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.
Control Module
The infotainment control module (ICM) acts as a gateway between the CAN and MOST network. It also acts as the master control module in the MOST network and checks the other control modules.
The infotainment control module (ICM) consists of the following components:
- display/printed circuit board
- left-hand keypad
- right-hand keypad
- remote controls (up to two).
The infotainment control module (ICM) controls functions run on the MOST network via its user interface. The command is transmitted from the infotainment control module (ICM) to the other control modules in the network. These implement the requested functions, for example sound playback, changing sound sources and radio settings.
The infotainment control module (ICM) also controls the Security function on MOST.
The infotainment control module (ICM) is in the center console. The control module is removed from the center console for replacement.
The keypad unit and display/printed circuit board can be replaced separately. These are removed by detaching the front panel on the infotainment control module (ICM).
The Infotainment control module (ICM) communicates with other control modules, via CAN communication and via MOST communication.
MOST communication is via a fiber optic communication link.
The control module checks activations and input and output signals via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if the infotainment control module (ICM) detects a fault.
Any diagnostic trouble codes (DTCs) are stored in the control module memory. This information can be read off using the diagnostic tool via the data link connector (DLC) in the vehicle.
A simple way to ensure that the infotainment control module (ICM) is powered and grounded is to check that the button lighting on the infotainment control module (ICM) is lit when the ignition key is in position I or II.
If the button lighting is activated, the Infotainment control module (ICM) is powered and grounded.
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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.