How to Install a Hidden Dash Cam?
4 Answers
Hidden dash cams require professional installation. Typically, these dash cams are installed at the top of the interior rearview mirror, with the camera attached to the front windshield. Due to the complexity of installation, it is not recommended for car owners to install it themselves. Hidden dash cams offer a sleek appearance without messy wiring, but the installation process is more complicated and should be done at a 4S shop or professional service center. Many car brands now come with factory-installed hidden dash cams, which are usually integrated with the interior rearview mirror.
Last time I spent three hours in the garage installing the dash cam, now sharing some tips: The key is to buy a matching voltage reducer cable. Simply pry open the fuse box on the left side of the driver's seat and locate the 15A cigarette lighter fuse (commonly at F37 position). Remember to disconnect the negative battery terminal first! Use a fuse tap to connect the red wire of the voltage reducer in parallel, then reinsert the fuse. The black ground wire should be attached to a screw after sanding the contact surface. Slowly peel open the A-pillar trim to hide the wires, being careful to avoid the airbag wiring harness. Finally, stick the dash cam on the dotted black area of the windshield behind the rearview mirror. The most challenging part was threading the wire through the headliner gap—I used a plastic pry tool to carefully tuck it in bit by bit. Remember to wear cotton gloves throughout to avoid scratching the interior.
DIY installation is actually not difficult, even someone as clumsy as me managed it. The key is to purchase a USB adapter to draw power from the dome light and use a suction cup to secure the position without obstructing the view. When prying open the dome light cover, be bold yet careful—just locate the ACC positive and ground wires to connect them properly. Tuck the wiring along the top edge of the windshield into the rubber seal for a completely hidden setup. Important reminder: For rearview mirror bracket-style dash cams, test the angle to avoid capturing hood reflections, as high beams at night may cause overexposure. It’s best to have some automotive-grade 3M adhesive and static cling film on hand as backups, as they hold more securely than suction cups in rainy conditions.
I recommend the method guided by the mobile app: choose the voltage reduction cable kit to connect to the ACC power source, and use the phone to connect to the dashcam's WiFi for angle adjustment. When routing the hidden wire, remove three screws from the steering column trim panel, tuck the wire into the dashboard gap, and then pass it under the floor mat. Note that for luxury cars like Audi, an anti-leakage module must be installed to prevent draining the battery. The installation position should be at least 5cm below the black border of the windshield, otherwise, it may fail the annual inspection. During testing, remember to record for 30 seconds with your phone to check for severe reflections, and avoid positions prone to fogging on rainy or foggy days.
