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HOMESERVICE MANUALSMERCURY2011MARINER PREMIER, 2.5 7, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXGLASS, FRAMES & MECHANISMS DTCSHVAC MODULE
2011 Mercury Mariner Premier, 2.5 7, AWD

HVAC Module

2011 Mercury Mariner Premier, 2.5 7, AWDSECTION HVAC Module
HVAC MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC Description Action
B12BE Heated Backlight/Mirror Relay Drive Circuit Shorted to Battery Voltage GO to PINPOINT TEST F .
B12BF Heated Backlight/Mirror Relay Drive Circuit Open or Shorted to Ground If the rear window does not defrost, GO to PINPOINT TEST F . If the rear window defrost does not turn off,
GO to PINPOINT TEST G .
B1C83:12 Rear Defog Relay: Circuit Short to Battery GO to PINPOINT TEST F .
B1C83:14 Rear Defog Relay: Circuit Short to Ground or Open If the rear window does not defrost, GO to PINPOINT TEST F . If the rear window defrost does not turn OFF,
GO to PINPOINT TEST G .
All other DTCs - REFER to the Master DTC Chart in MULTIFUNCTION ELECTRONIC MODULE article.
RENDER: 1.0x

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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.