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 accessory USB unit (AUU) is designed to serve as an interface between the vehicle's infotainment system and external USB and iPod devices that support the standard for removable media on USB 2.0.
Examples of USB/iPod devices that support the standard for removable media on USB and 2.0 are:
- Cameras
- MP3 players
- Handheld computers
- Portable USB drives
- iPod G4 from version 3.1.1
- iPod G5 from version 1.2.1
- iPod mini from version 1.4.1
- iPod nano from version 1.1
- iPod Video from version 1.1
The Accessory USB unit (AUU)is located in the tunnel console between the seats and the associated USB port is located either in the glove compartment or in the tunnel tray.
The accessory USB unit (AUU) has serial optic communication with components on the MOST network. All communication with the accessory USB unit (AUU) is handled via the infotainment control module (ICM).
In order to function in the MOST network, the infotainment control module (ICM) checks that the accessory USB unit (AUU) has a correct serial number. If the number is incorrect, the accessory USB unit (AUU) does not work.
The accessory USB unit (AUU) checks executed activations and input/output signals via its integrated diagnostics. If the control module detects a fault, a diagnostic trouble code is generated. Any diagnostic trouble codes are stored in the control module memory. The information can be read via the data link connector in the vehicle.
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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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