Toyota C-HR 2017 Owner's Manual page 579

Seat heaters
Each time the switch is pressed,
the operation condition changes
as follows.
Hi (3 segments lit)  Mid (2 seg-
ments lit)  Lo (1 segment lit) 
Off
The level indicator (amber) light up
during operation.
■ Operating condition
Vehicles without a smart entry & start system

The seat heaters can be used when the engine switch is in the "ON" position.
Vehicles with a smart entry & start system

The seat heaters can be used when the engine switch is in IGNITION ON
mode.
C-HR_OM_Europe_OM10528E
6-1. Using the air conditioning system and defogger
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