Radio/CD suddenly dead

[CTScott]

The dimmer fuse is just for saving the radio station memory when power is off. The ACC fuse powers the main functions.

[bobolinko]

Originally Posted by CTScott

The dimmer fuse is just for saving the radio station memory when power is off. The ACC fuse powers the main functions.

Hi CT,
I have a question to that end...
My Scion XD stereo looses all the presets when the battery is removed, but remembers EVERYTHING when I disconnect the power cable (battery power still live) from the unit and remove the head unit and store it, even for a year or more... What's the goings on here?

I cannot understand why this happens, but it does. Did it more than once, and on more than one car.

Thanks!

[CTScott]

Originally Posted by bobolinko

Hi CT,
I have a question to that end...
My Scion XD stereo looses all the presets when the battery is removed, but remembers EVERYTHING when I disconnect the power cable (battery power still live) from the unit and remove the head unit and store it, even for a year or more... What's the goings on here?

I cannot understand why this happens, but it does. Did it more than once, and on more than one car.

Thanks!

At first I was thinking you are nuts, but then I realized that the radio probably has a super cap for memory backup. When you remove the radio it keeps the CMOS alive for a long time, but when you leave it in circuit, it tries to power the rest of the car when you pull the battery cable. Put a general purpose diode (1N4001, etc) in line with the constant battery power wire, with the white line facing towards the radio. That will prevent it from back feeding the rest of the car.

[bobolinko]

Originally Posted by CTScott

At first I was thinking you are nuts, but then I realized that the radio probably has a super cap for memory backup. When you remove the radio it keeps the CMOS alive for a long time, but when you leave it in circuit, it tries to power the rest of the car when you pull the battery cable. Put a general purpose diode (1N4001, etc) in line with the constant battery power wire, with the white line facing towards the radio. That will prevent it from back feeding the rest of the car.

Thanks CT.
I, too thought I was "losing it" so I had to do it 3 times and sure enough, each time the results were the same. I was thinking about the diode, but have not had the motivation to getting into the dash again. It just might be the same with the Yaris radios too...

[CTScott]

Originally Posted by bobolinko

Thanks CT.
I, too thought I was "losing it" so I had to do it 3 times and sure enough, each time the results were the same. I was thinking about the diode, but have not had the motivation to getting into the dash again. It just might be the same with the Yaris radios too...

No. The Yaris ones lose it instantly either way, which would lead me to believe that the Scion harness or fuse panel has the diode integrated.