Vehicle Wake, Sleep, Accessory, And Retained-Power States

Canonical definition: Vehicle wake and sleep behavior is the coordinated transition of power rails, network transceivers, gateways, modules, audio sources, DSPs, amplifiers, retained-accessory functions, user controls, and protection states.

Build The State Matrix

State	Required audio and network record
vehicle off / standby	parked current, transceiver state, stored preset, wake sources
accessory / retained accessory	source availability, user controls, amplifier state, timeout
run	normal source, charging, network, DSP, amplifier, and retained functions
crank / stop-start / brownout	voltage, reset, mute, output, communication, restored state
shutdown	amplifier disable, output mute, state save, interface and network sleep
wake	source of wake, modules awakened, boot order, audio enable, user state
fault / update / disconnect	safe default, logging, bypass, recovery, service access

Audio Enable Sequence

power stable
→ controller and DSP reset / self-boot
→ verify project and communication
→ load or confirm protected preset
→ keep outputs muted
→ enable amplifier remote
→ confirm amplifier ready
→ slew audio to approved level

Shutdown reverses the risk: slew or mute audio first, disable amplifiers, preserve required state, then allow the controller, transceiver, and network to sleep.

Wake Sources Are System Inputs

key or accessory signal
door, lock, retained-accessory, or body-network activity
CAN or LIN wake pattern
audio or DC-offset sensing
phone, Bluetooth, USB, charger, diagnostic, or update connection
local button, timer, or controller watchdog

Each wake source needs an owner, allowed states, timeout, failure behavior, and parked-current result.

Parked-Current Measurement

Configure the vehicle, keys, doors, locks, chargers, phone, and test equipment.
Measure from key-off through the complete delayed-sleep period.
Avoid opening doors, polling modules, or reading instruments in ways that restart the timer.
Record step changes and identify which interface or module owns each one.
Repeat after reconnect, fault, update, and normal user operation.

Common Back-Power Paths

USB programmer or laptop ground
signal cable between separately powered devices
microcontroller GPIO into an unpowered DSP or transceiver
remote-turn-on wiring
diagnostic adapter
unpowered network transceiver that is not passive on the bus

Audio off is not vehicle asleep.

Release requires measured final sleep, stable parked current, correct wake behavior, protected crank and brownout handling, and reliable restoration of the approved source and preset state.