It requires a scan tool capable of performing software flashes.
= "Do you have to flash the computer after you replaced the engine?" =
Low fluid, Trans computer that needs a software flash at the dealer, failing trans, etc
Turn Key on, do not start engine. Cycle key on and off 5 times (without starting engine) Check engine light will flash in a series. Example: flash, flash, short pause, flash= 21. If there are more than one code there will be a longer pause then the next code. Luke J. Wisconsin
A lot of these vans had software upgrades for trans shifting issues. The dealer can "flash" new software into the computer.
Turn the key on then off and on again then off again then on once more and watch the check engine light count how many times it flashes. it will flash 1 for 1 or 2 for 2 or it will flash 2 then pause then flash 5 more time for 25 or so on.
Here in Central New York, as of Nov 2012 rthe cost is around $100 just to flash the unit
If you are trying to use it while on defrost, that is normal. It is telling you you can't do that. If not then, you have a door malfunction.
A flashing check engine light indicates a engine condition that could be causing severe catalytic converter damage. The usual cause is a harsh misfire. The engine computer will have set a code, or codes that will help in diagnosis.
The local Dodge dealer does a stock reflash for $115 I am having my hot rod computer done for $450
There is a factory service bulletin about your problem. The software in the body computer needs flash updated. That is only available at the dealer.
You have a short circuit in your wiring. You need to take your vehicle to a mechanic to have it fixed before you damage your battery.
you need to flash the computer,