B12B2 MERCURY - Front Blower Motor PWM Drive Circuit Open or Shorted to Ground
B12B2 MERCURY Possible Causes
- Faulty Front Blower Motor Fuse
- Faulty Front Blower Motor Relay
- Front Blower Motor Relay harness is open or shorted
- Front Blower Motor Relay circuit poor electrical connection
- Faulty Front Blower Motor
- Faulty Electronic Manual Temperature Control (EMTC) Module
How do I fix code B12B2 MERCURY?Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
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Cost of diagnosing the B12B2 MERCURY code
Labor: 1.0The cost of diagnosing the B12B2 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
- Engine Light ON (or Service Engine Soon Warning Light)
B12B2 MERCURY DescriptionUnder normal operation, the blower motor relay coil receives ignition voltage through the circuit. The coil receives ground from the Electronic Manual Temperature Control (EMTC) Module through the circuit if any function selector position but OFF is selected. Voltage is supplied to the relay switch contact. When the relay coil is energized, the voltage is delivered to the blower motor through the circuit. Ground for the blower motor is provided through the circuit from the blower resistor or the blower switch (HI). The blower resistor and blower switch are grounded through the circuit. The module senses no voltage on the blower motor control Pulse Width Modulation (PWM) circuit, indicating an open or a short directly to ground.
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