Faulty Signal

Faulty signal

Checking the component
The infotainment module (ICM) has registered that the Accessory USB unit (AUU) is invalid according to the list stored in the central electronic module (CEM).
The cause of the fault is probably that no software has been downloaded or that software downloading has failed after replacing Accessory USB unit (AUU).

Hint: When downloading software after replacing a control module, the serial number of the control module is stored in the central electronic module (CEM). This is so that the security on MOST function can approve the control module in the MOST network in the car.

If the fault persists after software download, try replacing the Accessory USB unit (AUU).
Remedy as necessary.

Other information
- Universal Serial Bus (USB) Module Universal Serial Bus (USB) Module





Continue - Verification

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Fault-tracing information

Attempt New Test - Checking the component

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Verification

Hint: After carrying out the repair, check that the fault has been remedied.

- Ignition off.
- Reinstall the connectors, components etc.
- Ignition on.
Check function of the Accessory USB Unit (AUU).

Is the system working?

Yes - FAULT FOUND

No - Fault-tracing information

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