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B12AC Mercury Code - Drivers Heated Seat Relay Drive Circuit Open Or Shorted to Ground

- Code Popularity: 585 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B12AC Mercury?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Heater Seat Relay
  • Faulty Heater Mat
  • Heater Mat harness is open or shorted
  • Heater Mat circuit poor electrical connection
  • Faulty Heating, Ventilation, and Air-Conditioning (HVAC) Module
⚠ Does your Mercury have Safety Recalls? → Check here

How to Fix the DTC B12AC Mercury?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for B12AC Mercury Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B12AC Mercury code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code B12AC Mercury Description

The Heating, Ventilation, and Air-Conditioning (HVAC) Module contains the driver heated seat control button and indicator. The heated seat system functions independently from the climate control system. A heated seat relay is located underneath the driver seat cushion frame. There are 2 voltage supplies to the heated seat relay. Voltage is supplied from the Smart Junction Box (SJB) heated seat relay enable circuit to the driver heated seat relay coil when the engine is running. Ground is supplied to the opposite side of the driver relay coil by the HVAC module driver heated seat relay drive circuit when the driver heated seat switch button is pressed to energize the relay. This closes the relay contacts to supply battery voltage from the SJB circuit to the driver heater mat circuit. The driver heater mats are directly connected to ground circuit completing the electrical circuit to heat the seat.

OBDII Code B12AC Mercury - Drivers Heated Seat Relay Drive Circuit Open Or Shorted to Ground - AutoCodes.com
B12AC Mercury Code - Drivers Heated Seat Relay Drive Circuit Open Or Shorted to Ground

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Code B12AC Mercury comments

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