Lexus ES manuals

Lexus ES: Terminals Of Ecu

TERMINALS OF ECU

CLEARANCE WARNING ECU ASSEMBLY

(a) Disconnect the N41 clearance warning ECU 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

N41-1 (IG) - N41-30 (E)

B - W-B

IG power source signal

Power switch off

Below 1 V

Power switch on (IG)

11 to 14 V

N41-30 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the N41 clearance warning ECU assembly connector.

(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

N41-4 (BOF) - N41-30 (E)

R - W-B

Power source for front sensor circuit

Power switch off

Below 1 V

  • Power switch on (IG)
  • Parking support alert systemt system on

11 to 14 V

N41-6 (E5) - N41-30 (E)

W - W-B

Ground for front clearance sonar

Always

Below 1 Ω

N41-8 (SOF) - N41-30 (E)

B - W-B

Front sensor communication signal (Front clearance sonar sensor)

  • Engine running
  • Parking support alert systemt system on
  • Shift lever in any position other than P or R
  • Vehicle speed is less than approximately 10 km/h (6 mph)

Pulse generation

(Refer to waveform 1)

N41-14 (CBZ) - N41-13 (EF)

LG - L

No. 1 clearance warning buzzer signal

Buzzer sounding

Pulse generation

(Refer to waveform 2)

N41-15 (BBZ) - N41-16 (ER)

G - BE

No. 2 clearance warning buzzer signal

Buzzer sounding

Pulse generation

(Refer to waveform 2)

N41-22 (BOR) - N41-30 (E)

LG - W-B

Power source for rear sensor circuit

Power switch off

Below 1 V

  • Power switch on (IG)
  • Parking support alert systemt system on

11 to 14 V

N41-23 (E1) - N41-30 (E)

GR - W-B

Ground for rear clearance sonar

Always

Below 1 Ω

N41-24 (SOR) - N41-30 (E)

SB - W-B

Rear sensor communication signal (Rear clearance sonar sensor)

  • Engine running
  • Parking support alert systemt system on
  • Shift lever in R
  • Vehicle speed is less than approximately 10 km/h (6 mph)

Pulse generation

(Refer to waveform 1)

N41-28 (STP) - N41-30 (E)*

V - W-B

Reverse signal input

  • Engine running
  • Shift lever in R

11 to 14 V

  • Engine running
  • Shift lever not in R

Below 1 V

N41-31 (IND) - N41-30 (E)*

P - W-B

Display select signal

  • Engine running
  • Shift lever in any position other than P

Below 3 V

  • Engine running
  • Shift lever in P

8 V or higher

  • *: w/o Panoramic View Monitor System

(e) Using an oscilloscope, check waveform 1.

(1) Waveform 1 (Reference)

Item

Content

Measurement terminal

  • CH1: N41-8 (SOF) - N41-30 (E)
  • CH2: N41-24 (SOR) - N41-30 (E)

Measurement setting

5 V/DIV., 1 ms./DIV.

Condition

  • Engine running
  • Parking support alert systemt system on
  • Shift lever in any position other than P or R (CH1)
  • Shift lever in R (CH2)
  • Vehicle speed is less than approximately 10 km/h (6 mph)

HINT:

The waveforms for CH1 and CH2 are same.

(f) Using an oscilloscope, check waveform 2.

(1) Waveform 2 (Reference)

Item

Content

Measurement terminal

N41-14 (CBZ) - N41-13 (EF)

N41-15 (BBZ) - N41-16 (ER)

Measurement setting

2 V/DIV., 500 μs./DIV.

Condition

Buzzer sounding

HINT:

The amplitude of the waveform changes according to the set volume.

BLIND SPOT MONITOR SENSOR RH (w/ Blind Spot Monitor System)

Click here

BLIND SPOT MONITOR SENSOR LH (w/ Blind Spot Monitor System)

Click here

REAR TELEVISION CAMERA ASSEMBLY (w/ Panoramic View Monitor System)

Click here

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