Question about Pioneer DEH-1900MP CD Player

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Error Message AO

The unit will not allow me to play or eject a cd the message error AO is displayed on the display

its says error-Ao

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  • kiki2687 Apr 09, 2008

    My player is doing the samething. error message ao

  • notoriusbug Aug 14, 2008

    Same problem - I'll give the harness thing a try tonight

  • evbrad2002 Aug 17, 2008

    Same problem. error-ao message after my battery died from leaving lights on. Jumped the car off and then the error message. Unplugging the harness for an hour+ did the trick! BTW, I also called Pioneer customer service and this was their suggestion also. I didn't have the removal keys so I had to go to the Best Buy that installed it to have the head unit pulled so I could disconnect the harness. Pioneer suggested leaving it unplugged for an hour to ensure all of the voltage was drained from the capacitors to allow the unit to reset. BTW, I tried pulling the fuse to the radio in the fuse panel first. This did not work. Pioneer discouraged unhooking the positive battery cable of your car because voltage spikes can occur when hooking the battery back up and result in damage to the head unit.

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I had the same issue, my battery was died due to headlight was ON and later player was showing AO. I am going to reset the unit and see if it will solve my problem.

Posted on Aug 24, 2008

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Same problem. Battery went dead and I received the error AO message when I tried to play a CD. A Circuit City installer pulled my deck with the extraction keys and grounded out the deck by applying one of the wires to the small indentation on top of the deck. That reset the theft prevention on the CD player and I was happy until my battery went dead again. :(

Posted on Nov 24, 2009

Okay. i have had the same problem before. along with that problem, if i push buttons while in another mode, ie. fm/am radio, it's like the buttons on the deck were re-mapped or one button does a different action than it should. now, i found that when i connected the radio, i had the faceplate on, with the battery terminals still connected. this apparently sends a surge or something to that effect through the radio, causing the cd player to not work, the buttons re-mapping and so on. in order to reset itself, you have to unplug the harness from the back. take the face plate off, then wait about 30 minutes just to be sure that all "left over" power is released. after all that, just plug the harness back in, with out the face plate attached, then put the faceplate on. it should work. after the first time it happened to me, i did everything to replicate the problem, then found out about the faceplate causing it. trust me, try it out and it'll work everytime.

Posted on May 07, 2008

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