Lexus NX: Terminals Of Ecu
TERMINALS OF ECU
HINT:
Perform the inspection from the harness side with the connectors connected.
STEERING HEATER AND VIBRATION ECU
(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 | Power switch on (IG) | 11 to 14 V |
| A-3 (SW) - Body ground | Steering heater switch input signal | Power switch on (IG), steering heater switch pressed and held | 11 to 14 V |
| A-2 (LED) - Body ground | LED output signal | Power 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 | Power switch on (IG), Heated steering wheel system operating | 11 to 14 V(*1) |
| B-3 (TH1) - Body ground | Thermistor input signal | Power switch on (IG), Heated steering wheel system operating | 2.5 to 4.8 V(*2) |
| B-2 (TH2) - Body ground | Thermistor ground | Power switch on (IG), Heated steering wheel system operating | Below 1 V |
| B-1 (SH2) - Body ground | Heater ground | Power 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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Fail-safe Chart
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