I searched a few times but wasnt able to locate this in the forums for 2017+ Prius with the tablet style display. ****Do not recommend making any changes or attemptong to access unless you know what you are doing, disclaiming all risk if this bricks your vehicle or display**** Nice to be able to attain the battery status and some other goodies. I prefer the service menu because it appears to give you access to diagnosis mode while diagnosis mode does not give you access to service mode. Have lights set to off/DRL off Then>> While in accessory mode a) service menu 1) press and hold home button 2) flick lights off to tail off to tail off to tail off to tail 3) wait few seconds b) diagnostic menu same as above except hold “menu” button with the little circles instead of home to exit, turn off car all the way (1 or 2 more presses of the car on/off button). I have a feeling there may be other ways to exit the service menu. Once I did this and started the car as normal, I did see a popup about “leaving service mode” or something similar on the map on the display
too bad it doesn't have the ability to disable gps entry. (like the old gen 2 early model up/down/up/down/up touch hack) I mean really... it lets me go in and book movie seats and get table reservations while driving, but not enter gps destination. (mind you i'm not advocating for doing this... I never do this myself, but if I have my wife with me it would be nice to allow her to enter).
Just to add clarification in case the term "tail" is confusing, you can use any two positions on the stalk. Off to Auto or off to DRL or the other selections as long as you do it 4 times.
Is it possible to turn on the video feed option via service mode? Currently we do not have the video feed option enabled for phone mirroring to work.
using this method, is it possible to put the "grille shutter system" in maintenace mode? or is the only way with Techstream? thanks
No. The Navigation Receiver Assembly’s diagnostic mode is only for the navigation and rear view monitor systems; as I wrote before, it is not a general diagnostic or indicating system for the vehicle. The only way to enter Maintenance Mode mentioned in the Repair Manual (more info) is to use the Body Electrical > Grill Shutter > Utility > Grill Shutter Control Mode Switching function of a Toyota Techstream diagnostic system. Once the Grille Shutter System is in Maintenance Mode, driving will restore it to Normal Mode; Toyota writes, “The grille shutter control mode will be changed and initialization will be performed automatically when the vehicle speed exceeds 5 km/h (3 mph).”
Found some new information on this service menu. Has anyone tried downloading the Failure Diagnosis information to a flash drive as described here? https://static.nhtsa.gov/odi/tsbs/2020/MC-10176504-9999.pdf Might help with diagnosing the reboot issues that people have reported.
Under Service Menu > Function Check/Setting > Vehicle Signal, there is supposedly a “Battery” voltage readout, but I believe this actually shows the DC input voltage at the Navigation Receiver Assembly—as you’d expect, since the Service Menu is for diagnosing the multimedia system, not the rest of the car. When the car is in READY, the 12-volt bus is usually energized by the DC-DC converter, not the auxiliary (12-volt) battery. Even in ACC or IG-ON modes, with the DC-DC converter off, the reading is likely to be lower than the voltage at the terminals of the battery under the hood, due to the voltage drop in the wiring. If you want to know the battery voltage, I’d suggest measuring it directly. I keep a Hioki pencil-style digital multimeter (in the special 3246-70 grade with the see-through case, of course) in the car for this purpose, but a Toyota Electrical Tester Set or a $12 multimeter would likely serve just as well. To check on the auxiliary battery management system, you’ll need a Toyota Techstream diagnostic system or equivalent. Related items on the Powertrain > Hybrid Control > Data List page include: DC/DC Converter Operation Status DC/DC Converter Output Voltage Control Mode DC/DC Converter Drive Request Target DC/DC Converter Voltage Auxiliary Battery Voltage Auxiliary Battery Current Smoothed Value of Auxiliary Battery Temperature Auxiliary Battery Voltage Low Times Auxiliary Battery Voltage at Low Voltage Checking Initiation Auxiliary Battery Charging Integrated Current Auxiliary Battery Discharging Integrated Current Auxiliary Battery Capacity after IG ON Auxiliary Battery Capacity after IG OFF Auxiliary Battery Integrated Thermal Load Auxiliary Battery Average Current during IG OFF 1 (2, 3, 4, 5) Trip Before
I use a Bluetooth battery monitor that is connected to the 12v battery post. It monitors 12v battery status 24/7/365, and notifies you via phone app when they need a charge. No need to turn on the car, not even popping the hood open. It uses a very little negligible amount of battery power. During the COVID-19, it has served me very well to make sure the 12v stays healthy.
