2015 Infiniti Q50 AV Control Unit: Fixing the 'Audio Off' Problem
This guide explains common failures, replacement procedures, and programming needs for the 2015 Infiniti Q50's infotainment control module, often misidentified as the BCM.
- This part (25915-4HB3A) is the AV Control Unit for the infotainment screen, NOT the Body Control Module (BCM).
- The most common failure symptom is the 'Audio Off' message, resulting in a total loss of sound.
- Replacement units MUST be programmed/configured to the vehicle's specific options using a dealer-level scan tool (CONSULT-III plus).
- Compatibility is critical: the unit is for 2015 Q50s with 3.5L/3.7L engines, navigation, and a production date on or before 12/31/2014.
Is it an AV Control Unit or a Body Control Module?
There is significant confusion about this part. The part number 25915-4HB3A is for the AV Control Unit, which is the brain for the upper navigation and information screen. It is NOT the Body Control Module (BCM). The BCM is a completely different part with a separate part number (like 284B1-4HB0E) located in the passenger-side kick panel. 🎬 Watch: How to locate and replace the BCM module The BCM handles functions like interior/exterior lights, power locks, and the security system. If you are experiencing issues with the infotainment screen, such as the 'Audio Off' message, the AV Control Unit is the likely culprit, not the BCM.
Warning: This AV Control Unit, part number 25915-4HB3A, is specifically for 2015 Infiniti Q50 models with a 3.5L Hybrid or 3.7L engine, factory navigation, and a production date on or before December 31, 2014. Always verify your vehicle's production date and specifications before ordering.
Known Issues and Symptoms of Failure
The AV Control Unit in the 2015 Q50 is known for several common problems, many of which are software-related or due to internal hardware failure.
1. 'Audio Off' Message
The most prevalent symptom is a persistent 'Audio Off' message on the upper display. This results in a complete loss of sound from all sources, including the radio, Bluetooth, and navigation guidance. The volume knob may become unresponsive. In the system's self-diagnostic menu, this may show as a communication error between the DCU (Display Control Unit) and the head unit. 🎬 See a demonstration of common Audio Off and DCU issues While sometimes a hard reset (disconnecting the battery for 15-20 minutes) can temporarily resolve it, it often indicates a failing AV Control Unit.
2. Frozen or Black Upper Screen
The upper screen may freeze, become unresponsive to touch, or fail to power on, displaying only a black screen. This prevents access to navigation, vehicle settings, and other essential functions managed by the unit. This was a common complaint on early Q50 models, and Infiniti issued several software updates to address these stability issues.
3. Random System Reboots or Glitches
The InTouch system may randomly reboot, or certain features like drive mode selection or steering wheel controls may stop working intermittently. These electrical gremlins can sometimes be traced back to a fault within the AV Control Unit. Liquid spills in the center console area are a known cause of damage to this module.
Buying a Used AV Control Unit
Given that a new AV Control Unit from Infiniti can cost over $4,000, a used OEM unit is a popular and cost-effective alternative. Here’s what to look for:
- Verify the Part Number: The most critical step. Ensure the part number on the used unit exactly matches your original. For this guide, the number is 25915-4HB3A. There are other similar-looking units, but they are not interchangeable.
- Check Compatibility: Confirm the donor vehicle had the same engine, navigation system, and production date range as your Q50. Mismatched units may not configure correctly.
- Inspect for Damage: Look for any signs of physical damage, especially around the connectors. Since these units are located in the dash, they are generally protected, but check for any evidence of liquid spills from the area above.
- Seller Reputation: Purchase from a reputable seller who tests their parts and offers a warranty. This gives you recourse if the unit is dead on arrival.
Programming and Installation
Replacing the AV Control Unit is more complex than a simple swap.
Pro Tip: Before removing your old unit, if it is at all functional, enter the secret diagnostic menu to record your vehicle's current configuration settings. This will be invaluable for setting up the replacement unit.
Does it need to be programmed?
Yes, configuration is required. According to Infiniti's technical service bulletin (ITB13-026i), when the Display Control Unit (DCU) is replaced, the new unit must be configured to the vehicle's specific options. This is done using the Infiniti CONSULT-III plus diagnostic tool. The process involves reading the configuration from the old unit (if possible) and writing it to the new one. If the old unit is dead, the configuration must be entered manually based on the vehicle's features. The replacement DCU may also need to be registered for InTouch Apps to function.
Can an independent shop do it?
A well-equipped independent shop that specializes in Nissan/Infiniti and owns a legitimate CONSULT-III plus tool can perform the configuration. However, many shops do not have this capability, meaning a dealer visit may be necessary after installation. A standard OBD-II scanner cannot perform this function.
Cost of Replacement
| Part/Service | Estimated Cost |
|---|---|
| New OEM AV Control Unit | $4,500 - $4,700 |
| Used OEM AV Control Unit | $150 - $400 (eBay, salvage yards) |
| Shop Labor (Installation) | $200 - $350 (1.5-2.5 hours) |
| Dealer Programming/Configuration | $150 - $300 |
Frequently Asked Questions (FAQ)
My screen says 'Audio Off'. Do I have to replace the whole unit?
Not always, but it's the most common fix. First, try a hard reset by disconnecting the car's battery for at least 20 minutes. This can sometimes clear software glitches. If the problem returns, it likely points to an internal failure in the AV Control Unit, and replacement is the next step.
What's the difference between the AV Control Unit and the Body Control Module (BCM)?
The AV Control Unit (25915-4HB3A) runs the upper infotainment screen, navigation, and audio. The BCM (e.g., 284B1-4HB0E) is a separate computer that controls body functions like lights, windows, locks, and the alarm. They are located in different parts of the car and are not interchangeable.
Can I install a used AV Control Unit myself?
Yes, the physical installation is feasible for a DIYer with moderate experience. It involves removing the center console trim and shifter surround 🎬 Watch: Step-by-step DIY guide to removing the center console to access the unit in the dash. However, you will likely need to visit a dealer or specialized shop afterward to have the replacement unit professionally configured to your car's options.
Will a used unit from any 2015 Q50 work?
No. Fitment is very specific. The replacement unit must come from a vehicle with the same engine (3.5L Hybrid or 3.7L), factory navigation, and a production date on or before 12/31/2014. Using a unit from a car with different options will likely result in configuration problems.
Helpful Videos
Technical Specifications
OEM Part Numbers: 25915-4HB3A
Controls the upper display of the Infiniti InTouch system. Requires vehicle-specific configuration upon installation.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Infiniti Q50:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is it an AV Control Unit or a Body Control Module?
- Known Issues and Symptoms of Failure
- 1. 'Audio Off' Message
- 2. Frozen or Black Upper Screen
- 3. Random System Reboots or Glitches
- Buying a Used AV Control Unit
- Programming and Installation
- Does it need to be programmed?
- Can an independent shop do it?
- Cost of Replacement
- Frequently Asked Questions (FAQ)
- 🎟️ Get 5% Off