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.
Voice Control System Components
The voice recognition system enables voice operation of the telephone, Infotainment and navigation system.
Functions can be conveniently operated by voice commands. System is activated via the PTT button in the multifunction steering wheel.
The voice recognition system is integrated in the Information Electronics Control Module 1 -J794-.
Fault finding is performed via "Guided Fault Finding" Refer to Vehicle Diagnostic Tester.
- Front Information Display Control Head -J685-
- Inside the center of the instrument panel
- Multimedia System Control Head -E380-
- in center console, front
- Information Electronics Control Module 1 -J794-
- in instrument panel
- Connector assignment, refer to Information Electronics Control Module 1 -J794- CONNECTOR ASSIGNMENT
- Removing and Installing, refer to Information Electronics Control Module 1 -J794-, REMOVING AND INSTALLING
- Data Bus On Board Diagnostic Interface -J533-
- Inside the luggage compartment on the rear panel on the right side
- Steering Column Electronics Control Module -J527-
- On steering column at steering column switches
- Multifunction Steering Wheel
- Buttons, removing and installing, refer to RIGHT/LEFT MULTIFUNCTION BUTTONS ON STEERING WHEEL -E441- / -E440-, REMOVING AND INSTALLING .
- Digital Sound System Control Module -J525-
- Inside the luggage compartment on the rear panel on the left side
- Radio -R-
- Inside the luggage compartment on the rear panel on the right side/in the left luggage compartment recess.
- TV Tuner -R78-
- Inside the luggage compartment on the rear panel on the left side/in the left luggage compartment recess.
- DVD Changer -R161-
- in the glove compartment
- Microphone Unit in Front Roof Module -R164-
- Refer to OVERVIEW - MICROPHONE UNIT
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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