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Replacement parts for MAYTAG MDBTT70AWB Dishwasher - Undercounter | AppliancePartsPros.com

Here is a tech sheet
http://www.servicematters.com/docs/wiring/TechSheets_11_17_09/Schematic%20-%20W10179503.pdf

[COLOR="Blue"]control pad wont unlock by doing what the instructions say to do[/COLOR]
Not sure what you mean by unlock?
Try unplugging/ removing power from the unit for half an hour or so to see if it will reset.
Try running the diagnostics.
Perhaps the keypad (control panel) has an open key. Try the below cleaning if that does nothing check the keys with a meter.

The usual way to troubleshoot is check the keys with a meter. If all OK then it is probably the control board.

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.

If you do not own a meter, I would suggest you purchase a one. You can get a decent digital multimeter for under $20.00. You do not need fancy though it is nice if the leads are a couple feet long.
If it saves ordering one unnecessary part it has paid for itself and you end up owning a useful tool.
Most places will not let you return electrical parts so if you order it, you own it.
A couple things to watch when measuring ohms and continuity
1. Always remove power from the machine otherwise you could blow your meter.
2. Always disconnect at least one side of any device you are checking. This eliminates the possibility of measuring an alternate/parallel circuit path.
3. When checking for closed contacts and continuity use the lowest scale (Usually 200 ohms). Then try higher scales. This scale is 0 to 200 ohms so if the device you are measuring is 300 ohms this scale would show an open circuit which it is not, you are just measuring outside the scale's dynamic range.

There is a good STICKY at the start of this forum about it's use.