AutoCodes – Generic – B12AD

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

Quick Answer

The Heating, Ventilation, and Air-Conditioning (HVAC) Module contains the passenger heated seat control button and indicator. Common causes include Faulty Heater Seat Relay, Faulty Heater Mat, Heater Mat harness is open or shorted. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B12AD indicates Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage.
Common causes: Common causes include Faulty Heater Seat Relay, Faulty Heater Mat, Heater Mat harness is open or shorted.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,226

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B12AD Description

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.

OBDII Code B12AD - Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage - AutoCodes.com — B12AD Code - Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage

What does this mean?

What are the Possible Causes of the DTC B12AD?

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 to Fix the DTC B12AD?

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B12AD code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B12AD code?

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

Need Help with the Code?

Get the B12AD code diagnosed by a professional: Find a repair shop in your area

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

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B12AD Code

1. What are common symptoms of OBDII code B12AD?

The common symptoms of OBDII code B12AD include a non-functional passenger heated seat, failure of the seat heater to turn on or off properly, and potential draining of the vehicle's battery.

2. What causes the Passenger Heated Seat Relay Drive Circuit to short to battery voltage?

The most common cause of the Passenger Heated Seat Relay Drive Circuit shorting to battery voltage is a damaged or faulty seat heating relay, which can lead to an electrical short circuit.

3. How can I diagnose the issue related to OBDII code B12AD?

To diagnose the issue related to code B12AD, you can use a diagnostic scanner to retrieve the specific fault codes, inspect the seat heating relay for any signs of damage, and test the circuit for continuity and shorts using a multimeter.

4. Can I still drive my vehicle with OBDII code B12AD?

It is not recommended to drive your vehicle with OBDII code B12AD, as the short circuit can potentially cause electrical issues or even a fire hazard. It is best to address the problem promptly.

5. How can I repair OBDII code B12AD?

To repair OBDII code B12AD, you may need to replace the faulty passenger heated seat relay, fix any damaged wiring or connectors in the circuit, and clear the fault codes with a diagnostic scanner after completing the repairs.

6. Are there any temporary fixes for OBDII code B12AD?

There are no recommended temporary fixes for OBDII code B12AD, as the issue requires proper diagnosis and repair to ensure the safety and functionality of the passenger heated seat.

7. Can a DIY enthusiast fix OBDII code B12AD at home?

Depending on your skill level and access to tools, a DIY enthusiast may be able to fix OBDII code B12AD at home by following repair guides, but it is recommended to consult a professional if you are unsure of the diagnosis or repair process.

8. How much does it typically cost to repair OBDII code B12AD at a repair shop?

The cost to repair OBDII code B12AD at a repair shop can vary depending on the extent of the damage, parts needed, and labor rates. It is advisable to get quotes from different shops for an accurate estimate.

9. Will fixing OBDII code B12AD affect my vehicle's warranty?

If your vehicle is still under warranty, it is recommended to check with the manufacturer or dealership to see if the repair for OBDII code B12AD is covered under warranty to avoid any out-of-pocket expenses.

10. How can I prevent OBDII code B12AD from occurring in the future?

To prevent OBDII code B12AD from occurring in the future, it is essential to perform regular maintenance checks on the seat heating system, avoid overloading the circuit, and address any electrical issues promptly to prevent shorts.