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.
2021 GMC Terrain SLFACTORY OEM SERVICE PROCEDURE
Headliner (except C3U)
Headliner (except C3U)
| Items |
|---|
| 1. A3R Sunshade - Right A3R Sunshade - Right . |
| 2. B77RF Radio Volume Compensator Interior Noise Microphone - Right Front (NKC) B77RF Radio Volume Compensator Interior Noise Microphone - Right Front (NKC) . |
| 3. E37RR Dome/Reading Lamps - Right Rear E37RR Dome/Reading Lamps - Right Rear . |
| 4. B77RR Radio Volume Compensator Interior Noise Microphone - Right Rear (NKC) B77RR Radio Volume Compensator Interior Noise Microphone - Right Rear (NKC) . |
| 5. E8S Rear Compartment Courtesy Lamp E8S Rear Compartment Courtesy Lamp . |
| 6. B77LR Radio Volume Compensator Interior Noise Microphone - Left Rear (NKC) B77LR Radio Volume Compensator Interior Noise Microphone - Left Rear (NKC) . |
| 7. E37LR Dome/Reading Lamps - Left Rear E37LR Dome/Reading Lamps - Left Rear . |
| 8. B77LF Radio Volume Compensator Interior Noise Microphone - Left Front (NKC) B77LF Radio Volume Compensator Interior Noise Microphone - Left Front (NKC) . |
| 9. A3L Sunshade - Left A3L Sunshade - Left . |
| 10. B24LF Mobile Telephone Microphone - Left Front B24LF Mobile Telephone Microphone - Left Front . |
| 11. A98 Front Overhead Console Assembly A98 Front Overhead Console Assembly . |
| 12. B24RF Mobile Telephone Microphone - Right Front (IOS/IOT/IOU) B24RF Mobile Telephone Microphone - Right Front (IOS/IOT/IOU) . |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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