Code -ECM I have the code, thats not the problem. The problem is the disconnect from the ECM. I need to know how to reconnect the Code Request system back to the ecm so that I can put at least put the Radio code in and get my radoi to come back on? And all I know is what the mechanic told me was that he went under the dashboard to disconnect the Code System Request!

I'm not positive I understand your request but let's see if this covers your question. You can clear the codes and history in the ECM by disconnecting the battery for 5 to 15 minutes. After you reconnect the battery. The ECM will be in default. The engine may start hard, run rough or shift poorly, this is normal. The car will need to go through two or more drive cycles until it relearns enough to come out of default. If this does not answer your question please write back and try rewording your request differently. If there is anything else please feel free to write back as well.

The security code for the ecm needs to be reset also the ecm may need to be reflashed as leaving the battery disconnected has been known to wipe or corrupt the ecm
The ecm is the engine control module that contains the security system and the operating system for the correct running of the engine
Also get the starter motor solenoid checked
Refreshing means you get the ecm reloaded with the engine control software and the keys relearned to the security system

DTC P1780 (3.0L (L81))

To improve shift feel, the transmission control module (TCM) may request that the engine control module (ECM) reduce engine torque during shift events. When such a request is received, the ECM responds by retarding the base ignition timing and notifying the TCM that the request has succeeded. If the ECM is unable to comply with the request, the ECM sends the TCM a message that the request has failed.
The torque reduction request is sent to the ECM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM. A fault in the CAN will not cause DTC P1780 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P1780.
When the TCM receives a torque reduction failure message from the ECM, then DTC P1780 will set. DTC P1780 is a type C DTC. Take your pick of which you think this code is for , this or the TSB - technical service bulletin. What need to hook up scan tool an data PID'S - Do you know what PID'S are ? sensor data read on a scan tool .

Hi Rich Stuck,P0700 means Transmission Control System (MIL Request),P1684 means Battery Disconnected within last 50 starts.More read Diagnostic Trouble Code Table ,hope it can help you.

P0500 since the speed dometer is working and you get the code P0500 The harness from the speedometer to the ECM need to be check, Go behind the spedometer disconnect and reconnect and retest,if you have a no go go to the ECM disconnect and reconnect and retest ,Your problem is basically in the harness from Speedometer to ECM.As for P1445 make it a hobby of inspecting the canister purge valve hose for rupture or torn if all good replace the purge valve

If you can't get it to reset by resetting the ECM then you still have a fault in the system that needs to be addressed. You can reset the ECM by disconnecting teh negative battery cable for 60 seconds then reconnecting it. Make sure you have the lock code for the radio written down before you try this as you will most likely have to re-enter that code after doing the rest.

The TCM can request activation of the MIL lamp Via a communication line to the ECM. This is only a request from TCM to ECM to turn the MIL on. The fault code is stored in the TCM. Select Transaxle system on the Scantool and monitor DTC related automatic transaxle system.
DO ALL REPAIRS associated malfunction with A/T. Is that all?

P1529 TCU Request for MIL On / Freeze Frame to ECU via CAN
1. This is only a request from TCM to ECM to turn the MIL on. The fault code is stored in the TCM. The Freeze Frame Data is stored in the ECM under the P1529 request code. Be sure to retrieve freeze frame data before clearing code P1529 from ECM. 2. Check the transaxle system.

try leaving the key on for an hour it may just be in code lockout mode -jeff

What you probably have to do is enter a security code to unlock the radio - it's an anti-theft idea done by Saab, that Audi and BMW and others also do, to try and make it harder to re-sell stolen radios.

Go to the dealer with photo ID, the title to the car, and your registration - that way you prove who you are and that you own the car, and they can look up the code for you. They may charge you up to an hour's labor for this. Make sure they give you the code though, and don't just have a technician put it in. If you don't get the code from them, you'll have to pay them the next time too.