Yes, you can use an IR blaster with a car head unit, but its practicality is limited to specific, older scenarios. An IR (Infrared) blaster is a device that relays signals from a remote control to equipment hidden out of direct line-of-sight. Its primary use in a car would be for an aftermarket head unit that controls an aftermarket CD changer or TV tuner from the early 2000s, which relied on IR remotes. For modern vehicles, this technology is largely obsolete.
How an IR Blaster Works in a Car
The concept is simple: you place the IR blaster's emitter directly over the IR receiver window of the device you want to control (like that old CD changer in the trunk). The blaster is connected to your head unit via a wire. When you press a button on the head unit, it sends an electrical signal to the IR blaster, which then converts it into the corresponding infrared light signal, mimicking the original remote control.
Compatibility with Modern Systems
This is the main challenge. Most factory-installed (OEM) head units and modern aftermarket units from the last decade use different, more advanced communication protocols. They typically connect to amplifiers, satellite radio receivers, and other components via dedicated data buses (like CAN Bus), analog audio cables, or digital connections (like HDMI or USB). These systems do not use infrared signals for control, so an IR blaster would be incompatible.
Modern Alternatives to an IR Blaster
If your goal is to control a device (like a smartphone for music playback) from your head unit, you have much better options. The standard today is a direct wired connection like USB, which allows for both charging and full control via the head unit's touchscreen or steering wheel buttons. Wireless protocols like Bluetooth are even more common for audio streaming and hands-free calling, offering greater convenience without any line-of-sight limitations.
| Connection Method | Typical Use Case | Control Capability | Line-of-Sight Required? |
|---|
| IR Blaster | Controlling legacy add-ons (2000s-era CD changers) | Basic playback functions | Yes |
| Bluetooth | Wireless audio streaming, hands-free calling | Full playback, track skip, volume | No |
| USB Connection | Wired audio playback, smartphone integration (Apple CarPlay/Android Auto) | Full device control on head unit screen | No |
| Auxiliary (AUX) Input | Basic analog audio input from any device | Play/Pause only (on device itself) | No |
| Steering Wheel Controls | Interacting with head unit | Volume, track skip, voice assistant | No |
In short, while an IR blaster can be used with certain older aftermarket head units, it's a niche solution. For any modern car audio need, focus on Bluetooth, USB, or integrated smartphone solutions for a seamless experience.
