Not needed now but where can I find radio codes? I don't find in paperwork received from dealer. Also, can't find find anywhere in the car like sticker.

 

I don't know why Acura (at least in the US) still displays "Please Enter Radio Code" if the battery has been disconnected. I'm not sure what year they stopped using it but my 99 Prelude & 03 Accord Coupe both came with Radio Code cards.

However I had the issue when I installed a new steering wheel & when I turned it back on after reconnecting the battery I got the message "Enter Radio Code" looked all over the car for it, Googled it & said to go to the Acura Owners website to enter the Vin # & I would get a code.

Then I decided to look else where because I didn't want to wait the 24 hours to get the code & found a site that in the 19 RDX there is no radio code & if the message appears to press & hold the Audio Power Button for 5 seconds to clear the Audio Code message.

I even asked the service department if this is how you deal with the Radio Code if it pops up & they confirmed the method of pressing & holding the audio button for 5 seconds is the the Radio Code.

Hope that helps you out.

 

This is from page 242 of my 2020 Owners Manual.

It sounds like, when you push and hold the power button on the audio system, the unit compares it's internal code with the code stored in one of the vehicles control units (probably the engine control unit). If the codes match, the unit knows that it is connected to the original vehicle, and unlocks itself,

There must be a way to enter a code manually should you ever decide to sell your audio system to another RDX owner, but I have never found the answer to that problem.

 

Thank you - much appreciate.