Engine-Codes - Generic - B12AD

B12AD Code - Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage

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

|B12AD 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 B12AD 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 B12AD code

Labor: 1.0

The cost to diagnose the B12AD 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 B12AD code possible symptoms?

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

|What is B12AD code meaning?

The Heating, Ventilation, and Air-Conditioning (HVAC) Module contains the passenger 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 passenger 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 passenger heated seat relay coil when the engine is running. The ground is supplied to the opposite side of the passenger relay coil by the HVAC module from the passenger heated seat relay drive circuit when the passenger 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 passenger heater mat circuit. The passenger heater mats are directly connected to ground circuit completing the electrical circuit to heat the seat.

|Need more information with the B12AD code?

Need more information on how to fix the B12AD code?
Get Access to Factory Service Manuals

|B12AD code information for specific makes

  • B12AD FORD Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage
  • B12AD LINCOLN Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage
  • B12AD MERCURY Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage

|Need help with a B12AD code?

Get the B12ad code diagnosed by a professional: Find a repair shop in your area