Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Heated Seats
1999 Chrysler 300M V6-3.5L VIN GSECTION Heated Seats
The controls for the heated seats are located on the side of each seat. The system offers two seat temperature settings of approximately 98.6 F (LO) and approximately 107.6 F (HI).
As the temperature in the seat rises, the Negative Temperature Coefficient (NTC) resistance decreases and the voltage reading detected by the memory heated seat/mirror module (MHSMM) increases. The seat heater output is deactivated once the voltage reading reaches it's upper threshold for either setting, high or low.
As the temperature decreases, the voltage reading decreases until the lower threshold is reached for either setting high or low. At this point the seat heat output is activated once again and this cycle repeats itself as long as the seat heat request is on. The thresholds for low and high settings are pre-programmed into the MHSMM memory.
The heated seat switch contain resistors pulled up to ignition which are processed by the MHSMM as voltage readings indicating desired heat setting high or low.
As the temperature in the seat rises, the Negative Temperature Coefficient (NTC) resistance decreases and the voltage reading detected by the memory heated seat/mirror module (MHSMM) increases. The seat heater output is deactivated once the voltage reading reaches it's upper threshold for either setting, high or low.
As the temperature decreases, the voltage reading decreases until the lower threshold is reached for either setting high or low. At this point the seat heat output is activated once again and this cycle repeats itself as long as the seat heat request is on. The thresholds for low and high settings are pre-programmed into the MHSMM memory.
The heated seat switch contain resistors pulled up to ignition which are processed by the MHSMM as voltage readings indicating desired heat setting high or low.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.