Bunky Posted January 23 Report Share Posted January 23 In the instructions, I assume for my 24 Nautilus Hybrid, I just push start button without pushing the brake so it is in full accessory mode. 3 1 Quote Link to comment Share on other sites More sharing options...
Wubster100 Posted January 23 Report Share Posted January 23 Yes that is right. You are only supposed to reset the BMS after the 12v battery has been replaced. 2 Quote Link to comment Share on other sites More sharing options...
Bunky Posted January 23 Author Report Share Posted January 23 My question was regarding getting to accessory mode since we do not have a key to put in ignition. 2 Quote Link to comment Share on other sites More sharing options...
Haz Posted January 23 Report Share Posted January 23 @Bunky: Yes, per the relevant section of 2024 Nautilus Workshop Manual, attached below in full as a PDF document, you are correct... Good luck! Placing your device cursor over underlined acronyms may yield full-words descriptions of the acronyms: Push Button Ignition Switch The push button ignition switch is used to control the ignition mode. Refer to the following table for information about achieving the various ignition modes. Ignition Entry Condition Desired Ignition Mode Action To Take Off ON (engine off) Press the START/STOP button without applying the brake pedal. Off or on START Apply the brake pedal and then press the START/STOP button. On (engine off) OFF Press the START/STOP button. On (engine running) OFF Press the START/STOP button. Ignition Mode LED Indicator The ignition mode LED indicates the ignition mode of the vehicle. The BCM controls the voltage to the ignition mode LED indicator. Refer to the following table. Ignition Mode Ignition Mode LED Indicator Off Off On (engine off) Flashing On (engine running) On OFF The BCM controls the relays providing voltage to the vehicle electrical systems. When the ignition is in the ON mode, a single press and release of the START/STOP button (without applying the brake pedal) changes the ignition to the OFF mode. No programmed key is required to change the ignition to the OFF mode when the vehicle is running. If the vehicle is in motion, a momentary press of the START/STOP button does not shut the vehicle off. If the vehicle is moving at a speed greater than 15 km/h (9 mph), the START/STOP button must be pressed and held for longer than one second (or pressed 3 times within 2 seconds) to turn the ignition off. When the BCM changes the ignition mode to OFF, it communicates the ignition mode to the other modules by sending an ignition status message over the CAN . ON When the ignition is in the ON mode, the BCM activates the run/start relay to provide voltage to the vehicle electrical systems and communicates the ignition mode to the other modules by sending an ignition status message over the CAN . When the vehicle enters ON mode, multiple indicators in the IPC prove out and the IPC displays the gear selection and the vehicle mileage. START The vehicle temporarily enters the START mode if the brake pedal is applied when the START/STOP button is pressed, and a valid programmed key is detected within the vehicle. In addition to activating the run/start relay, the BCM communicates the ignition mode to the other modules by sending an ignition status message over the CAN . After the ignition has completed the vehicle start sequence, the ignition mode returns to ON and the ignition mode LED in the START/STOP button illuminates steadily. The engine can be started from any ignition mode. Steering Wheel and Column Electrical Components - System Operation and Component Description - 2024 Nautilus Workshop Manual.pdf 1 Quote Link to comment Share on other sites More sharing options...
Bunky Posted January 24 Author Report Share Posted January 24 (edited) I am a Nauti Hybrid owner. I read the document and interesting that if you try to turn off vehicle while moving at 9 mph you have to press and hold or push 3 times. I am not sure what situation would need this (unintended acceleration?) but no driver would know this since I do not think this is in the owners manual. But, repeatedly pushing does sound like something one may try when desparate. The owner's manual calls the ON condition (not with brake applied) as "accessory" and in the vehicle it calls it "Full Accessory Mode" and brielfy displayed briefly on 48 in display. I assume the word "full" is to emphasize the HVAC and other aspects are still active since I am sure it is a huge drain on battery. My question is when in this mode what aspects are powered by 12V battery and what is powered by HV battery? Funny there is no option to get residual charge in HV to jump start the 12V battery. I guess it could be abused and damage the HV battery. Edited January 24 by Bunky 1 Quote Link to comment Share on other sites More sharing options...
