I've had an intermittent fault for a couple of years on my Kenwood DNX516DABS. I've learn to live with it but occasionally (yesterday!) I think I need to take a look at it. It switches itself off before powering back up again. I'm pretty sure it's with vibration, going over a bump etc although this isn't set in stone as some bumps do nothing and others power it down. I can drive for a couple of hours and forget about it or it can cut out several times on a short journey. It's much better on motorways - smoother than patched up/potholed local roads? Note it's powering down, not just losing radio or phone connection, but powering down and restarts after about 20-40 seconds with no input required.
I've had the unit out (while powered up) and checked all the wiring behind the unit, I've shaken the unit vigorously and waggled all the wires but it's stayed on so I'm suspecting the fault isn't something loose internally or at the rear wiring. Not being auto electrics savvy the only other place to check was the fuse box under the gear lever but the fuse looks okay and didn't feel slack, although I've replaced it anyway. The head unit is currently working okay but time will tell and as nothing really has changed I'd be surprised if it's resolved.
One thing that has occurred to me on changing the fuse. When I switched it back on again I had to enter the security code. I never have to do that when it powers down itself. Does that mean that when this is happening I'm not actually losing power to the unit but it's just switching itself off? If it was temporarily losing power (loose connection, ground etc) on going over a bump why don't I have to input the security code when it comes back on again?
I've had the unit out (while powered up) and checked all the wiring behind the unit, I've shaken the unit vigorously and waggled all the wires but it's stayed on so I'm suspecting the fault isn't something loose internally or at the rear wiring. Not being auto electrics savvy the only other place to check was the fuse box under the gear lever but the fuse looks okay and didn't feel slack, although I've replaced it anyway. The head unit is currently working okay but time will tell and as nothing really has changed I'd be surprised if it's resolved.
One thing that has occurred to me on changing the fuse. When I switched it back on again I had to enter the security code. I never have to do that when it powers down itself. Does that mean that when this is happening I'm not actually losing power to the unit but it's just switching itself off? If it was temporarily losing power (loose connection, ground etc) on going over a bump why don't I have to input the security code when it comes back on again?
