Multiple Diagnostic Interface 2 User Guide
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Finishing Up
After using the MDI 2, a few simple steps help you leave the vehicle electronic system(s) in the
proper state and ensure that you get the most use out of your diagnostic tools:
1. Before turning the MDI 2 off, exit any running PC computer applications.
2. Turn the MDI 2 off by removing power. The Power LED turns off.
3. Disconnect the MDI 2's DLC cable from the vehicle.
4. Disconnect the USB cable from the PC and the MDI 2.
5. Store the MDI 2, cables, and other parts in a secure, dry location.
SAE J2534 Configuration
The MDI 2 is a SAE J2534 device that connects between your computer and the vehicle’s SAE
J1962 DLC connector for pass-
thru programming of the vehicle’s ECUs. The SAE J2534
Configuration Application is installed on your PC at the same time as the MDI Manager
software, allowing you to keep your OEM PC application connected to a MDI 2. In addition, this
application provides API Monitoring controls to aid in investigating problems encountered while
using any J2534 devices (including the MDI 2).
J2534 Device Configuration Application
The Device Configuration controls in the J2534 Configuration Application allow you to define a
default MDI 2 and a connection sequence that a SAE J2534 compliant PC application will follow
to connect to your MDI 2s. Note: This feature does not apply to PC Applications using the ISO
22900 standard.
The J2534 Config App (MDI) is located in the programs menu: Start>All Programs>General
Motors>GM MDI Software.
There are two controls in this area: the Default Device control and the Auto-Connection Order
control.
The Default Device text box allows you to type the serial number of the MDI 2 that you want to
define as your default device.
The Auto-Connection Order control allows you to select multiple connection methods.
Device on USB
Default Device
Device Explorer
If the box to the left of the method is checked, then the connection method is attempted when
connecting. If the box is not checked, then the connection method is skipped. The connection
methods are attempted sequentially from top to bottom.
To change the order, select a connection method and click the up or down arrow to the right of
the Auto-Connection Order window.
The Device on USB connection method attempts to connect to a MDI 2 via USB, even if that
MDI 2 is not the Default Device.
