Engine-Codes - Generic - B12AC

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

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

|B12AC code possible 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

|How is the B12AC code repair?

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.

|What is the cost to diagnose the B12AC code

Labor: 1.0

The cost to diagnose the B12AC 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.

|What are B12AC code possible symptoms?

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

|What is B12AC code meaning?

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.

|Need more information with the B12AC code?

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|B12AC code information for specific makes

  • B12AC FORD Drivers Heated Seat Relay Drive Circuit Open Or Shorted to Ground
  • B12AC LINCOLN Drivers Heated Seat Relay Drive Circuit Open Or Shorted to Ground
  • B12AC MERCURY Drivers Heated Seat Relay Drive Circuit Open Or Shorted to Ground

|Need help with a B12AC code?

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