: Need a new ecm

09-17-12, 09:31 PM
Ive had this catera for a while. Spent time at a dealership. They told me I needed a new ecm. Guy i bought it from said he replaced the ecm and all it needed was to be reprogrammed. Well that wasn't the case and the dealership wants $850 to replace it. I only paid $750 for the car. Can you find these elsewhere and how hard is the install?

09-18-12, 04:49 PM
its easy to replace it
but whats the problem with your old one ?????

09-19-12, 09:24 AM
Ive got to remove/replace the battery cable for 10 seconds everytime i want to start the car. The guy i bought it from said it was replaced just wasnt reprogrammed. Dealership said I need a new one. They want $850 to replace it. I paid $750 for the car.

09-19-12, 01:26 PM
NOTE: Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components.

IMPORTANT: In order to prevent any internal ECM damage, the ignition must be turned OFF when disconnecting or reconnecting the power to the ECM. This includes disconnecting or reconnecting the battery cables, the ECM fuse, the jumper cables, etc.

Removal Procedure
Turn OFF the ignition.
Remove the under hood fuse/relay cover.
Grasp the ECM (2) and slide the unit straight up and out of the underhood relay center.
Flip the release lever and disconnect the ECM connectors (1,3) from the ECM.
Remove the fastener retaining the ECM ground wire to the ECM.
Remove the fasteners that retain the ECM to the backing plate.
Remove the ECM from the backing plate.
Installation Procedure
The ignition must be OFF.
Install the ECM (2) to the backing plate with the fasteners.
Tighten the fasteners to 4 N.m (35 lb in) .

Install the fastener that retains the ECM ground wire to the ECM.
Tighten the fastener to 4 N.m (35 lb in) .

Carefully align the harness connector with the ECM connector.
Guide the connector into place while moving the release lever to the locked position.
Align the backing plate of the ECM with the slots in the relay center and slide the unit into the underhood relay center.
Program the frequency code of the new ECM with the frequency of the theft deterrent module using the following procedure:
7.1. Connect the scan tool to the vehicle.
7.2. Turn ON the ignition with the engine OFF.
7.3. Select Service Programming on the scan tool.
7.4. Program the vehicle configuration as required.
7.5. Follow the instruction on the scan tool to request the information from the controller.
7.6. Remove the scan tool from the vehicle.
7.7. Connect the scan tool to the Techline terminal.
7.8. Follow the instructions on the Techline terminal to perform the Vehicle Theft Deterrent Learn function using the Service Programming System.
7.9. Turn OFF the scan tool.
7.10. Disconnect the scan tool from the Techline terminal.
7.11. Reconnect the scan tool to the vehicle.
7.12. Turn ON the ignition with the engine OFF.
7.13. Return to the Service Programming menu and follow the instructions to program the frequency code.
7.14. After the programming is complete, clear any DTCs that may have set in the ECM prior to learning the correct theft frequency code.
Perform the Idle Learn Procedure. See: Testing and Inspection
Install the under hood fuse/relay cover.

09-19-12, 01:31 PM



09-19-12, 01:37 PM
get used one go to dealer to reprogram and save half of the money
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=221115775504&fits=Year%3A2000%7CMake%3ACadillac%7CModel%3ACater a&_trksid=p2045653.m1253

10-01-12, 07:47 PM
can i install it in my driveway and be able to start the car to get it to the dealership?

10-01-12, 09:30 PM
u can try, by i dont think so, usually its dont work like that
u can tow your car to them, and get towing money back from your insurance company. just make sure u have free tow service. usually it up to $100 per tow service

10-01-12, 11:51 PM
The new one will have to be programmed with your cars VIN.

10-02-12, 12:00 AM
so go with the tow truck route?