Start by checking 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.
The cost to diagnose the B12B1 MERCURY code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
Under normal operation, the blower motor relay coil receives ground from the Electronic Automatic Temperature Control (EATC) Module through the circuit. The coil receives ignition voltage through the circuit. Voltage is supplied to the relay switch contact. When the relay coil is energized, the voltage is delivered to the blower motor and the blower motor speed control module through the circuit. Ground for the motor is provided through the circuit from the blower speed control module. Ground for the blower motor speed control module is provided by the circuit. The EATC module sends a Pulse Width Modulation (PWM) signal to the Blower Motor Speed Control Module through a circuit to control the blower speed.
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