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2006 MDX. I disconnected the battery to clean the terminals, and I had to enter the 5 digit code to reset the radio. No problem. Now the control panel wants a 4 digit code before I can access any of the fan controls, temp, etc. Where do I get that 4 digit code?
 

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Is it possibly asking for a code for your phone handsfree interface? That would have been programmed by the previous owner, and could be anything. I'd try the "usual suspects"... 0000 and 1234.
 

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Iirc holed down “cancel, map and menu“ buttons simultaneously, should go into a diag mode. There is a window that will have the serial number for navigation unit. Dealer will have the code for that serial number.
 
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