ONSTAR System
- Special Tools
- Component Location Index
- System Description
- Circuit Diagram
- Self-diagnostic Function
- DTC Troubleshooting
- Notes
- DTC B1401 (1-1): OnStar Control Unit Internal Error (CPU Error)
- DTC B1402 (1-2): Onstar Control Unit Internal Error (EEPROM Error)
- DTC B1403 (1-3): GPS Receiver Error
- DTC B1404 (1-4): Telephone Module Error
- DTC B1400 (3-1): Communication Bus Line Error (BUS-OFF)
- DTC B1405 (3-2): OnStar Control Unit Lost Communication with Driver's MPCS Unit (Door Switch Message)
- DTC B1406 (3-3): OnStar Control Unit Lost Communication with Driver's MPCS Unit (Door Look Switch Message)
- DTC B1407 (3-4): OnStar Control Unit Lost Communication with Driver's MPCS Unit (ASLOCKSW Message)
- DTC B1408 (3-5): OnStar Control Unit Lost Communication with Gauge Control Module (VSP/NE Message)
- DTC B1425 (2-1): OnStar Control Unit Lost Communication with SRS Unit (collision detection system line)
- DTC B1426 (2-5): OnStar Switches Circuit Malfunction
- DTC B1427 (2-6): Microphone Circuit Malfunction
- DTC B1428 (2-3): GPS Antenna Circuit Malfunction
- DTC B1433 (2-4): Cellular PHONE Antenna Circuit Malfunction
- OnStar System Control Unit Input Test
- OnStar Button Test
- Cellular Phone Antenna/OnStar System GPS Antenna Replacement
- Microphone Removal/Installation
- Transitioning the OnStar Control Unit to Market Mode
- Control Unit Replacement