This happened right after a new battery was installed on my 2007 EX model. I got some assistance fromthe Honda dealership technician to resolve the issue.
1. Turn off the engine and place the key in Radio position and turn off the radio.
2. While pressing #1 and #6 at the same time,turn on the radio now.
3. You will see a sequence of digits displayed on the screen that you need to read it to the technician.
4. Now you will see the radio displays 'CODE'.
4. In turn, he will ask you to punch in a different set of digits to unlock the radio.
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If you have already tried to enter a code many times, and it doesn't work, do the following: 1. Disconnect the battery, 2. Connect the battery, 3. Put Radio ON 4. Enter the radio code of 4 digits, 5. That's all. If you don't have the radio code of your Honda Odyssey, have on hand its VIN, and ask your former salesperson or your former dealer.
First you need the code to enter. Check your owner's information for a business card with Anti-Theft Radio Identification Card at the top. There is a 5 digit code. Enter that using the number keys of your radio when you see "Code" on the digital screen of the stereo. If you don't have the code, you need to get it from a Honda dealership. You will need the system's serial number to get this.
get the code
You have to go to a Honda dealer and they will give you the code.
Open the trunk and check to see if the code is on the underside of the trunk lid. (That is where I find the code to my Honda Accord) If you do not have the code click the link, sign up at the Honda Owner's Link, and then click get radio code.