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 MANUALSCHRYSLER2003300M V6-3.5L VIN MREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULETESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESREAR WINDOW DEFOGGERREAR WINDOW DEFOGGER INOPERATIVE (ATC)
2003 Chrysler 300M V6-3.5L VIN M
Rear Window Defogger Inoperative (ATC)
2003 Chrysler 300M V6-3.5L VIN MSECTION Rear Window Defogger Inoperative (ATC)
Test 1 - 3:
Test 4 - 8:
Test 9 - 11:
SYMPTOM
REAR WINDOW DEFOGGER INOPERATIVE WITH ATC
POSSIBLE CAUSES
- Rear defog operates OK
- Defogger grid ground circuit open
- Rear window defogger grid open
- Rear window defogger relay-open
- Rear defogger relay output circuit open
- Rear window defogger relay control circuit open
- Rear window defogger relay output shorted to ground
- Fused B+ circuit open
- Fused B+ shorted to ground
- Body control module - rear defogger relay control open
- ATC head-rear defog switch
RENDER: 1.0x
NO RELATED
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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.