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 MANUALSCHEVROLET2018SONIC LS, 1.8L ENG VIN H, AUTOMATIC TRANSREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSKEYLESS ENTRY SYSTEM AND REMOTE FUNCTIONS
2018 Chevrolet Sonic LS, 1.8L Eng VIN H, Automatic Trans
Keyless Entry System And Remote Functions
2018 Chevrolet Sonic LS, 1.8L Eng VIN H, Automatic TransSECTION Keyless Entry System And Remote Functions
- Schematic Wiring Diagrams
- Diagnostic Information and Procedures
- DTC B305D
- DTC B3101
- DTC B3105
- DTC B3106
- DTC B3109-B3113
- DTC B310D-B310F
- DTC B3119
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC B3120
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC B3121
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC B3122
- DTC B3123
- DTC B3124
- Symptoms - Remote Functions
- No Remote Detected
- Keyless Entry System Malfunction
- Remote Vehicle Start Malfunction
- Repair Instructions
- Low Frequency Instrument Panel Antenna Replacement
- Low Frequency Console Antenna Replacement
- Low Frequency Rear Compartment Antenna Replacement
- Low Frequency Rear Bumper Antenna Replacement
- Keyless Entry Control Module Replacement
- Keyless Entry Control Module Bracket Replacement
- Remote Control Door Lock Receiver Replacement (4NB)
- Remote Control Door Lock Receiver Replacement (5HB)
- Remote Control Door Lock and Theft Deterrent Transmitter Programming
- Description and Operation
- Keyless Entry System Description and Operation
- Notes
- Keyless Entry Transmitters
- OnStar® Remote Link (if equipped)
- Body Control Module (BCM)
- Remote Control Door Lock Receiver
- Unlock Doors
- Lock All Doors
- Trunk Release, if equipped
- Power Liftgate, if equipped
- Vehicle Locator/Panic Alarm
- Remote Vehicle Start, if equipped
- Enable/Disable Remote Vehicle Start
- Hood Ajar Switch
- Remote Vehicle Start Circuit Description
- Keyless Entry Personalization
- Keyless Entry System Description and Operation
- Special Tools and Equipment
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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.