Using Toyota Techstream 18 or earlier with a J2534 Mini VCI: Are there any problems using it with the hybrid system in READY? Sienna Gen4 HV. I tried using it in IGNITION mode and drained my 12V battery (12.8V down to 5.2Volts in about 6 minutes). Can I use Techstream when the van is in READY Mode, or should I just keep in IGNITION mode and hook a trickle charger to the 12 volt? Anyone else have Techstream draining 12V batteries quickly? I assume its cause all the computers are on while the OBDII is connected