Onstar Control Unit

OnStar Control Unit Input Test/Replacement

'03 model:

1. Open the trunk lid, and remove the OnStar system control compartment cover.
2. Remove the OnStar system control compartment with bracket.
3. Remove four screws which installs the OnStar control unit and OnStar system interface unit onto bracket.
4. Disconnect the 32P connectors from the OnStar control unit.













5. Inspect the connector and socket terminals to be sure they are all working good contact.
- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals look OK, make the following input tests at the connector.
- If a test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, the control unit must be faulty; replace it.