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You will need to "marry" the ECU and the security modules.
By 'security module' do you mean the keyless entry module?
eg:
In other words, I'm wondering if I get the ecu,locks, key *and* keyless entry module from the same '04 mt, then swap into my '04 mt-could I forego the programming.
The ECU needs to be programmed to the other CAN modules in the car. Ones that come to mind are the power steering module and the traction control/DSC/ABS unit and the dash.
What Dan said, as well as the alarm/immobilizer module.
I am having quite a nightmare with my own car right now.....
I had an issue with mine as well. Put in an ECU and reprogrammed it and all was good for a while.
( after the tech and I spent about 3hrs trying to figure it out...on the line with MNAO Techline a few times too. It is NOT that easy to do..sometimes you have to do steps multiple times to get it to work)
About a week after that it wouldn't start...and wouldn't connect to the WDS.
Dealer couldn't figure it out...after about an hour they said that the ECU was screwed again....so I took it home . Spent about 2 hours going over everything I could think of....and finally found the stupid fuse that supplies the power to the OBD connector had blown. After that everything worked properly and it started right up. Never did really sit down and figure out the reason...might have been the power source for the immobilizer module? Haven't had a problem in the last 6 or 7 years so not sure where the issue came from in the first place.
I had an issue with mine as well. Put in an ECU and reprogrammed it and all was good for a while.
( after the tech and I spent about 3hrs trying to figure it out...on the line with MNAO Techline a few times too. It is NOT that easy to do..sometimes you have to do steps multiple times to get it to work)
About a week after that it wouldn't start...and wouldn't connect to the WDS.
Dealer couldn't figure it out...after about an hour they said that the ECU was screwed again....so I took it home . Spent about 2 hours going over everything I could think of....and finally found the stupid fuse that supplies the power to the OBD connector had blown. After that everything worked properly and it started right up. Never did really sit down and figure out the reason...might have been the power source for the immobilizer module? Haven't had a problem in the last 6 or 7 years so not sure where the issue came from in the first place.
Thanks for that. .. let's me know what the situation could be and what I may be in for.
Looks like I've got some decisions to make.