Here is the tech sheet
http://www.servicematters.com/docs/wiring/Tech%20Sheet%20-%208535451.pdf


Here is the info on the panel lock from the operator's manual
"Use the Lock On to prevent unintended use of the dishwasher.
You can also use the lock feature to prevent unintended cycle or
option changes during a cycle.
When LOCK ON is lit, all buttons are disabled.
NOTE: The dishwasher door can be opened while the controls
are locked. However, the lock must be turned off and the Start/
Resume button pressed to resume the cycle.
To turn on the Lock
Press and hold HEATED DRY for 4 seconds. LOCK ON glows.
If you press any pad while your dishwasher is locked, the light
flashes 3 times.
To turn off the Lock
Press and hold HEATED DRY for 4 seconds. The light turns off."

You can get a manual from the following.
Life Management: Everything just got easier - ManageMyLife.com
You will have to register but do not send out junk mail as long as you do not ask for it.

If it is not locked, try the diagnostics.
Check that both door switches are closing properly and that the wiring in the door is OK.

It could be you have a bad key (open).
The usual way to check this is check the keys with a meter, if all OK then odds are it is the control board and not the key[pad at fault
Still a bit of a crap shoot but your odds are better.

You may also want to try the following
Connector Cleaning / Checking
Unplug the unit
Open it up
Remove the ribbon cable from the keypad to the control board at the control board.
Clean the edge connector.
If it is the type where there is not a connector just the insulation is removed, it can be cleaned with a pencil eraser. Do not use an ink eraser as it is too abrasive.
Check the tracks in the ribbon cable for hairline cracks. A magnifying glass helps here.
Would not hurt to clean the connector on the board. Use electronics contact cleaner or isopropyl alcohol and a tooth brush. Be gentle and do not reconnect till all the solvent evaporates.
Reconnect everything and give it a try.