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 > Power Mirror Control System (w/ Memory): How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the power mirror control system (w/ Memory).
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT:
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Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Lighting System (w/o Automatic Headlight Beam Level Control System): High Beam Headlight Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the high beam headlights. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network bo ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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- Instrument cluster
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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