Answer
Aug 14, 2025 - 07:27 PM
Installing a new stereo on a 2009 HHR is actually pretty straightforward when you know your way around it. Here's how it's usually done:
- Disconnect the negative battery cable to avoid electrical or airbag issues.
- Remove the dash trim bezel around the radio using a plastic trim tool. Start at the edges and work around until it pops free.
- Unscrew and slide out the factory stereo. Unplug the wiring harness and antenna cable.
- Prepare the new stereo harness by matching and connecting each wire to the aftermarket harness (power, ground, speakers, etc.). Use crimp connectors or solder and heat-shrink.
- If needed, connect a data-bus/chime interface (retains door chimes, OnStar, and steering wheel controls). Follow the interface’s wiring diagram.
- Mount the new stereo in a dash kit that fits the HHR’s opening.
- Plug in the harness, interface, and antenna adapter to the new stereo.
- Install the stereo assembly into the dash and secure it with the factory screws.
- Reconnect the battery and test all functions — power, sound, chimes, steering wheel controls, etc.
- Reinstall the dash trim bezel once everything works.
Of course, if you want the exact HHR-specific dash removal steps, connector pinouts, and wiring diagrams with photos, this 2009 Chevrolet HHR Service & Repair Manual Software has the full step-by-step with clear images and exploded views. I recommend grabbing it if you want to do this properly, but DIY style 😉✌🏻
