'98 Suburban stereo stays on?

[Twin_Flyer]

So my ‘98 ‘Burb (K1500) started a new thing. Walk up to the truck after being parked all night and the factory stereo is playing! Keys still in my hand, haven’t unlocked the doors yet. All factory stock. Have owned the truck since October ‘20 and this just started. Nothing else works that’s not supposed to when the stereo is on. Turning on the wipers shuts the stereo off as well as the power windows on/off switch on the drivers door. Actually any window button will stop the stereo though the windows don’t move (they work fine with the key on). The stereo stays off only as long as I hold the button. This sounds like it’s going to be a PITA to track down!

To make matters worse, it s not all the time though last night it did turn off with the key, but five seconds later it came back on! It was still on when I went to work this morning (I did turn off the stereo to minimize power drain, but the display with the clock stayed on when it is normally off). Just replaced the battery in November.

Accessory circuit via the key switch maybe? That's probably a long shot.

 

[zora]

Do the interior lights work and if so do they also stay on?

 

[Twin_Flyer]

Do the interior lights work and if so do they also stay on?

They do work, on when door open, off when closed.

 

[zora]

You tried that on both doors?

 

[Twin_Flyer]

You tried that on both doors?

all six doors

 

[zora]

When the radio stays on after shutting off and removing key, with the key not fully reinserted will slight movement of the key slot cause the radio to turn off?

 

[Twin_Flyer]

When the radio stays on after shutting off and removing key, with the key not fully reinserted will slight movement of the key slot cause the radio to turn off?

No

 

[Twin_Flyer]

On my home yesterday from grocery shopping, I was thinking what circuits had power full time that might affect the radio and it came to me, the memory circuit

When I got home, i opened the users manual and looked it up. Sure enough, fuse #19, 15A in the dash fuse box is it. Pulled it and sure enough, the radio turned off.

I guess there is a malfunction inside the radio itself. Everything else seems to be working on the truck.

Also seems strange that a memory circuit needs 15 AMPS when most aftermarket radios use a 2 amp fuse but quickly found out that the factory radio does not function at all without that fuse.

Over the weekend I will go over the wiring diagram in the aftermarket service manual I have and see if there is anything else on that line.

Thanks to all for your ideas!