Haz Posted January 24 Report Share Posted January 24 (edited) Per your final comment, the Hybrid Nautilus does, in fact, utilize the High Voltage battery pack to service the 12-volt battery and low-voltage vehicle systems. Excerpts from the 2024 Nautilus Workshop Manual, with relevant Workshop Manual sections attached below as a PDF documents... Good luck! High Voltage Battery The high voltage battery consists of cells packaged into modules which deliver approximately 260 volts DC to the high voltage system. The high-voltage DC electrical power is converted to low voltage DC electrical power through the Direct Current/Direct Current (DC/DC) converter control module. This low-voltage high current DC electrical power is then supplied to the 12-volt batteries through the low voltage battery cables. Direct Current/Direct Current (DC/DC) Converter Control Module The DCDC is an liquid-cooled component that converts high voltage DC power to low-voltage (12-volt) DC power. The converter provides power to the vehicle 12-volt battery and low-voltage electrical systems. The PCM requests the DCDC to enable power conversion through an enable message over HS-CAN . The PCM sends a charging voltage setpoint request over HS-CAN to the DCDC . DCDC Operation The DCDC is responsible for maintaining and charging the 12-volt battery. The DCDC is protected by a 50 amp high voltage low current fuse located in the high-voltage BJB . The DCDC steps the high-voltage down to a low-voltage (between 12.0 and 15.5 volts, depending on vehicle needs), providing power to the vehicle low-voltage battery systems. Depending on the vehicle and environmental conditions, the DCDC is capable of outputting up to 260 amps to the 12-volt battery. High Voltage Battery, Mounting and Cables - System Operation and Component Description - 2024 Nautilus Workshop Manual.pdf DCDC Converter Control Module - System Operation and Component Description - 2024 Nautilus Workshop Manual.pdf Climate Control System - System Operation and Component Description - 2024 Nautilus Workshop Manual.pdf Edited January 24 by Haz 2 1 Quote Link to comment Share on other sites More sharing options...
Bunky Posted January 24 Author Report Share Posted January 24 Much to understand but i like the comment that the dcdc can output 260 A to 12V battery yet we have all these battery fails. It could jump ot anytime at least once. I still cannot tell if dcdc is powering everything in Accessory Mode like it is when running. Power is available but at some point it could be drained too. In this case the HV can act like an alternator even in Accessory mode. 1 Quote Link to comment Share on other sites More sharing options...
Bunky Posted January 24 Author Report Share Posted January 24 (edited) I did this test. Voltmeter inserted in center console 12v port Vehicle off 12.4V Vehicle on without pressing brake 13.1V Vehicle on 15.2V One thought it is 13.1V is hv battery via dcdc. The 15.2v definitely means it is charging 12v battery but likely near full charge given high voltage, noco says 14.8 v is best for agm. Edited January 24 by Bunky 1 Quote Link to comment Share on other sites More sharing options...
Bunky Posted January 25 Author Report Share Posted January 25 (edited) i believe now DCDC only deals with the battery. The powering up of everything is handled by a command from BCM to BCMC that has a relay that likely converts from 12v battery operation to HV battery dc to dc conversion if you push the start button (with or without brake pressed) but still seems to support HV battery is powering vehicle in "ON" (without pressing brake). It stated the DCDC controls voltage from 12v to 15v and my readings support. I cannot believe the system would step up the voltage to 13V from the 12V battery. I am on a journey. Edited January 25 by Bunky 1 Quote Link to comment Share on other sites More sharing options...
Haz Posted January 26 Report Share Posted January 26 Wiring diagrams for your journey... Good luck! Charging System Wiring Diagram - 2024 Nautilus FHEV.pdf High Voltage Battery Junction Box to DCDC Wiring Diagram - 2024 Nautilus FHEV.pdf DCDC to Air Conditioning Control Module (ACCM) Wiring Diagram - 2024 Nautilus FHEV.pdf DCDC Power Distribution Wiring Diagram #1 - 2024 Nautilus FHEV.pdf DCDC Power Distribution Wiring Diagram #2 - 2024 Nautilus FHEV.pdf Electronic Engine Controls Wiring Diagram #1 - 2024 Nautilus FHEV.pdf Electronic Engine Controls Wiring Diagram #2 - 2024 Nautilus FHEV.pdf Transmission Controls Wiring Diagram - HF55 - 2024 Nautilus FHEV.pdf Module Communications Wiring Diagram #1 - 2024 Nautilus FHEV.pdf Module Communications Wiring Diagram #2 - 2024 Nautilus FHEV.pdf Module Communications Wiring Diagram #3 - 2024 Nautilus FHEV.pdf 1 Quote Link to comment Share on other sites More sharing options...
Bunky Posted January 26 Author Report Share Posted January 26 (edited) Wow a lot of information. Thanks. Edited January 26 by Bunky Quote Link to comment Share on other sites More sharing options...
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