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.
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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 | Engine switch on (IG) | 11 to 14 V |
| Engine switch off | Below 1 V | |||
| 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 | Engine switch on (IG) | Pulse generation (See waveform 1) |
| P5-11 (CA1N) - P5-10 (GND) | W - LA | CAN communication signal | Engine switch on (IG) | Pulse generation (See waveform 2) |
| P5-6 (CANH) - P5-10 (GND) | B - LA | CAN communication signal | Engine switch on (IG) | Pulse generation (See waveform 1) |
| P5-12 (CANL) - P5-10 (GND) | W - LA | CAN communication signal | Engine 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 | Engine switch on (IG) |
HINT:
The waveform varies depending on the CAN communication signal.
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(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 | Engine switch on (IG) |
HINT:
The waveform varies depending on the CAN communication signal.
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READ NEXT:
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 > Road Sign Assist
Freeze Frame Data
FREEZE FRAME DATA DESCRIPTION (a) Whenever a road sign assist system DTC is stored, the forward recognition camera stores the current vehicle state (ECU and sensor information) as Freeze Frame Data. C
Fail-safe Chart
FAIL-SAFE CHART FAIL-SAFE FUNCTION (a) When a malfunction occurs in the road sign assist system, a message will be displayed on the multi-information display and the road sign assist system will be di
SEE MORE:
Lost Communication With Body Control Module "B" (U0142)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area U0142 Lost Communication with Main Body ECU No communication with main body ECU (multiplex network body ECU)
CAN communication system
Main body ECU (multiplex network body ECU)
PROCEDURE 1. GO
Distance Control Switch Circuit
DESCRIPTION The vehicle-to-vehicle distance control switch is used to set the distance for vehicle-to-vehicle distance control mode. The vehicle-to-vehicle distance control switch is installed in the steering pad switch assembly. The vehicle-to-vehicle distance set value can be changed by operating
