minutes.

The driver seat heat system and passenger seat heat system each consist of a cushion element connected in parallel with a back element. Both systems have a seat cushion with a thermistor sensor that provides feedback to the HSM. The thermostat will intervene and disable heated any of the heated seat elements in case of module failure to protect occupants from excessive heat exposure.

The driver seat heat system and passenger seat heat system each consist of a cushion element connected in parallel with a back element. Both systems have a seat cushion with a thermistor sensor that provides feedback to the HSM. Both systems seat cushion and seat back have a thermostat that will request the heated seat to turn off if the temperature reaches or exceeds 54° C +/-9 (135 °F +/- 9). The HSM will also turn off the heated seat elements if an open or short in the heating element circuit is detected.

Auto On Feature: The Auto On feature is a customer configured feature that when enabled will activate the driver heated seat and heated steering wheel on engine start based on ambient temperature. If Auto On feature is enabled, and the ambient temperature is at or below 4° C (40° F) the HSM will activate the driver heated seat and heated steering wheel feature at the high level during engine start. This feature also works when using remote start.