An aftermarket Android head unit can greatly enhance your car’s audio experience, but installation isn’t always smooth sailing. One common issue is encountering no sound after installation. This guide provides troubleshooting steps and solutions for when your Android head unit has no sound.
Common Causes of No Sound and Their Solutions
Several factors can contribute to a silent Android head unit. Let’s explore the most frequent culprits:
1. Faulty Wiring and Connections
Problem: Loose or incorrectly crimped wiring connections are the most common cause of audio issues. Poor connections can interrupt the signal path, leading to no sound. This often occurs when using a new wiring harness, particularly one with more pins than the factory harness.
Solution:
- Double-check all connections: Meticulously inspect every wire connection, ensuring they are securely crimped and properly seated in the corresponding pins. Pay close attention to speaker connections, power connections, and ground connections.
- Use a wiring diagram: Refer to the wiring diagram for your specific head unit and vehicle to ensure correct wiring.
- Test with a multimeter: If you suspect a specific wire is faulty, use a multimeter to check for continuity and ensure the signal is passing through.
2. Incorrect Steering Wheel Control (SWC) Wiring
Problem: While not directly related to sound, incorrect SWC wiring can sometimes interfere with the head unit’s operation, potentially affecting audio output. This often happens when connecting the SWC wires to the wrong keys on the head unit harness.
Solution:
- Consult the head unit manual: Carefully review the wiring diagram in your head unit’s manual for the correct SWC connections.
- Key 1 for SWC, Key 2 for Bluetooth: Typically, Key 1 on the harness is designated for SWC, while Key 2 is for the Bluetooth module.
- Ground the negative SWC wire: Ensure the negative SWC wire is connected to a proper ground connection, not to Key 2.
3. Hissing or Buzzing Noise – Using a Line Output Converter (LOC)
Problem: A factory amplifier often requires a low-level input signal. An Android head unit typically outputs a high-level signal, causing a mismatch and resulting in hissing, buzzing, or humming noise.
Solution:
- Install a Line Output Converter (LOC): An LOC converts the high-level signal from the head unit to a low-level signal compatible with the factory amplifier. Use a quality LOC with enough channels for your system (e.g., a 4-channel LOC for a system with four speakers).
- Experiment with different LOCs: Different LOCs can produce varying results. If one LOC doesn’t eliminate the noise completely, try a different brand or model.
4. Dash Cam Interference
Problem: While less common, a malfunctioning or improperly connected dash cam can sometimes interfere with the head unit’s operation, potentially impacting audio. This can be due to power issues or faulty USB connections.
Solution:
- Direct connection: Connect the dash cam directly to the head unit’s USB port without using an extension cable. Extension cables can sometimes cause voltage drops, leading to camera malfunctions and potential interference.
- Test with a different USB port: If possible, try connecting the dash cam to a different USB port on the head unit.
- Disconnect the Dash Cam: Temporarily disconnect the dash cam to rule out any interference.
Choosing the Right Android Head Unit
Selecting a high-quality head unit with sufficient processing power and RAM can minimize potential issues. Opting for a top-tier model often provides a smoother user experience and better compatibility with various accessories.
Addressing Factory Amplifier Compatibility
If your vehicle has a factory amplifier, understanding its compatibility with your new head unit is crucial. Research whether your amplifier accepts high-level or low-level inputs. Using LOCs can often resolve compatibility issues with factory amplifiers.
Conclusion
Troubleshooting “Android Head Unit No Sound” issues often involves careful examination of wiring, proper use of LOCs if needed, and ensuring compatibility with your vehicle’s existing audio system. By systematically addressing these potential causes, you can enjoy the full audio potential of your new Android head unit.
