So if the main (+) is not commanded to come ON, then it may be an issue inside the EV-ECU under the rear seat that sends the coil drive signals to the Pack.
The (+) drive is on pin 107 of connector C-111. It should have 12V on that line with key at ON, and drop to 1V or less after the key goes to START. pin 106 is for the (-) contactor, and has the same key ON and START voltage response, so if it is coming ON, then monitor that and compare with the response of the (+).
Do you know if the car might have had a sudden shutdown event or power hiccup while driving? The main (+) contacts may be frosted over and not conducting if the coil drive was removed while current was flowing thru the contacts--this would cause a large DC arc inside the contactor and damage the precious metal surfaces of the contacts. Possible cause would be weak or failed 12V aux battery.
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