AutoCodes – Mercury – B131A Mercury

B131A Mercury Code - Delayed Accessory Power Circuit Short

Quick Answer

The Accessory Delay Relay is located in the Body Control Module (BCM). Common causes include Faulty Accessory Delay Relay, Accessory Delay Relay harness is open or shorted, Accessory Delay Relay 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: B131A Mercury indicates Delayed Accessory Power Circuit Short.
Common causes: Common causes include Faulty Accessory Delay Relay, Accessory Delay Relay harness is open or shorted, Accessory Delay Relay 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 895

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 Nov 29, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B131A Mercury Description

The Accessory Delay Relay is located in the Body Control Module (BCM). When the ignition is turned ON, the BCM activates the accessory delay relay by grounding the relay coil. When the ignition is turned to the OFF position, the BCM continues to ground the accessory delay relay coil for approximately 10 minutes, or until a front door is opened. When the accessory delay relay is active, it supplies voltage to the power window system. The OBDII sets when the BCM senses an open, short to voltage or short to ground on the accessory delay relay control circuit.

OBDII Code B131A Mercury - Delayed Accessory Power Circuit Short - AutoCodes.com — B131A Mercury Code - Delayed Accessory Power Circuit Short

What does this mean?

What are the Possible Causes of the DTC B131A Mercury?

Faulty Accessory Delay Relay
Accessory Delay Relay harness is open or shorted
Accessory Delay Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B131A 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 does this mean?

Code Tech Notes

B131A:12 Delayed Accessory Power Circuit Short To Battery
B131A:14 Delayed Accessory Power Circuit Short To Ground or Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B131A 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.

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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 B131A Mercury Code

1. What are the common symptoms of OBDII code B131A in a Mercury related to the Delayed Accessory Power Circuit Short?

The common symptoms include issues with the vehicle's accessory power features, such as delayed operation or complete failure of power windows, radio, or interior lights.

2. What are the possible causes of the Delayed Accessory Power Circuit Short (OBDII code B131A) in a Mercury?

Possible causes may include wiring harness issues, a faulty accessory power relay, a short circuit in the power distribution system, or a malfunctioning control module.

3. How can I diagnose the Delayed Accessory Power Circuit Short in my Mercury triggering OBDII code B131A?

To diagnose this issue, you may need to perform a thorough inspection of the wiring, test the accessory power relay, check for any visible signs of a short circuit, and use a multimeter to test the components in the power distribution system.

4. Can I continue driving my Mercury with the B131A OBDII code related to the Delayed Accessory Power Circuit Short?

While it may be possible to continue driving the vehicle with this code, it is recommended to address the issue promptly to prevent further electrical problems and ensure the proper functioning of the accessory power features.

5. How can I repair the Delayed Accessory Power Circuit Short issue causing OBDII code B131A in my Mercury?

Repairing this issue may involve repairing or replacing damaged wiring, replacing a faulty accessory power relay, addressing any short circuits in the system, or reprogramming the control module if necessary.

6. Will resetting the OBDII code B131A related to the Delayed Accessory Power Circuit Short in my Mercury solve the underlying issue?

Resetting the code may temporarily remove the warning light, but it will not fix the root cause of the problem. It is essential to diagnose and repair the underlying issue to prevent the code from reoccurring.

7. Are there any specific models or years of Mercury vehicles more prone to experiencing the Delayed Accessory Power Circuit Short issue triggering OBDII code B131A?

The Delayed Accessory Power Circuit Short issue can potentially occur in various Mercury models and years, so it is important to address the problem based on the specific symptoms and diagnostic findings in your vehicle.

8. Can extreme weather conditions or water exposure contribute to the Delayed Accessory Power Circuit Short problem in a Mercury?

Yes, extreme weather conditions or water exposure can lead to corrosion, wiring damage, or short circuits in the accessory power system, potentially causing the Delayed Accessory Power Circuit Short issue and triggering OBDII code B131A.

9. How much can I expect to pay for professional repairs related to the B131A OBDII code and the Delayed Accessory Power Circuit Short in my Mercury?

The cost of repairs can vary depending on the specific cause of the issue, the extent of the damage, and labor rates in your area. It is advisable to obtain quotes from reputable automotive technicians or repair shops for an accurate estimate.

10. Is it possible to prevent the Delayed Accessory Power Circuit Short issue triggering OBDII code B131A in my Mercury through regular maintenance?

While some instances of this issue may be unavoidable, regular inspection and maintenance of the electrical system in your Mercury can help prevent potential wiring issues, relay failures, or other problems that could lead to the Delayed Accessory Power Circuit Short.