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.
Head Unit Control Unit, Basic Function - GF82.85-P-9891A
Model All with Connect 20
Overview
This document contains information on:
- General
- Function requirements
- Function
General
The head unit control unit is the central computer unit for the entertainment and communication systems integrated in the vehicle.
The head unit control unit is connected to the network architecture of the vehicle.
The head unit control unit is located in the instrument panel or under the right front seat.
Function requirements
- Circuit 30t ON
Function
Depending on the equipment installed, the head unit control unit controls the following functions:
- Multimedia system control
- Radio mode
- Media mode
- TV mode
- Smartphone integration
- Telephone
- Navigation
- WLAN hotspot
- Voice control
Depending on the equipment installed, the head unit control unit contains the following components:
- Radio tuner TV tuner
- Amplifier GPS receiver
- Bluetooth® receiver
- WLAN receiver
| Further basic functions | |||
| Multimedia system, basic function | GF82.85-P-9900A | ||
| Component descriptions | |||
| Head unit, component description | Model 223 with Connect 20 | GF82.85-P-3140A | |
| Model 243 with Connect 20 | GF82.85-P-3140B | ||
| Model 206 with Connect 20 | GF82.85-P-3140C | ||
| Model 297 with Connect 20 | GF82.85-P-3140D | ||
| Model 295 with Connect 20 | GF82.85-P-3140E | ||
| Model 232 with Connect 20 | GF82.85-P-3140F | ||
| Model 296 with Connect 20 | GF82.85-P-3140G | ||
| Model 254 with Connect 20 | GF82.85-P-3140H | ||
| Model 214 with Connect 20 | GF82.85-P-3140K | ||
| Model 118 as of model year 2023 with Connect 20 Model 177, 247 as of model year 2022 with Connect 20 | GF82.85-P-3140L | ||
| Model 167 as of model year 2023 with Connect 20 | GF82.85-P-3140M | ||
| Model 294 with Connect 20 | GF82.85-P-3140N | ||
| Model 192 with Connect 20 | GF82.85-P-3140R | ||
| Model 465 with Connect 20 | GF82.85-P-3140T | ||
| Model 236 with Connect 20 | GF82.85-P-3140S |
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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.