Power Management & Sleep Mode

Because the WiCAN Pro plugs into the OBD2 port, it has constant access to your vehicle's 12V battery. If left running continuously, it will keep your vehicle's CAN bus awake, which can drain your battery over a few days.

To prevent this, the WiCAN Pro features an intelligent Power Saving engine.

Step 1: Enabling Sleep Mode

By default, Sleep Mode should be enabled. You can configure it in the Power Saving tab.

  1. Navigate to the Power Saving tab.
  2. Sleep Mode: Ensure this is set to Enable.
  3. Sleep Voltage: This is the critical threshold. When your engine turns off, the alternator stops charging, and the battery voltage drops. Set this just below your vehicle's running voltage (e.g., 13.2V).
  4. Sleep After: This is the timer. If the voltage drops below your threshold (e.g., 13.2V) and stays there for this amount of time (e.g., 5 min), the WiCAN Pro will go to sleep.

!WARNINGSleep Mode Disabled Warning Disabling sleep mode will continuously drain your vehicle's battery and may cause battery discharge when the vehicle is off. The Web UI will require you to explicitly agree to an "I understand the risks" prompt if you attempt to disable it.

Step 2: Configuring Wakeups

Even while asleep, the WiCAN Pro can periodically wake up to check the vehicle's status (like battery voltage or tire pressure) and send an update over MQTT.

In the Power Saving tab, configure the Wakeup Mode:

  • Disable Wakeups: The device will only wake up when you turn the engine back on and the voltage spikes.
  • Periodic Interval: The device will wake up every X minutes (e.g., 60 min).
  • Scheduled (Time of Day): The device will wake up at specific times (e.g., 12:00 AM). (Note: You must ensure your Local Timezone is set correctly in the System tab for this to work)

Step 3: Low-Voltage Protection for Automate

When the WiCAN Pro wakes up to send a periodic update, you don't want it heavily polling the ECU if your battery is already dangerously low.

  1. Navigate to the Automate tab.
  2. Locate the Low-Voltage Behavior setting.
  3. Select Pause PID polling only (Custom Voltage) or Pause Automate on low voltage.
  4. If using a custom voltage, set the PID Polling Min Voltage slider (e.g., 12.0V).

This ensures that if your battery drops to 12.0V, the WiCAN Pro will still wake up to report the low voltage, but it will skip querying the heavy PIDs, saving precious battery life.

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