how do you set your clock on a pioneer deh-1900mp car radio
you press the settings tab
Hold func button
Press function button to display clock and change using arrows
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click on the audio button to select clock and press to toggle from hour or minute you want to set and press + or - to select the number. To cancel set up, click band button.
Turn off the stereo then push the menu button on some models this is the volume dial, if yours pushes in, the it will ask you if you want to set the clock or any other options listed there.
I suspect you mean why do need to set the clock of the pioneer deh 1550? If this is the case the problem is that there is a wire that comes out of the radio that must have power all the time, that wire is for the memory. You also didn't state if the radio preset stations have to be reset also. This would also be an indication that the memory is not powered up when the key is off.
Below are the instructions for setting the clock on a Pioneer DEH-P4900IB. This information comes from the "Pioneer DEH-P4900IB Operations Manual" pages 22-23.Setting the date and clockUse these instructions to set the clock.1. Press FUNCTION to select clock.2. Press "left" or "right" to select the segment you wish to set."Day-Month-Year-Hour-Minute"As you select segments of the clock display the segment selected will blink.3. Press "up" or "down" to set the date and clock.Pressing "up" will increase the value of the selected segment. Pressing "down" will decrease the value of the selected segment.
turn the key on but have the CD player off. push and hold the audio button until the clock setting displays
With key on and stereo off hold both the clock and audio button clock reading will blink use up and down arrows to change hour then left and right to switch to minutes up and down to set press clock button again and done
turn off the unit first hit the clock button then hit the function button then it will flash then its ready for your input "use the arrows when its flashing to change the time".