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The Junction Board is located in the IPU compartment and is attached directly to the Battery Module. Most small components, and the main connections of the high voltage system, are located on the junction board.
The Junction Board itself is not serviceable. If a component attached to the board fails, the Battery Module assembly must be replaced.
When the ignition switch is turned on, the Bypass Contactor is closed first, followed by the High Voltage Contactor. Because current supplied to the MDM initially flows through the Bypass Resistor, a smaller amount of current is applied. This reduces the start-up current spike when the system is first powered up.