AutoCodes – Mercury – B2404 Mercury

B2404 Mercury Code - Audio Steering Wheel Switch Circuit Fault

Quick Answer

Two different steering wheel switch configurations are available, depending on whether the vehicle is equipped with the SYNC system. Common causes include Faulty Audio Steering Wheel Switch, Audio Steering Wheel Switch harness is open or shorted, Audio Steering Wheel 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: B2404 Mercury indicates Audio Steering Wheel Switch Circuit Fault.
Common causes: Common causes include Faulty Audio Steering Wheel Switch, Audio Steering Wheel Switch harness is open or shorted, Audio Steering Wheel 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 826

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 Dec 05, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2404 Mercury Description

Two different steering wheel switch configurations are available, depending on whether the vehicle is equipped with the SYNC system.
On vehicles without the SYNC system, all of the steering wheel control switches are wired to the Audio Control Module (ACM). The steering wheel controls are: VOL+, VOL-, SEEK+, SEEK-, and MEDIA. The SEEK+ and SEEK- switches are represented by arrows.
For vehicles equipped with the SYNC system, the steering wheel controls are: VOL+, VOL-, SEEK+, SEEK-, MEDIA, VOICE, PHONE, and OK. The SEEK+ and SEEK- switches are represented by arrows, the VOICE button is represented by an icon of someone speaking, and the PHONE button is represented by an icon of a phone with an up-and-down arrow. The VOICE, PHONE, and OK switches are wired to the accessory protocol interface module (APIM), while the remaining switches are wired to the ACM.
For all switches, a reference voltage is sent from the appropriate module to the steering wheel controls. When a switch is pressed, the voltage is routed through a specific resistor value for each function. The module provides the ground for the reference voltage. The module uses this reference voltage to determine which control input function has been selected.

OBDII Code B2404 Mercury - Audio Steering Wheel Switch Circuit Fault - AutoCodes.com — B2404 Mercury Code - Audio Steering Wheel Switch Circuit Fault

What does this mean?

What are the Possible Causes of the DTC B2404 Mercury?

Faulty Audio Steering Wheel Switch
Audio Steering Wheel Switch harness is open or shorted
Audio Steering Wheel Switch circuit poor electrical connection

How to Fix the DTC B2404 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 B2404 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 B2404 Mercury Code

1. What are the common symptoms of OBDII code B2404 in a Mercury related to the Audio Steering Wheel Switch Circuit Fault?

The common symptoms include malfunctioning audio controls on the steering wheel, non-responsive volume or track selection buttons, and issues with changing audio sources.

2. What are the possible causes of the B2404 OBDII code in a Mercury?

Possible causes of the B2404 code include a faulty audio steering wheel switch, damaged wiring or connectors in the steering wheel column, or a problem with the audio control module.

3. How can I diagnose the B2404 code in my Mercury?

Diagnosing the B2404 code involves inspecting the wiring and connectors related to the audio steering wheel switch, testing the switch itself for proper functionality, and checking for any loose connections or damaged components.

4. Is it safe to drive my Mercury with the B2404 code present?

While it may be safe to drive your Mercury with the B2404 code, it is recommended to address the issue promptly to avoid any inconvenience or potential safety hazards associated with the malfunctioning audio controls.

5. Can I repair the B2404 code in my Mercury by myself?

Repairing the B2404 code may require some technical knowledge and tools. If you are familiar with automotive electrical systems, you may be able to troubleshoot and fix the issue yourself. Otherwise, it is advisable to seek professional help.

6. How much does it typically cost to fix the B2404 code in a Mercury?

The cost of fixing the B2404 code can vary depending on the exact cause of the issue. Simple repairs like fixing loose connections may be relatively inexpensive, while replacing a faulty audio steering wheel switch or module could cost more.

7. Will resetting the OBDII code clear the B2404 fault in my Mercury?

Resetting the OBDII code may temporarily clear the fault, but if the underlying issue causing the B2404 code is not addressed, it is likely to reappear. It is important to diagnose and fix the root cause of the problem.

8. How long does it take to repair the B2404 code in a Mercury?

The time needed to repair the B2404 code can vary based on the complexity of the issue and the availability of parts. Simple fixes may take a short amount of time, while more involved repairs could require several hours or more.

9. Can the B2404 code in my Mercury cause any other problems besides audio control issues?

While the B2404 code primarily relates to the audio steering wheel switch circuit fault, unresolved electrical issues in the steering wheel column could potentially lead to other problems with the vehicle's electrical system.

10. Is the B2404 code a common issue in Mercury vehicles?

The B2404 code related to the Audio Steering Wheel Switch Circuit Fault is not extremely common in Mercury vehicles, but it can occur due to wear and tear on components or electrical faults. Regular maintenance and prompt repairs can help prevent this issue.