Toyota LAND CRUISER PRADO Owner's Manual page 576

Heated steering wheel (if equipped)
Turns the steering wheel heater
on/off
The indicator light comes on when
the heater is operating.
■ The heated steering wheel can be used when
 Vehicles without a smart entry & start system
The engine switch is in the "ON" position.

Vehicles with a smart entry & start system
The engine switch is in IGNITION ON mode.
■ Timer
The heated steering wheel will automatically turn off after about 30 minutes.
LC150_OM_OM60R93E_(GE)
6-1. Using the air conditioning system and defogger
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6