Lexus ES manuals

Lexus ES: Terminals Of Ecu

TERMINALS OF ECU

HEATED STEERING WHEEL CONTROLLER (STEERING VIBRATION ECU)

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

HINT:

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

A-1 (GND) - Body ground

Ground

Always

Below 1 Ω

A-3 (LIN2) - Body ground

LIN communication signal

Engine switch on (IG)

Pulse generation

A-4 (IG) - Body ground

IG power supply

Engine switch on (IG)

11 to 14 V

B-1 (SH1) - Body ground

Heater output signal

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

Below 1 V

B-2 (TH1) - Body ground

Thermistor input signal

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

11 to 14 V*1

B-3 (TH2) - Body ground

Thermistor ground

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

2.5 to 4.8 V*2

B-4 (SH3) - Body ground

Heater ground

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

Below 1 V

B-5 (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).

READ NEXT:

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