Reprogramming Procedure

CAUTION:
BATTERY VOLTAGE (AS MEASURED AT THE BATTERY POSTS WITHOUT ELECTRICAL LOAD) MUST BE KEPT AT 12.4V OR HIGHER IN ORDER TO REPROGRAM THE ECM. MEASURE THE BATTERY VOLTAGE AND CHARGE AS NECESSARY. A BATTERY CHARGER SHOULD BE CONNECTED TO THE VEHICLE'S BATTERY DURING THE REPROGRAMMING PROCEDURE. DO NOT ALLOW THE BATTERY CHARGER TO TIME OUT.

NOTE:
VCI Stand-alone reprogramming is not available for this procedure. The laptop and the VCI must remain connected for the entire procedure.

Connect the equipment as follows:

^ Connect the A/C adaptor to the laptop and turn the laptop on. REPROGRAMMING THE ECM WITH THE LAPTOP ON BATTERY POWER ONLY IS NOT RECOMMENDED. IF THE PROCEDURE MUST BE CONDUCTED WITH THE LAPTOP RUNNING ON BATTERY POWER ONLY, ENSURE THAT THE BATTERY ICON AT THE LOWER RH CORNER OF THE SCREEN SHOWS THAT THE BATTERY IS AT LEAST 1/2 CHARGED.

^ Connect the USB cable to the VCI.

^ When the laptop displays the MUT-III main screen, connect the USB cable to the laptop.

^ Connect the MUT-III main harness with the blue DLC connection to the VCI.

^ Connect the blue connector of the MUT-III main harness to the vehicles data link connector.

^ Turn the ignition to the ON position.

^ Turn the VCI power switch ON. Verify that the indicator lamp in the upper right corner of the screen is green.





NOTE:
If the USB cable is disconnected during this procedure, a warning message will display. Close the message display by clicking on the OK button and check USB connections.