Lexus ES manuals

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.

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

P5-1 (HTR) - P5-10 (GND)

B - LA

Forward recognition with heater hood sub-assembly operation signal

Engine switch on (IG)

Forward recognition with heater hood sub-assembly not operating

11 to 14 V

Engine switch on (IG)

Forward recognition with heater hood sub-assembly operating

Below 1 V

P5-10 (GND) - Body ground

LA - Body ground

Ground

Always

Below 1 Ω

(b) Measure the waveform according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

P5-2 (STRV) - P5-10 (GND)

P - LA

LIN communication signal

Engine switch on (IG)

Pulse generation

(c) 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.

(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.

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.

CHECK STEERING VIBRATION ECU

(a) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

z6-4 (IG) - z6-1 (GND)

Power source

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

z6-1 (GND) - Body ground

Ground

Always

Below 1 Ω

A-1 (M+) - z6-1 (GND)

Steering vibration operation signal

Engine switch on (IG)

Steering vibration operating

Pulse generation

Engine switch on (IG)

Steering vibration not operating

Below 1 V

(b) Measure the waveform according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

z6-2(LIN1) - z6-1(GND)

LIN communication signal

Engine switch on (IG)

Pulse generation

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FREEZE FRAME DATA DESCRIPTION (a) Whenever a front camera system DTC is stored, the forward recognition camera stores the current vehicle state (ECU and sensor information) as Freeze Frame Data. CHECK

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