CTS Sedan RWD V6-3.0L (2010)
Charging/Battery/Battery Cable/Negative/Service and Repair/Battery Negative Cable Disconnection and Connection).
Caution: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.
3. Unlock and disconnect the engine wiring harness electrical connectors (1) from the ECM (2).
4. Use the tabs (3) in order to disengage the retainers (2) on the ECM bracket from the ECM (1) and remove the ECM.
5. If replacing the ECM bracket perform the following steps, otherwise proceed to step 4 in the installation procedure.
6. Using a small flat-bladed tool, depress the locking tabs (1) on the ECM bracket.