Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

STEERING WHEEL HEATER CONTROL ASSEMBLY

HINT:

Perform the inspection from the harness side with the connectors connected.

(a) Measure the voltage or resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

A-4 (IG) - Body ground

IG power supply

Engine switch on (IG)

11 to 14 V

A-3 (SW) - Body ground

Steering heater switch (Integration control&panel assembly) input signal

Engine switch on (IG), Steering heater switch (Integration control&panel assembly) pressed and held

11 to 14 V

A-2 (LED) - Body ground

LED output signal

Engine switch on (IG), Heated steering wheel system operating

Below 3 V

A-1 (GND) - Body ground

Ground

Always

Below 1 Ω

B-5 (SH1) - Body ground

Heater output signal

Engine switch on (IG), Heated steering wheel system operating

11 to 14 V*1

B-3 (TH1) - Body ground

Thermistor input signal

Engine switch on (IG), Heated steering wheel system operating on at 0 to 40°C (32 to 104°F)

2.5 to 4.8 V*2

B-2 (TH2) - Body ground

Thermistor ground

Engine switch on (IG), Heated steering wheel system operating

Below 1 V

B-1 (SH2) - Body ground

Heater ground

Engine switch on (IG), Heated steering wheel system operating

Below 1 V

HINT:

  • *1: The current to the heater turns ON/OFF depending on the temperature of the thermistor. As a result, it may take several minutes before a voltage value is output.
  • *2: When ambient temperature is 0 to 40°C (32 to 104°F).
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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

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