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.
2003 Mercury MarauderFACTORY OEM SERVICE PROCEDURE
Climate Control Systems DTCS
ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Perform Test |
|---|---|---|
| B1249 | Blend door short or failure | Go to PINPOINT TEST A |
| B1251 | In-car temperature sensor open circuit | Go to PINPOINT TEST B . |
| B1253 | In-car temperature sensor short to ground | Go to PINPOINT TEST B |
| B1255 | Ambient temperature sensor open circuit | Go to PINPOINT TEST C . |
| B1257 | Ambient temperature sensor short to ground | Go to PINPOINT TEST C . |
| B1260 | A/C solar radiation sensor open circuit | Go to PINPOINT TEST D . |
| B1261 | Solar radiation sensor circuit short to ground | Go to PINPOINT TEST D . |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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