AutoCodes – Lincoln – B12AD Lincoln

B12AD Lincoln 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 Lincoln 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 941

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

What does this mean?

What are the Possible Causes of the DTC B12AD Lincoln?

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 Lincoln?

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 Lincoln 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 Lincoln code?

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

Need Help with the Code?

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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 Lincoln Code

1. What are the common symptoms of OBDII code B12AD in a Lincoln indicating the Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage?

- Common symptoms include a non-functioning passenger heated seat, a seat that heats up uncontrollably, and potential electrical malfunctions in the vehicle.

2. What are the possible causes of the OBDII code B12AD in a Lincoln related to the Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage?

- Causes can include a short circuit in the wiring, a faulty seat heating relay, a damaged seat heating element, or a malfunctioning control module.

3. How can I diagnose the issue causing OBDII code B12AD in a Lincoln for the Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage?

- Diagnose the problem by checking the wiring for any visible damage, testing the seat heating relay, inspecting the seat heating element for continuity, and using a diagnostic scanner to read the code.

4. What are some repair tips for addressing OBDII code B12AD in a Lincoln due to the Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage?

- Repair tips include repairing any damaged wiring, replacing the faulty seat heating relay, fixing or replacing the damaged seat heating element, and resetting the control module after repairs.

5. Can I drive my Lincoln with the OBDII code B12AD related to the Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage?

- It is not recommended to drive the vehicle with this fault as it can cause further damage to the electrical system and potentially pose a safety hazard.

6. How much does it typically cost to repair OBDII code B12AD in a Lincoln for the Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage?

- The cost of repair can vary depending on the extent of the damage and the parts needed, but it can range from a few hundred to over a thousand dollars, including parts and labor.

7. Can I reset the OBDII code B12AD in a Lincoln for the Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage myself?

- You can attempt to reset the code yourself by disconnecting the vehicle's battery for a few minutes, but it is important to address the underlying issue causing the fault code to prevent it from reoccurring.

8. Are there any recalls or technical service bulletins related to OBDII code B12AD in a Lincoln for the Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage?

- Check with your local Lincoln dealership or visit the manufacturer's website to see if there are any recalls or technical service bulletins related to this specific fault code.

9. Is it safe to continue using the other seat heaters in my Lincoln if I have the OBDII code B12AD for the Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage?

- It is best to avoid using any seat heaters in the vehicle until the issue is resolved to prevent any potential electrical problems or safety hazards.

10. How long does it typically take to repair OBDII code B12AD in a Lincoln for the Passenger Heated Seat Relay Drive Circuit Shorted To Battery Voltage?

- The repair time can vary depending on the complexity of the issue, but it may take a few hours to a full day to diagnose and fix the problem properly.