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.
Overview - Sound System, Basic Sound System (8RM)
The Basic Sound System consists of the following components:
- One speaker on the left and right side of the instrument panel
- One speaker in the left and right front doors
- Two speakers in the left and right rear doors
- Information Electronics Control Module 1 -J794- in the rear center console
- Information Electronics Control Module 1 -J794- in the Rear Center Console
- Left Front Treble Speaker -R20- /Right Front Treble Speaker -R22- on Left and Right Sides of the Panel
- Left Front Bass Speaker -R21- /Right Front Bass Speaker -R23- in the Lower Front Doors
- Left Rear Treble Speaker -R14- /Right Rear Treble Speaker -R16- in the Rear Door Trim Panels
- Left Rear Bass Speaker -R15- /Right Rear Bass Speaker -R17- at Bottom of the Rear Doors
- MOST Bus
Fault Finding is performed using the "Guided Fault Finding" on the Vehicle Diagnostic Tester.
Notes on MOST bus
The optical data bus "MOST bus" is used in addition to the CAN bus.
A fiber-optic cable is used. Fiber optic cables are routed inside corrugated tubes for protection.
Replace the complete fiber-optic cable if possible.
The front surfaces of the connectors must not get dirty.
If the connectors are disconnected: connect the Fiber-Optic Repair Set - Connector Protective Caps:VAS6223/9 from the Fiber-Optic Repair Set:VAS6223A .
When routing fiber-optic cables, make sure not to go below the minimum bending radius of 25 mm. Do not crush or kink the fiber-optic cables.
Fiber-optic cable repair. Refer to WIRING HARNESS AND CONNECTOR REPAIRS .
NO RELATED
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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.