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Unable to insert CDs into the 2012 NTG 4.5 Comand E350 Saloon - what is the status of the SD card slot?


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I decided to use a traditional approach of inserting CDs into my Comand unit, harbouring an idealistic expectation of achieving optimal sound quality from the device.
I am presently streaming from a playlist on my phone using a Bluetooth connection. It functions reliably, although I am uncertain about its quality.
The build sheet specifies the components for the Command unit:

512 COMMAND APS WITH DVD CHANGER 518 UNIVERSAL COMMUNICATIONS INTERFACE (UCI)

This appears to be NTG 4.5, of which I am rather certain.

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When I attempt to insert a disc, the machine appears unresponsive, and I am unable to push the disc into the slot, despite it feeling correctly positioned.
Upon accessing the CD menu on Comand by selecting the stacked multi-disc button adjacent to the "DISC" button depicted above, I observe six vacant slots within the internal CD changer designated for discs.
Selecting "eject (all)" yields no result.

I have not utilised it throughout the five years of automobile ownership, hence I am unaware of its functionality.

Question 1 Am I engaging in an unwise action or neglecting an evident step to enable this machine to receive discs?

Question 2 As an individual proficient in DIY, how can I repair a broken item?

Question 3: If the device is malfunctioning and does not accept CDs, can I transfer high-quality audio onto an SD card, specify the format, then insert it into the slot beneath the rewind/back button to achieve superior audio quality?

I appreciate your assistance in advance.

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If it like my w211, there exists a distinct compartment for six CDs in addition to a CD/DVD player. I am uncertain regarding your specific vehicle; but, it may possess a singular CD slot containing a disc that requires ejection. To insert the six CDs, you may need to utilise the glove compartment or trunk, or, in the case of my 211, a panel discreetly retracts from the central console in a manner reminiscent of James Bond. It may be entirely incorrect, but it is worth attempting. The handbook will likely provide that information; I may examine it out of interest.

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Audio files in MP3 format can be transferred to an SD card on your PC, which can thereafter be inserted into the SD card slot in COMAND. You can organise the MP3 files into folders. You will want either a PC equipped with an internal SD card reader or an external USB card reader.


Upon inserting the SD card containing the MP3 songs into the COMAND device, you may either play the music directly from the SD card or transfer the MP3 files to the Music Register on the COMAND's internal HDD.

The HDD in COMAND NTG4.5 possesses a total capacity of 100 GB, with 10 GB designated for the Music Register. However, be advised that transferring mp3 files from the SD card to the internal Music Register is a time-consuming process.

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I possess multiple SD cards that were formerly utilised for computer-related purposes.

To maintain simplicity, I will endeavour to transfer only 2 or 3 albums onto each device to facilitate music discovery. I can proceed without utilising the music register while I attempt this.

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Based on recollection, I would assert that sequencing and organisation are somewhat cumbersome. Files must be written in the sequence of their intended usage. This technology is 15 years old.

I prefer utilising a Bluetooth stream or a connected connection. It is user-friendly, voice-activated, and provides access to Waze, podcasts, and Spotify upon spoken request.


No menus, no buttons."Hey Siri, play 'Slave to the Rhythm' by Grace Jones on Spotify."

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