Estima/Previa 2001 Non Start (No Cranking)

Have a 2001 Japanese import of Toyota Estima/Previa Chassis No: AHR10002735 which did not crank failing power loss of battery returning from a Hoilday.

• Replaced battery - charged up
• Cleaned out HV battery pack (had blue residue on it)
• Cleaned out battery series terninal connections
• Checked open circuit voltage of all batteries - reading 7.5 volt each battery.
• Checked continuity on wires between fuse link and battery.
• Fuse link shows 2 - 3 ohms reading; should be equal to, or upto 2 ohms.
• Safety switch has a broken lobe to activate micro switch when plugged in which has been temporarily by- passed by bridging the micro switch connector plug.
• Checked all three HV Battery relays - OK
• DTC code now reads: P3140 pointing to an interlock issue - Where is or are the interlock swtich locations?

Any suggestions - help would be very greatly appreciated.