USB test with the Integrated Measurement Interface Box R2 (IMIB - without ISTA)

The Integrated Measurement Interface Box R2 (IMIB) makes it possible to test the USB ports in the vehicle. Two tests are available for this purpose in the IMIB. The load test is an electrical test of the USB interface, whereby only the vehicle-side voltage supply and the current level of the USB port are tested. With the media test , various media files are made available via USB and are played back in the vehicle.

NOTE: The USB tests must be used as independent tools for diagnosing vehicle belonging to the BMW group. The testing of other USB components (PC, data carriers, accessories, etc.) is not permitted and could cause permanent damage to the IMIB. The tested USB connection is only fully functional if both tests can be successfully completed. Only the load test for voltage and current (no media test) can be performed on the USB port in the glove box. If one of the two tests is not performed successfully, a vehicle diagnosis must be carried out with the ISTA! Warranty-related invoicing can only take place after a full diagnosis has taken place.

In order to carry out the USB tests successfully, the following general conditions must be taken into consideration.

Latest software and updates installed on the IMIB.
Battery charger connected.
Ignition turned on.
Connect USB cable to IMIB (do not connect USB cable to vehicle yet!)

NOTE: Only perform USB test with the USB cable provided in the scope of delivery of the IMIB. Always perform USB tests directly at the USB connection of the vehicle! Do not use extension cables, USB hubs etc.

The examples listed in the description only relate to tests on BMW vehicles. The system behaves identically for vehicles of the type MINI or Rolls-Royce.

Proceed as follows to perform the USB test:

In the IMIB main menu, select the bottom right menu item. Select the <USB test> menu item on the next screen mask.

Fig 1: Screen Display - Bluetooth, USB And Video Test

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You can change between the <Load test> and <Media test> in the lower area of the IMIB display.

Fig 2: Screen Display - Connect USB Port Of IMIBR2 To Vehicle

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Plug the USB cable into the USB connection of the vehicle.

Fig 3: Identifying USB Cable

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Load test

Change to the <Load test> in the lower part of the IMIB display.

Press <Start> to start the test for load current and voltage.

During the test, the load current of the USB connection is increased in steps, and the voltage is measured at the USB connection at the same time. These values are shown illustrationally on the IMIB display and documented in the indication range.

Fig 4: Screen Display - USB Connection Load Current And Voltage Graph

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NOTE: The current status of the measurement is displayed and documented in the indication range.

In the following illustration the USB voltage is 4.92V with a load current of 500mA .

The green line shows the voltage curve during this load increase.

The red line (1) shows the current requested by the IMIB.

Fig 5: Screen Display - USB Connection Load Current And Voltage Graph (Current Status)

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The test finishes automatically after approx. 5 seconds.

Possible fault patterns during the load test

No voltage or no current during the USB test

The USB module cannot be initialized in the IMIB if the USB cable was not connected or there is no voltage supply from the USB port in the vehicle. When this is the case, a message will appear on the IMIB display.

Troubleshooting:

Check USB cable connection between IMIB and vehicle.
Check wires and plug connections in vehicle.
Check the USB connection.
Check control unit.
Check fuse.

Line resistance too high during USB test

Fig 6: Screen Display - High Line Resistance During USB Test

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The curve progression on the green line (1) drops off significantly in the illustration that is displayed. (Voltage less than 3.9 V at 500 mA)

NOTE: With several USB devices, a voltage of around 4 V is not sufficient to guarantee the function. However, the vehicle is trouble-free! In this case, use a different USB device.

Troubleshooting:

Check USB cable connection between IMIB and vehicle (use spare cable from another IMIB if necessary).
Check the USB connection.
Check wires and plug connections in vehicle.

Overloading during the USB test

Fig 7: Screen Display - Overloading During USB Test

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The vehicle is not able to deliver the required level of current. The voltage (1) collapses and the current is thus limited.

Troubleshooting:

The customer may have attached a USB hub (distributor) to the vehicle USB connection. Always run the USB test directly on the USB connection in the vehicle!
Check the USB connection.
Check wires and plug connections in vehicle.
Check control unit.

NOTE: If the test was not successful, a vehicle diagnosis must be carried out with ISTA!

Media test

The IMIB makes various media files available via USB.

Select CD/Multimedia in the menu at the vehicle via the controller.

Fig 8: Screen Display - Select CD/Multimedia

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Then select External Devices.

Fig 9: Screen Display - External Devices Menu

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Change to the <Media test> in the lower part of the IMIB display. Connect the USB cable to the USB port. Press <Start> to start the media test.

Fig 10: Screen Display - Start Media Test

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NOTE: There is still no active data connection between the devices. The vehicle has not yet started the USB connection. The device has not yet appeared on the display of the vehicle.

If the test breaks off at this point after approx. 3 minutes, the IMIB login in the vehicle was not successful.

NOTE: If the test was not successful, a vehicle diagnosis must be carried out with ISTA!

Fig 11: Screen Display - USB Not Connected

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If the connection was successful, the following illustration appears on the IMIB display during the media test. The vehicle has detected the IMIB.

During the test, voltage values are shown continuously on the IMIB display.

The IMIB is displayed on the display of the vehicle as a connected device under the name IMIB SOUND.

Fig 12: Screen Display - IMIB Sound

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{IMIB SOUND} must be selected using the controller in order to display and play the music files. Check volume control in vehicle. A total of 3 media files and a sub-directory ({SubDir}) with contents are offered. To find the

subdirectory, select {IMIB SOUND} and then select Browse directories . In vehicle with a Combox, album cover information is displayed in the form of a illustration as well as the media descriptions (genre, album and track).

Fig 13: Screen Display - IMIB Sound (Browse Directories)

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Fig 14: Screen Display - IMIB Sound Sub-Directory

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The test takes approx. 3 minutes and the progress of the test is indicated by the green bar in the display of the IMIB. It must also be possible to play the music files in the vehicle within those 3 minutes. Pay attention to the volume setting in the vehicle when doing this!

NOTE: On completion of the test, the data link between vehicle and IMIB is terminated automatically. The IMIB is no longer shown on the display of the vehicle as IMIB SOUND .

Media test trouble-free

If the following test conditions have been met:

Voltage within defined limits (greater than or equal to 4.75V)
The data connection was successful

A successfully completed test ends with the display Test completed.

Fig 15: Screen Display - Media Test Completed

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Interruption of test in progress

The ongoing test can be stopped by the user by pressing the <Abort> button. Whenever the test is stopped, no result is then available. When this is the case, a message will appear on the IMIB display. The entire test must be run through in order to obtain a test result.

Fig 16: Screen Display - Media Test Abort Button

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Fig 17: Screen Display - Media Test Start Button

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