Lexus NX450h+ 2021 - When the Horn Sounds at a Low Volume and the Hybrid System Cannot be Started

When the horn sounds at a low volume and the hybrid system cannot be
started
Cause Remedy
The 12-volt battery may be dis-
charged.
Restarting the hybrid system using the
jumper (or booster) cables.
The 12-volt battery terminal connec-
tions may be loose or corroded.
The 12-volt battery terminals may be loose
or corroded.
Related Links
If the vehicle 12-volt battery is discharged(P. 696)
Restarting the hybrid system when the 12-volt battery is discharged(P. 726)
If the vehicle 12-volt battery is discharged(P. 696)
9-3. If the hybrid system will not start
704