Clock resets whenever door is opened or button pushed.

Digital Clock The time is displayed continuously when the ignition is switched to II or III. At all other times, push in on the lid to display the time. To adjust the time: 1. Lower the lid. 2. Push the minute button (M) and hold it until the numbers advance to the desired minutes. 3. Push the hour button (H) and hold it until the numbers advance to the desired hour. 4. The RESET button allows you to synchronize your clock to the closest hour. If the time on the clock is before the half hour, pressing the RESET button will return the time to the previous hour. If the time is beyond the half hour, the RESET button will change the time to the next hour. NOTE: Be careful not to push the H, M or RESET buttons accidentally. Pushing any of them will change the clock's time setting.

Hope this helps
If you are talking about the clock on the DVD display then.....

Audio display model
1. Turn the audio unit on by pushing the "PWR"
button.
2. Push the "MENU" button until the display
indicates the clock adjustment mode.
If the "CLOCK OFF" is indicated on the display,
push the "TUNE" button to change the mode
to "CLOCK ON". Then push the "MENU" button
The time indicator will flash.
3. Push the "SEEK TRACK" button to adjust
the hour.
Push the "TUNE" button to adjust the
minute.
Pushing the , buttons will advance
and , buttons will turn back
the time.
4. Push the "MENU" button to finish the
adjustment.

Even though it doesn't say locked, it probably is. Check your driver's manual to see how to reset it.

Hi.

Here the relevant extract from owners manual.

To reset the hour: Push the "MODE" button until the hour display appears and blinks. Then push the "RESET/ADJ" button.
To reset the minutes: Push the "MODE" button until the minute display appears and blinks. Then push the "RESET/ADJ" button.
After resetting the clock, push the "MODE" button until the display returns to normal calendar mode.

Register for free here to get the online support: 2004 Toyota Avalon Owners Manual FREE

Regards.

Ginko

I have a 2003 mpv. my radio has a clock button. it also has a scan / auto rocker button.
i press and hold the clock button till the numbers flash then press the scan button to change the hour and the auto button to change the minute. when the time is right, i push the clock button again.
hope this helps you!

there are two buttons on the diagram panel screen, push and hold top button and a one of the entries will start to blink, then you use the bottom button to change the entry, when you are ready to move to the next entry push the top button again.

Dear Sir!
Beside the digital clock must be 2 switches, one is for hours and the other is for minute, if it is not when the time is 12:00 take out the clock fuse and enter it again the time will be automatic 12:00.
The clock fuse is under stearing wheel.
Hope to hepled you.
Mustafa, Kabul Afghanistan

There are three buttons, let's call them 1, 2, and 3, from left to right.


Clock
Time setting

A. 12 AM, PM or 24.00 h
With the clock in the time readout mode, keep
button (2) depressed for 4 seconds -12 AM, PM
or 24.00 flashing. After pushing button (1), either
a 12-hour (AM + PM) or a 24-hour setting
program can be selected. If you only want to
change the display mode, push button (3). The
clock then returns to its normal timekeeping
function.

B. Hours
Push button (2) a second time - hour display
flashes. Set hour by pushing button (1). After
pushing button (3)*, the clock returns to the time
readout mode with new hour setting.

C. Minutes
Push button (2) once more - minute display
flashes. Set minute by pushing button (1). Upon
pushing button (3)*, the clock is started -
accurate to within 1 second.

Stop watch function
The stop watch can only be set in motion if the
clock is in its normal timekeeping mode and not
during setting operations.
A. Push button (3) - 00:00 display appears;
B. Push button (1) - stop watch is on;
C. Push button (1) a second time - watch stops.
(Additional times can be added by pushing button
(1) again - stop watch keeps running. Push button
(1) once more to stop timing.)
D. Push button (2) - 00:00 display appears;
E. Push button (3) - normal timekeeping mode.

If button (3) is pushed during operation A and
B, the setting procedure must be restarted
(push button (2)).

hi , I hope this help you out. the digital clock of your porsche 944 late 85 is a chronometer also.
this digital clock has three buttons, lets call them A,B,C from left to Right.
to set the time press the B Button for 5 seconds. the digits should be flashing by that time.
It will show you the option of 12H or 24h Mode, press the A button to select what you want, after push the B button to select the Hours it should be blinking Press the A button to select your time. repeat step to set the minutes.when your done Push the C button.

By now your digital clock would be set. the chronometer is the C button. to switch between clock and chronometer push C button, if you select chronometer. the A button start and stop, the B button Reset. Good Luck

You can download a soft copy (PDF file) owner's manual by going to the following website and registering your vehicle. It's easy.
http://www.gm.com/gmownercenter/chevy/

To reset the clock, with the ignition on, push the clock button and then turn the "i" dial to change the hours. Push the clock button again, to change the minutes, etc.