System Description - Electric Power Steering System: Description

Normal Control 

• The heated steering wheel system maintains the surface temperature of the steering wheel between 20 deg. C (68 deg. F) and 30 deg. C (86 deg. F).
• Once steering heater function turns ON on the integral switch display, A/C auto amp. that has received signal via display control unit turns the heated steering wheel relay ON and electrifies to the heat elements built-in the steering wheel to heat the steering wheel.
• When steering heater function turns OFF, A/C auto amp. turns OFF the heated steering wheel relay and stops the electricity supply to the heat elements.
• When the surface temperature of the steering wheel is higher than 30 deg. C (86 deg. F), the thermostat built-in the steering wheel turns OFF, and electricity to the heating element is turned OFF. When the surface temperature drops to less than 20 deg. C (68 deg. F), the thermostat built-in the steering wheel turns ON, and electricity to the heating element is turned ON.

Auto Control 

• Once steering heater auto function turns ON on the integral switch display part, the steering heater switches to the auto control.
• Under the auto control, A/C auto amp. turns the heated steering wheel relay ON and electrifies the heat elements built in the steering wheel to heat the steering wheel when the temperature in the passenger room is low.
• After the heated steering wheel relay turns ON, the electricity to the heat element switches ON/OFF corresponding to the steering wheel surface temperature as well as under the normal control.
• If ON<=>OFF operation of "Steering Heater" is performed on the integral switch display, the auto control is cancelled.

Timer Function 

• The A/C auto amp. has a timer. After steering heater function or steering heater auto function turns ON, when operating time becomes more than the specified time (30 minutes), the A/C auto amp. turns OFF the heated steering wheel relay to stop heating.

Condition for Electrifying Heat Elements