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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 176 (CELLULAR, ENTERTAINMENT, AND NAVIGATION)
2020 GMC Acadia SL
Section 176 (Cellular, Entertainment, And Navigation)
2020 GMC Acadia SLSECTION Section 176 (Cellular, Entertainment, And Navigation)
WARNING: This page is about a different car, the 2021 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
- 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 Player and USB Receptacle Replacement
- Radio Speaker Amplifier Replacement
- Multimedia Receptacle Replacement
- 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
- 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
- OnStar Description and Operation (UI3)
- 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.