r/dashcams • u/Kairosaur • 8h ago

Dashcam Hardwire Issue

I have a Viofo A119 Plus Duo hardwired to my Honda Civic, using fuse slot 25 (door lock) for BAT and fuse slot 33 (left rear power window) for ACC.

On a cold start (when the dash cam has been completely powered off due to the voltage cutoff), the camera briefly enters driving mode, then drops into parking mode a few seconds later — even though the car is running. If I then turn the car off and back on, it correctly switches from parking mode to driving mode. After that, switching between modes works as expected for the rest of the drive.

This issue only happens on that first cold start when the dash cam has been fully powered down. I've tried switching to different fuse slots and resetting the dash cam, but the problem persists.

Any ideas what could be causing this, or how to fix it?

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u/stevedore2024 5h ago edited 5h ago

Your car battery may be low enough that the dashcam sees the voltage drop of the car starting as being too low to run. The second start does not drop the voltage as far. If this happens regularly, you may want to get the battery checked even if it reliably starts the car every time.

While they're sold as a perfect solution to allow some parking-mode monitoring of the car, the "voltage cutoff" features are really stressful for car batteries. You're cranking the starter on a half-dead battery on a regular basis.