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.
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HOMESERVICE MANUALSCHRYSLER1999300M V6-3.5L VIN GREPAIR AND DIAGNOSISBODY AND FRAMERELAYS AND MODULES - BODY AND FRAMESEAT TEMPERATURE CONTROL MODULETESTING AND INSPECTION
1999 Chrysler 300M V6-3.5L VIN G
Seat Temperature Control Module: Testing and Inspection
1999 Chrysler 300M V6-3.5L VIN GSECTION Testing and Inspection
Before testing the Memory Heated Seat / Mirror Module (MHSMM), test the heated seat switches, the heated seat elements, and the heated seat sensors. If there are no problems, proceed as follows:
- Replace the current MHSMM with a known good module, and test the operation of the heated seats. If OK, discard the faulty MHSMM. If the problem persists, proceed.
- Test each of the circuits from the heated seat switch, elements, and sensors to the MHSMM. Repair any shorts or open circuits as required.
- Replace the current MHSMM with a known good module, and test the operation of the heated seats. If OK, discard the faulty MHSMM. If the problem persists, proceed.
- Test each of the circuits from the heated seat switch, elements, and sensors to the MHSMM. Repair any shorts or open circuits as required.
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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.