Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK WINDSHIELD WIPER MOTOR ASSEMBLY
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(a) Disconnect the A38 windshield wiper motor assembly connector.
(b) Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A38-4 (+B) - Body ground | SB - Body ground | Power switch on (IG) signal (Power source circuit) | Power switch on (IG) | 11 to 14 V |
| Less than approximately 60 seconds after power switch turned off | ||||
| Approximately 60 seconds after power switch turned off | Below 1 V | |||
| A38-1 (GND) - Body ground | LA - Body ground | Ground | Always | Below 1 Ω |
(c) Connect the A38 windshield wiper motor assembly connector.
HINT:
Since the A38 windshield wiper motor assembly connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
(d) Measure the voltage and check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A38-3 (2S) - Body ground | B - Body ground | Windshield wiper motor assembly HI operation signal | Windshield wiper motor assembly stopped | 11 to 14 V |
| Windshield wiper motor assembly operating in HI | Below 1 V | |||
| A38-2 (LIN) - Body ground | R - Body ground | LIN communication signal | Power switch on (IG) | Pulse generation |
CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
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(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
(b) Measure the voltage and resistance according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| 3D-3 - Body ground | LA - Body ground | Ground | Always | Below 1 Ω |
| 3D-23 - Body ground | B - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| 3K-1 - Body ground | W - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
(c) Connect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
(d) Measure the voltage and check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| 3F-2 - Body ground | R - Body ground | Washer circuit IG power source | Power switch on (IG) | 11 to 14 V |
| G36-3 (LIN3) - Body ground | BE - Body ground | LIN communication line | Power switch on (IG) | Pulse generation |
| G36-12 (FWSR) - Body ground | L - Body ground | WASHER Relay operation signal | Power switch on (IG), front washer switch off | 11 to 14 V |
| Power switch on (IG), front washer switch on | Below 2 V | |||
| G37-21 (WPS) - Body ground | LG - Body ground | WIPER Relay operation signal | Power switch on (IG) | 11 to 14 V |
| Less than approximately 60 seconds after power switch turned off | ||||
| Approximately 60 seconds after power switch turned off | Below 1 V |
CHECK RAIN SENSOR (w/ Auto Wiper System)
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(a) Disconnect the P2 rain sensor connector.
(b) Measure the voltage and resistance and check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| P2-2 (ES) - Body ground | L - Body ground | Ground | Always | Below 1 Ω |
| P2-3 (MPX) - Body ground | GR - Body ground | LIN communication signal | Power switch on (IG) | Pulse generation |
| P2-4 (SIG) - Body ground | LG - Body ground | IG power source circuit | Power switch off | Below 1 V |
| Power switch on (IG) | 11 to 14 V |
CHECK COMBINATION METER ASSEMBLY
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READ NEXT:
Dtc Check / Clear
DTC CHECK / CLEAR CHECK FOR DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / (desired system)
Freeze Frame Data
FREEZE FRAME DATA FREEZE FRAME DATA (a) Whenever a DTC is detected, the windshield wiper motor assembly stores the current vehicle state as Freeze Frame Data. CHECK FREEZE FRAME DATA (a) Connect the T
Fail-safe Chart
FAIL-SAFE CHART PROTECTION FUNCTION (a) The windshield wiper motor assembly operates the following protection functions if it detects an abnormal condition, in order to protect the wiper and washer sy
SEE MORE:
Inspection
INSPECTION PROCEDURE 1. INSPECT STEERING COLUMN ASSEMBLY (a) Check that the 2 bushings are securely installed to the steering column assembly. HINT: If the bushings are deformed, missing or damaged, replace the steering column assembly with a new one.
Installation
INSTALLATION PROCEDURE 1. INSTALL TIRE PRESSURE WARNING ECU AND RECEIVER NOTICE:
Do not drop the tire pressure warning ECU and receiver, strike it with tools or subject it to impact.
If the tire pressure warning ECU and receiver is subjected to an impact, replace it with a new one.
(a) Conne
