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.
Network Design: Notes
Model year 2007
Model year 2008 (up to and incl. structure week 200745)
Model year 2008 (from and incl. structure week 200746)
The MOST network is an optical network where all control modules are connected in a ring.
All messages on the MOST network travel in the same direction from the Infotainment control module (ICM) to the Remote Digital Audio Receiver (RDAR).
In a fiber optic network, light pulses are transmitted instead of electrical signals. The light pulses are interpreted in the same way as the electrical signals on the CAN network.
The MOST network uses the master-slave concept. This means that a master control module, infotainment control module (ICM) has overall control of communication on the MOST network.
The fiber optic cable is made of plastic. Communication is using red light on a wavelength of 650 nm.
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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