Heated Steering Wheel System System Description

  1. HEATED STEERING WHEEL SYSTEM

  1. HEATER CONTROLLER SYSTEM

Heated Steering Wheel System -- System Description



HEATED STEERING WHEEL SYSTEM

  1. The heated steering wheel system heats the steering wheel when the steering heater switch is operated.

  2. The heated steering wheel system uses a thermistor inside of the steering wheel to detect the heater temperature and maintain the set temperature.

  3. The timer function of the heated steering wheel system turns off the heater after a predetermined period of time.


HEATER CONTROLLER SYSTEM


  1. Operation description


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Steering Column.Power Tilt And Power Telescopic Steering Column System.Heated Steering Wheel System System Description


    1. When the engine switch is on (IG), pressing the steering heater switch illuminates the LED and causes current to be output from the steering controller to the heater of the heated steering wheel. Pressing the steering heater switch again turns off the LED and stops the current from being output.

    2. A thermostat is installed in the steering wheel as a safety mechanism.

    3. The steering heater switch LED will turn off when either of the following occurs: 1) an open or short in the steering wheel thermistor continues for 2 seconds or more; or 2) the steering heater switch is pressed continuously for 10 seconds or more.

    4. If the system returns to normal for 2 seconds or more, the previous operation before the malfunction occurred continues. However, regardless of if a malfunction is detected and the malfunction operation is occurring, or if the system returns to normal, the timer will turn off the heater 30 minutes after the switch was first turned on.



  2. Signal input/output description


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Steering Column.Power Tilt And Power Telescopic Steering Column System.Heated Steering Wheel System System Description


    Signal
    		Signal Name
    		Function
    		Signal Type
    Input
    		Thermistor input
    		Input of voltage corresponding to heater temperature
    		Analog input
    Input
    		Temperature setting input
    		Input of voltage corresponding to temperature setting
    		Analog input
    Input
    		Switch operation input
    		Input of power circuit's latch operation estimate signal
    		LOW/HI input
    Output
    		LED output
    		Output to LED
    		LOW/HI output
    Output
    		Heater output
    		Output to heater
    		LOW/HI output
    Output
    		Latch output
    		Power circuit maintenance
    		LOW/HI output

  3. Safety function

    Content
    		Operation
    When thermistor trouble is detected
    		Heater turns off
    When overheating (175°C (347°F)) of controller is detected
    		Heater turns off
    When load short current (50 A or more) is detected
    		Heater turns off
    When undervoltage (4.5 V) is detected
    		Heater turns off
    OFF timer (30 min.)
    		After preset time of timer passes, heater off
    Reverse voltage protection
    		Protection circuit operates