Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
NOTICE:
- DTCs may be output when connectors are disconnected during inspection. Therefore, be sure to clear the DTCs using the Techstream once the inspection has been completed.
- Do not apply excessive force to the forward recognition camera connector.
.png)
CHECK FORWARD RECOGNITION CAMERA
(a) Measure the voltage and resistance according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| P5-7 (IGB) - P5-10 (GND) | LA-P - LA | Power source | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| P5-3 (LKSW) - P5-10 (GND) | BE - LA | Steering pad switch signal (LTA/LDA main switch signal) | Power switch off LTA/LDA main switch off | 1 MΩ or higher |
| Power switch off LTA/LDA main switch on | 228 to 252 Ω | |||
| P5-10 (GND) - Body ground | LA - Body ground | Ground | Always | Below 1 Ω |
(b) Check for pulses according to the value(s) in the table below.
HINT:
If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the forward recognition camera is suspected.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| P5-5 (CA1P) - P5-10 (GND) | L - LA | CAN communication signal | Power switch on (IG) | Pulse generation (See waveform 1) |
| P5-11 (CA1N) - P5-10 (GND) | W - LA | CAN communication signal | Power switch on (IG) | Pulse generation (See waveform 2) |
| P5-6 (CANH) - P5-10 (GND) | B - LA | CAN communication signal | Power switch on (IG) | Pulse generation (See waveform 1) |
| P5-12 (CANL) - P5-10 (GND) | W - LA | CAN communication signal | Power switch on (IG) | Pulse generation (See waveform 2) |
(1) WAVEFORM 1
| Item | Content |
|---|---|
| Terminal Name | Between P5-5 (CA1P) and P5-10 (GND) Between P5-6 (CANH) and P5-10 (GND) |
| Tester Range | 1 V/DIV., 10 μs/DIV. |
| Condition | Power switch on (IG) |
HINT:
The waveform varies depending on the CAN communication signal.
.png)
(2) WAVEFORM 2
| Item | Content |
|---|---|
| Terminal Name | Between P5-11 (CA1N) and P5-10 (GND) Between P5-12 (CANL) and P5-10 (GND) |
| Tester Range | 1 V/DIV., 10 μs/DIV. |
| Condition | Power switch on (IG) |
HINT:
The waveform varies depending on the CAN communication signal.
.png)
READ NEXT:
Diagnosis System
DIAGNOSIS SYSTEM FUNCTION OF INDICATOR AND WARNING MESSAGE (a) If the lane control system is not functioning properly, the driver is warned through the LTA indicator and a warning message is displayed
Dtc Check / Clear
DTC CHECK / CLEAR CHECK 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: Chassis / Lane Control / Trouble Codes
Fail-safe Chart
FAIL-SAFE CHART FAIL-SAFE FUNCTION (a) When a malfunction occurs in the lane control system, a message will be displayed on the multi-information display and, depending on the malfunction, functions o
SEE MORE:
DC/DC Converter Stuck On (P0A949E,P0D3319)
DTC SUMMARY MALFUNCTION DESCRIPTION This DTC indicates that a large current flowed in the boost converter. The cause of this malfunction may be one of the following: Area Main Malfunction Description Hybrid vehicle transaxle assembly
Open or short circuit in the motor or generator coil
Inspection
INSPECTION PROCEDURE 1. INSPECT HAZARD WARNING SIGNAL SWITCH ASSEMBLY *a Component without harness connected (Hazard Warning Signal Switch Assembly) (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Co
