GMC MDI 2 User Manual page 27

Multiple Diagnostic Interface 2 User Guide
MDI 2 Speaker is Beeping
If the MDI 2 is performing diagnostic services for the PC and does not detect 12V on Pin 16 of
the DLC cable, the MDI 2 will inform the user of the loss of power by beeping the speaker. This
condition might be seen if the DLC Cable has been removed from the vehicle Data Link
Connector while the MDI 2 is still communicating with GDS2 or Tech2Win application. The MDI
2 will continue to beep until the backup capacitor is drained. When the MDI 2 detects 12V on
Pin 16, the speaker will stop beeping.
Recommendations:
Ensure 12V is applied to Pin 16 of the DLC cable during a diagnostic session
MDI 2 Turns Off Immediately When Disconnected from the Vehicle During a Diagnostic
Session
If the MDI 2 does not remain on during cranking or DLC disconnect, there may be a problem
charging the internal capacitor.
The MDI 2 should remain powered up if power is lost during engine cranking or after it is
disconnected from power (vehicle DLC) during a diagnostic session. The MDI 2 speaker will
beep to notify the user that power has been lost unexpectedly during the diagnostic session.
Recommendations:
Check for 12V power supply at the vehicle DLC connector
Ensure that the MDI 2 has been connected to the vehicle DLC for at least 90 seconds to charge
the internal capacitor.
MDI 2 Checkmark LED is Blinking
If the internal temperature of the MDI 2 has exceeded the maximum limit, the MDI 2 will
automatically turn off the wireless adapter. This will be visible to the user by the Checkmark
LED blinking. When the internal temperature of the MDI 2 lowers to an acceptable value, the
wireless adapter will be re-enabled for wireless communication.
Recommendations:
Move the MDI 2 to a cooler location near the vehicle
Suspected Defective Data Link Connector (DLC) Cable
If you suspect a defective DLC Cable, you should perform the Cable Test from the MDI Manager.
The MDI Manager software supports a DLC Cable Self Test with the use of the Self Test
Adapter. The Cable Test will suggest whether or not the DLC Cable is defective. The
Self Test Adapter used for the test is not intended to be used for vehicle
communication. The following steps can be followed to perform the DLC Cable Test.
1.
Start the MDI Manager software by double-clicking the icon on your desktop.
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