If the AGM battery is reconnected or replaced, the ISG system does not operate immediately. If you want to use the system, the battery sensor needs to be calibrated following the procedure.
1. Turn off the engine.
2. Disconnect all electronic devices that were additionally installed after the vehicle was delivered, such as navigation, dashcam, etc.
3. After 4 hours with the engine off, turn the engine on and off 3 to 4 times.
Information
The ISG system may not operate in the following situations.
- There is a malfunction with the ISG
system.
- The battery is weak.
- The brake vacuum pressure is low.
If this occurs, have the vehicle inspected
by an authorized HYUNDAI dealer.
NOTICE
Hyundai Tucson (NX4) 2022-2025 Owner's Manual: Power-assist Brakes
Your vehicle has power-assisted brakes
that adjust automatically through normal
usage.
If the engine is not running or is turned
off while driving, the power assist for
the brakes does not work. You can still
stop your vehicle by applying greater
force to the brake pedal than typical.
...
Hyundai Tucson (NX4) 2022-2025 Service Manual: Description and Operation
- Warning Lamp Activation
Warning Lamp Behavior after Ignition On
As soon as the operating voltage is applied to the SRSCM ignition input,
the SRSCM activates the warning lamp for a LED lamp check.The lamp
shall turn on for 6 seconds during the initialization phase and be
turned off afterw ...