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 MANUALSGMC2020ACADIA SLREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSCELLULAR, ENTERTAINMENT, AND NAVIGATION SYSTEM
2020 GMC Acadia SL
Cellular, Entertainment, And Navigation System
2020 GMC Acadia SLSECTION Cellular, Entertainment, And Navigation System
- Specifications
- Schematic Wiring Diagrams
- Diagnostic Information and Procedures
- DTC B0560
- DTC B1023
- DTC B1024
- DTC B1025-B1135 (IOU)
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC B1025-B1135 (IOR)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Actions Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC B1025-B1135 (IOT)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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 B124B
- Diagnostic Instructions
- DTC Descriptor
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC B124F
- DTC B125A
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC B125B
- DTC B125C
- Diagnostic Instructions
- DTC Descriptors
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Missing XM Channels or No Audio On Certain XM Channels
- Component Testing
- Repair Instructions
- DTC B1271
- DTC B1277 (IOU)
- DTC B1277 (IOR)
- DTC B127C
- DTC B127E
- DTC B1446 or B1447
- DTC B2455
- DTC B2462 (UE1)
- DTC B2462 (without UE1)
- DTC B2470
- DTC B2476 or B2482
- DTC B248A
- Symptoms - Cellular Communication
- Symptoms - Entertainment
- Application Malfunction
- Auxiliary Audio Input Malfunction
- Diagnostic Instructions
- DTC Descriptor
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- Bluetooth Malfunction
- Digital Radio Poor or No Reception
- Diagnostic Instructions
- DTC Descriptors
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Missing XM Channels or No Audio On Certain XM Channels
- Component Testing
- Repair Instructions
- Phone Projection Malfunction (Apple CarPlay)
- Phone Projection Malfunction (Android Auto)
- OnStar Microphone Malfunction
- No Global Positioning System (GPS) Reception (UE1)
- No Global Positioning System (GPS) Reception (without UE1)
- OnStar Button LED Malfunction
- OnStar Call Center Remote Function Requests Malfunction
- OnStar Button Malfunction
- Radio Controls Malfunction
- Radio Information Display Malfunction
- Radio Poor Reception
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- Speaker Replacement Reference
- Speaker Malfunction (IOU)
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- Speaker Malfunction (IOR)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Actions Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- Speaker Malfunction (IOT)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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
- Unable to Contact OnStar Call Center
- Navigation System Malfunction (and SD Card Errors)
- Voice Recognition Malfunction
- SD Card Setup
- Backup Battery Reset
- Repair Instructions
- Mobile Telephone Microphone Replacement
- Human Machine Interface Control Module Replacement
- Human Machine Interface Control Module Bracket Replacement
- Communication Interface Module Replacement
- Communication Interface Module Battery Replacement
- Radio Bracket Replacement
- Radio Replacement (IOR)
- Radio Replacement (IOU)
- Radio Control Assembly Replacement
- Active Noise Cancellation Microphone Grille Replacement
- Active Noise Cancellation Microphone Replacement
- Audio Disc Player and USB Receptacle Replacement
- Radio Speaker Amplifier Replacement
- Multimedia Receptacle Replacement (GMC)
- Navigation Signal Splitter Replacement
- Radio Antenna Base Replacement
- Radio Antenna Replacement
- Antenna Coaxial Cable Replacement - Headlining
- Antenna Coaxial Cable Replacement - Instrument Panel
- Antenna Coaxial Cable Replacement - Communication Interface Module to Navigational Signal Splitter
- Antenna Coaxial Cable Replacement - Navigational Signal Splitter to Human Machine Interface Module
- Radio Front Center Speaker Replacement
- Radio Front Speaker Replacement
- High Frequency Antenna Replacement
- Radio Front Side Door Speaker Replacement
- Front Floor Speaker Replacement
- Radio Control Switch Replacement - Steering Wheel
- Radio Volume Switch Replacement
- Radio Favorites Switch Replacement
- Radio Rear Side Door Speaker Replacement
- Description and Operation
- OnStar Description and Operation (UE1)
- Notes
- Telematics Communication Interface Control Module
- OnStar® Three Button Assembly
- Secondary OnStar® Controls
- Microphones
- Cellular and GPS Antennas
- OnStar® RemoteLink
- Compass Heading
- Bluetooth®
- Phantom Phone Calls
- Back-up Battery
- WiFi Support
- Audio System Interface
- OnStar® Sleep Cycle
- Features
- Teletypewriter (TTY) Users
- Deactivated OnStar® Accounts
- OnStar® Cellular, GPS, and Diagnostic Limitations
- Mobile Identification Number and Mobile Directory Number
- Firmware Over The Air
- Radio/Audio System Description and Operation (IOS/IOT/IOU)
- Notes
- Demo Mode
- Data Communications
- Remote Radio Receiver
- Speaker Operation
- Antenna System
- Radio Reception
- Auto Volume Control (If equipped)
- Microphones
- Bluetooth ® (If equipped)
- WiFi
- Back Office Registration
- Applications (If equipped)
- Speech Recognition
- Navigation System Components and Features (if equipped)
- Locations Services
- Valet Mode
- Teen Driver
- Theft Deterrent
- Audio Amplifier (If equipped)
- Infotainment Controls and Display
- Steering Wheel Controls (If equipped)
- USB Port, SD Card Reader and Auxiliary port (If equipped)
- OnStar ® (If equipped)
- Firmware Over The Air
- Compass Data
- Media Disc Player (if equipped)
- Digital Rearview Camera (if equipped)
- Radio/Audio System Description and Operation (IOR)
- Notes
- Radio Circuit Operation
- Information Display and Controls
- Antenna System
- Radio Reception
- Digital Radio Receiver (If equipped)
- Speaker Operation
- Audio Amplifier (If equipped)
- WiFi
- Valet Mode
- Teen Driver
- Theft Deterrent
- Bluetooth® (If Equipped)
- Bluetooth® Features Supported
- Voice Recognition
- USB Port and Auxiliary port (If equipped)
- OnStar ® (If equipped)
- Locations Services
- Steering Wheel Controls (If equipped)
- Speed Compensated Volume
- Firmware Over The Air
- Active Noise Cancellation (If equipped)
- OnStar Description and Operation (UE1)
- 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.