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).
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Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Air Conditioner / T
Fail-safe Chart
FAIL-SAFE CHART DIAGNOSIS FUNCTION
Heated steering wheel controller (steering vibration ECU) has diagnosis function. Condition Detection Condition Response when malfunction detected Recove
Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a pa
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Installation
INSTALLATION CAUTION / NOTICE / HINT CAUTION:
The engine assembly with transaxle is very heavy. Be sure to follow the procedure described in the repair manual, or the engine lifter may suddenly drop or the engine assembly with transaxle may fall off the engine lifter.
To prevent burns, do not t
Voice Guidance does not Function
CAUTION / NOTICE / HINT NOTICE:
Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.
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When replacing the radio receiver assembly, alw
