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 MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1104 (SEAT SYSTEM)DIAGNOSTIC TESTSSEATSHVAC MODULE DTC CHART
2009 Mercury Milan Premier, 3.0 1, AWD
HVAC Module DTC Chart
2009 Mercury Milan Premier, 3.0 1, AWDSECTION HVAC Module DTC Chart
WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Only the heated seat system related DTCs are listed. For all other HVAC module DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES
article.
| DTC | Description | Action |
|---|---|---|
| B12AB | Drivers Heated Seat Relay Drive Circuit Shorted to Battery Voltage | Go to Pinpoint Test G . |
| B12AC | Drivers Heated Seat Relay Drive Circuit Open or Shorted to Ground | Go to Pinpoint Test G . |
| B12AD | Passenger Heated Seat Relay Drive Circuit Shorted to Battery Voltage | Go to Pinpoint Test H . |
| B12AE | Passenger Heated Seat Relay Drive Circuit Open or Shorted to Ground | Go to Pinpoint Test H . |
| All Other DTCs | - | REFER to MULTIFUNCTION ELECTRONIC MODULES article. |
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.