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. If the MDI 2 does not remain on during cranking or DLC disconnect, there may be a problem charging the internal capacitor. MDI 2 Turns Off Immediately When Disconnected from the Vehicle During a Diagnostic Session When the MDI 2 detects 12V on Pin 16, the speaker will stop beeping.Įnsure 12V is applied to Pin 16 of the DLC cable during a diagnostic session The MDI 2 will continue to beep until the backup capacitor is drained.
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.
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. When the MDI 2 detects 12V on Pin 16, the Vehicle LED will stop blinking red.Įnsure 12V is applied to Pin 16 of the DLC cable This condition might be seen if the MDI 2 is only powered by a 5V USB connection or if the DLC Cable has accidently been displaced from the vehicle Data Link Connector and is powered from the backup capacitor. If the MDI 2 does not detect 12V on Pin 16 of the DLC cable, the MDI 2 will inform the user by automatically turning on and blinking the Vehicle LED red. If connecting to the vehicle DLC connector, try powering via USB. Try supplying power to the MDI 2 from different power sources- the vehicle DLC connector or USB.Ĭheck that the cables are securely attached to the MDI 2 and the connector pins are clean. If the MDI 2 does not turn on, first check the power cable connections. The MDI 2 should power up as soon as external power is applied. Connect the MDI 2 to a PC using USB and perform the recovery procedure. Power down the MDI 2 and verify that it has the same problem when you power up again. Most Likely Cause: Internal problem in the MDI 2.Ĭonnect the MDI 2 to a PC using USB and perform the recovery procedure.Ī problem has been detected during power on. MDI 2 Does Not Pass Power On Self-Test (POST) In addition, the most likely cause for the condition is given as well as other possible causes and recommendations on how to isolate or eliminate the problem. This section is intended to help you get back on track if the GM MDI 2 appears to be operating abnormally.
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