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 | Power switch on (IG) | Pulse generation |
A-4 (IG) - Body ground | IG power supply | Power switch on (IG) | 11 to 14 V |
B-1 (SH1) - Body ground | Heater output signal | Power switch on (IG), Heated steering wheel system operating | Below 1 V |
B-2 (TH1) - Body ground | Thermistor input signal | Power switch on (IG), Heated steering wheel system operating | 11 to 14 V*1 |
B-3 (TH2) - Body ground | Thermistor ground | Power switch on (IG), Heated steering wheel system operating | 2.5 to 4.8 V*2 |
B-4 (SH3) - Body ground | Heater ground | Power switch on (IG), Heated steering wheel system operating | Below 1 V |
B-5 (SH2) - Body ground | Heater ground | Power switch on (IG), Heated steering wheel system operating | Below 1 V |
HINT:
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*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.
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*2: When ambient temperature is 0 to 40°C (32 to 104°F).
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