Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1999CHEVY EXPRESS G1500, VAN CARGO, 5.7 RREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSANTI-THEFT SYSTEM
1999 Chevrolet Chevy Express G1500, Van Cargo, 5.7 R
Anti-Theft System
1999 Chevrolet Chevy Express G1500, Van Cargo, 5.7 RSECTION Anti-Theft System
- Description & Operation (Domestic)
- Description & Operation (Export)
- Component Locations
- Programming
- Trouble Shooting
- Self-Diagnostic System
- Diagnostic Tests
- DTC B0687: Security System Indicator Low
- DTC B0688: Security System Indicator Circuit High (Domestic)
- DTC B0688: Security System Indicator Circuit High (Export)
- DTC B1007: EEPROM Write Error
- DTC B2947: Security System Sensor Power CKT Low
- DTC B2948: Security System Sensor Power CKT High
- DTC B2957: Security System Sensor Data Circuit Low
- DTC B2958: Security System Sensor Data Circuit High
- DTC B2960: Security System Sensor Data Incorrect But Valid
- DTC B3031: Security System Controller In Learn Mode
- DTC B3033: Security System Indicates Tamper
- DTC C0559: EEPROM Checksum Error (Domestic)
- DTC U1016: Pcm Class 2 Serial Data Line Fault
- DTC U1193: Loss Of Vim Class 2 Communication
- DTC U1255 Class 2 Communication Malfunction
- System Tests
- Removal & Installation
- Torque Specifications
- Special Tools
- Connector Identification
- Wiring Diagrams
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.