AutoCodes – Generic – B1572

B1572 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 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.

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Code Popularity 10,667

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

What does this mean?

What are the Possible Causes of the DTC B1572?

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?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

B1572 Ford — Door Ajar Left Right Switch Circuit Open
B1572 Lexus — Telephone Microphone Error
B1572 Lincoln — Door Ajar Left Right Switch Circuit Open
B1572 Mercury — Door Ajar Left Right Switch Circuit Open
B1572 Toyota — Telephone Microphone Error

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 Code

1. What are the common symptoms of OBDII code B1572, Door Ajar Left Right Switch Circuit Open?

- The common symptoms include inaccurate door ajar warnings on the dashboard, interior lights staying on when doors are closed, and potential issues with power door locks.

2. What can cause the OBDII code B1572 to trigger?

- The code B1572 is typically triggered by a malfunction in the left or right door switch circuit, which can be caused by damaged wiring, a faulty door switch, or a loose connection.

3. How can I diagnose the cause of OBDII code B1572 related to the door ajar switch circuit?

- To diagnose the issue, you can visually inspect the wiring harness for any damage, test the door switches for proper functionality, and use a multimeter to check for continuity in the circuit.

4. Are there any quick fixes I can try to resolve the Door Ajar Left Right Switch Circuit Open issue?

- You can try spraying electrical contact cleaner on the door switches to remove any dirt or debris that may be causing a poor connection. Also, checking and securing any loose wiring connections may help resolve the issue.

5. Can I continue driving my vehicle with the OBDII code B1572 active?

- While the code B1572 may not directly affect the drivability of the vehicle, it is essential to address the issue promptly to prevent potential electrical problems or draining the battery due to lights staying on.

6. Should I replace the door switches if I encounter the OBDII code B1572?

- If the door switches are found to be faulty during diagnosis, replacing them with new ones is recommended to solve the Door Ajar Left Right Switch Circuit Open issue.

7. Is it possible to reset the OBDII code B1572 without repairing the underlying issue?

- While clearing the code can be done using an OBDII scanner, it is crucial to address the root cause of the problem to prevent the code from reoccurring.

8. What are the potential risks of ignoring the OBDII code B1572 related to the door ajar switch circuit?

- Ignoring the code can lead to continued issues with interior lights staying on, potential drainage of the vehicle's battery, and the risk of malfunctioning power door locks.

9. Can severe weather conditions impact the Door Ajar Left Right Switch Circuit Open issue?

- Extreme temperatures or moisture can exacerbate the problem by causing electrical connections to corrode or malfunction, making it important to address the issue promptly.

10. Is it possible to prevent the OBDII code B1572 from occurring in the future?

- Regularly checking and maintaining the door switches, wiring harness, and connections can help prevent the recurrence of the Door Ajar Left Right Switch Circuit Open issue.