Have you simply run the cable for the dash cam or did you connect it to the cars wiring harness to get power on at ignition/start? You have to be very careful when connecting to modern systems as they run what is called a CAN (Controller Area Network) bus. Signals pass over this bus from the computers (commonly called ECU's or electronic control units) of the car to relays and starters closer to the actual system which turn them on and off. The bus usually ends at a relay or controller that, once a valid data packet signal is received, activates a relay which passes power to the system like when you turn on the lights. The advantage of the CAN bus is that multiple systems can communicate at once and a priority is observed by all systems on that bus. It saves having to run power over multiple parts of the harness when a single power circuit feeds all the relays. Mind you this a very simplified explanation. You can check sites like Wikipedia for greater detail.Hi, have just fitted an in-line cable for dashcam and now have no power/ignition. Button flashes but no ignition,radio,central locking. I have checked all fuses but don’t know if it could be a relay or where to start.
Do you know which wire you cut in the harness? Where was the wire leading to? Which switch?Also, the cable I spliced had 12v showing on my voltmeter before I joined it to the dashcam, now there is no voltage. This is why I think it is a blown fuse or relay?
You've dodged a bullet my friend. Glad to hear you've had a satisfactory result. I would be getting the service staff to check the history of the systems the next service to see if there are any unresolved issues which remain in the system. They should do this as a normal step during a service but best to be on the safe side.Problem solved. Turned out to be a 30A fuse in engine bay fuse box, location fuse No 22 IOD? No idea what IOD is but it obviously must be something important LOL. Thanks to Zarbs for the knowledge and links, you're a star. Lesson learnt.