I have an SI-538 shower companion cd player/fm radio. It works with the adapter plugged in, but it won't run on batteries all of a sudden, even if they are brand new and the correct voltage. What could be wrong? Can I connect the adapter to the unit and still play it in the shower (I think the answer to that is "no.")

t sounds like the CD function may be disabled or the CD port may not be connected properly to the radio unit. Here are a few troubleshooting steps you can try:

1. Check the connections: Make sure the Bluetooth adapter is securely connected to the CD port on the rear of the OEM radio. Check for any loose wires or connections, and ensure that the adapter is compatible with your radio.
2. Check the fuse: There may be a fuse for the CD player that needs to be replaced. Check your owner's manual to locate the fuse box and CD player fuse, and replace it if necessary.
3. Reset the radio: Try resetting the radio by disconnecting the battery for a few minutes. This can sometimes help to clear any errors or issues with the radio's settings.
4. Try a different CD: If you have a CD available, try inserting it into the CD player to see if it works. If the CD player still doesn't work, then there may be an issue with the CD player itself.

If none of these steps work, then it may be best to take your car to a professional to have the radio unit inspected and repaired.

Your CD may not be music CD. Some car radio doesn't accept MP3 or WMV files. Change it to a good radio such as JVC car radio.

That sounds like an earth fault. If you can add a temporary additional earth and see if that cures it over period of time.

Install batteries in your unit to see if it will work, if yes then is is more than likely a fuse or a power transformer is open.

Remove the batteries, clean the battery terminals with rubbing alcohol and Q-Tips and replace the batteries with new ones, if no! I would suggest you have someone look at it, usually find bad solder connections that need touch up.

Do not turn the radio on. Then depress the "mode" button and yo will see all the questions, including time, date, etc. to respond to. Either channel + or - or Tuning + or - (I don;t recall which), will get you the numbers you need, pressing "mode" again will get you to the next module or out entirely.

Your best bet on that one is to go to a place that sells car audio systems or even some autoparts retailers have them,and get the proper adapter harness already made up. A few more dollars but, a whole lot less headaches.

hello. tjl001 
you should look the socket ac plug and try to plug in and plug out ,the socket maybe crack or the 
spring not work. I hope this can fix you trouble.

I had exactly the same problem. Here is how I resolved it. 1. There is a reset button inside the battery compartment, in the center, between the C cells. Try pushing it with a paper clip or similar item. 2. If that doesn't work, replace the C cells. 3. If that doesn't work, try replacing the lithium backup battery. It is located between the C cells, in a compartment with an arrow. 4. I finally did all three at the same time, replacing the C cells, lithium battery, and resetting the system. The radio has worked fine for two days now. Good luck.

Separate product - listening to mp3's through your car radio is the most complicated and most expensive option; cheapest is a casette adapter if your car has a casette player, or a cd adapter for cd player - one end will plug into headphone jack of Sansa player. Best Buy has the widest selection of adapters. I would get the type of adapter that plugs into the headset - wired. Wireless adapters are "neat," but unreliable (and expensive).

-Tha Mp3 Doctor