To remove
- Carry out Diagnostic procedures before replacing control modules.
- Remove OnStar control module (673), 5D , OnStar control module (673), 4D or OnStar control module (673), CV .IMPORTANT: Take care when releasing the locking mechanism on the connector so as not to damage the connector. Pull the halves straight apart to avoid bending the pins.
- Remove the nuts (A).
- Lift out the branching piece for the aerial signal (B).