Red flashing light radio 2005 uplander what does it mean

Question edited for clarity and all the typos.
Question moved to sub category.

Did you disconnect the battery recently? It could be many things, but it could be the security system immobilizer. You should also check for fault codes. When you say 'nothing works inside', do you mean things like the dome light, the radio, and the dash lights? If that is the case, you need a mobile auto electrician.

https://www.google.com/search?q=2005+chevy+uplander+security+reset

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use a scanner to reset the ECM and immobilizer

Instrument cluster repair or replace . 2003 to 2006 GM had faulty stepper motor's in the instrument cluster . Radio is also probably no good . Checking power an ground connection's for the radio an hooking up a scanner
Battery positive voltage is provided to the radio from RADIO AMP fuse in the fuse block - right instrument panel (I/P). The radio is grounded to G201. The radio is enabled/disabled by class 2 messages from the body control module (BCM). The BCM also allows for retained accessory power which allows the radio to operate for up to 10 minutes after the ignition is turned off. The radio can only be deactivated by one of the following conditions:

How to repair GM Instrument Cluster Speedometer Gauge Stepper

You probably turned it off. Most General Motors cars have the setting to turn off or on through the radio control panel Find the configure button on the radio control and scroll through till you find the parking assist page and then reset to on. check with your manuel seeing there are different radio controls depending on options.

If there is no port on the front of the radio, your vehicle does not have the option for an aux port.

could be loose plug to radio ,loose fuse loose antenna If you are gettin power to the radio plug all the time with the key on it's the radio, you can pick one up cheap out of a wreck

may be a check engine light?

The Radio is a True Statement. It will need a Lockout Code installed to bypass the Theft Deterent. On the Remote, The light will still flash But, It could still need a Battery anyway if the Battery has just enough Power to Turn the Light on and not Enough to send the Code to the Vehicle to Perform the Desired Actions.

This is Simply the Computer System Letting you know that there has been an Unusual Action. If it was a Mechanical Problem it would stay on Constant and Flash Periodically.

I have a 2005 with DVD - but do not have the wireless headphones. I use the AUX button on the front radio to switch between FM/AM/and the DVD Player. I do have headphones jacks in the roof console by the DVD player, but have never used them.