Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: System Description
SYSTEM DESCRIPTION
HEATED STEERING WHEEL SYSTEM
(a) The heated steering wheel system heats the steering wheel assembly when the steering heater switch (Integration control and panel assembly) is operated.
(b) The heated steering wheel system uses a thermistor inside of the steering wheel assembly to detect the heater temperature and maintain the set temperature.
(c) The heated steering wheel timer function turns off the heater after a predetermined period of time.
HEATER CONTROLLER SYSTEM
(a) Operation description
(1) When the engine switch is on (IG), pressing the steering heater switch (integration control and panel assembly) operates the heated steering wheel system.When the heated steering wheel system is operating, the steering vibration and heater ECU illuminates the indicator LED and sends current to the steering wheel heater unit of the heated steering wheel system. Pressing the steering heater switch (integration control and panel assembly) again stops operation of the heated steering wheel system.
(2) A thermostat is installed in the steering wheel heater unit as a safety mechanism.
(3) The steering heater switch (integration control and panel assembly) LED turns off when either of the following occurs:
- An open or short in the steering wheel heater unit thermistor continues for 2 seconds or more.
- The steering heater switch (integration control and panel assembly) is pressed continuously for 10 seconds or more.
(4) The timer will turn off the heater 30 minutes after the steering heater switch was first turned on.
(b) Signal input / output description
| Signal | Signal Name | Function |
|---|---|---|
| Input | Thermistor input | Input of voltage corresponding to heater temperature |
| Input | Operating switch input | Input of power circuit operation estimate signal |
| Output | LED output | Output of LED |
| Output | Drive current output | Output of drive current |
Steering Wheel does not Heat Up When Heated Steering Wheel Switch is Pressed
DESCRIPTION Click here WIRING DIAGRAM CAUTION / NOTICE / HINT HINT:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
The steering whe ...
System Diagram
SYSTEM DIAGRAM SYSTEM DIAGRAM ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Integration Relay: Inspection
INSPECTION PROCEDURE 1. INSPECT SEMICONDUCTOR POWER INTEGRATION ECU (a) IG2 RELAY: (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition B-1 - 1F-4 Battery voltage not applied between terminals ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Steering Gear: Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE STEERING RACK BOOT CLIP (for LH Side) (a) Using pliers, remove the steering rack boot clip. 2. REMOVE STEERING RACK BOOT CLIP (for RH Side) HINT: Perform the same procedure as for the LH side. 3. REMOVE NO. 2 STEERING RACK BOOT CLAMP (for LH Side) (a) Using a screw ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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