AutoCodes – Mercury – B1572 Mercury

B1572 Mercury Code - Door Ajar Left Right Switch Circuit Open

Quick Answer

The Smart Junction Box (SJB) sends a voltage signal to the door ajar switches. Common causes include Faulty Door Ajar Left Right Switch, Door Ajar Left Right Switch harness is open or shorted, Door Ajar Left Right Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1572 Mercury indicates Door Ajar Left Right Switch Circuit Open.
Common causes: Common causes include Faulty Door Ajar Left Right Switch, Door Ajar Left Right Switch harness is open or shorted, Door Ajar Left Right Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 587

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B1572 Mercury Description

The Smart Junction Box (SJB) sends a voltage signal to the door ajar switches. The door ajar switch is closed with the door closed. When the door is opened, the signal to ground is interrupted indicating an open door to the SJB. The Diagnostic Trouble Code (DTC) sets when the SJB detects an open from the LH rear door ajar input circuit.

OBDII Code B1572 Mercury - Door Ajar Left Right Switch Circuit Open - AutoCodes.com — B1572 Mercury Code - Door Ajar Left Right Switch Circuit Open

What does this mean?

What are the Possible Causes of the DTC B1572 Mercury?

Faulty Door Ajar Left Right Switch
Door Ajar Left Right Switch harness is open or shorted
Door Ajar Left Right Switch circuit poor electrical connection
Faulty Smart Junction Box (SJB)

How to Fix the DTC B1572 Mercury?

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 B1572 Mercury 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 B1572 Mercury code?

Need more information on how to fix the B1572 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1572 Mercury code diagnosed by a professional: Find a repair shop in your area

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 B1572 Mercury Code

1. What does the OBDII code B1572 mean for a Mercury vehicle?

B1572 indicates an issue with the "Door Ajar Left Right Switch Circuit Open," meaning the vehicle's system has detected an open or faulty circuit in the door ajar switch for one or more doors.

2. What are the common symptoms of code B1572?

Symptoms include the door ajar warning light staying on, interior dome lights not turning off, and potential battery drain due to lights or electronics staying active.

3. What causes the B1572 code to appear?

Common causes include a faulty door ajar switch, damaged wiring or connectors in the door ajar circuit, or corrosion at the switch or connector terminals.

4. Can code B1572 cause any safety issues?

While not directly a safety issue, the constant door ajar signal may distract the driver or cause the dome lights to stay on, potentially reducing visibility while driving at night.

5. How is the B1572 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the wiring and connectors for damage or corrosion, and test the door ajar switches for proper operation.

6. Can I fix the B1572 code myself?

If you're comfortable with basic electrical troubleshooting, you can inspect and clean the door ajar switch and connectors. However, replacing a faulty switch or repairing damaged wires may require professional assistance.

7. How much does it cost to repair the B1572 code?

The repair cost can range from $50 to $200, depending on whether the issue is a simple wiring repair, connector cleaning, or switch replacement.

8. Can I ignore the B1572 code if the car runs fine?

Ignoring the code can lead to battery drain or further electrical issues, so it's best to address it promptly to avoid inconvenience or additional repairs.

9. Will disconnecting the battery clear the B1572 code?

Disconnecting the battery may temporarily clear the code, but it will return if the underlying issue isnâ€™t resolved.

10. How can I prevent the B1572 code from recurring?

Regularly inspect door seals for moisture, keep door switches clean, and address any signs of corrosion or wiring damage promptly to prevent the code from recurring.