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 engine 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 brake 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)

  • Power switch on (IG)
  • Parking support brake 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 brake 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)

  • Power switch on (IG)
  • Parking support brake system on
  • Shift lever in R
  • Vehicle speed is less than approximately 10 km/h (6 mph)

Pulse generation

(Refer to waveform 3)

(e) Using an oscilloscope, check waveform 1.

(1) Waveform 1 (Reference)

Item

Content

Measurement terminal

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

Measurement setting

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

Condition

  • Power switch on (IG)
  • Parking support brake system on
  • Shift lever in any position other than P or R
  • Vehicle speed is less than approximately 10 km/h (6 mph)

(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.

(g) Using an oscilloscope, check waveform 3.

(1) Waveform 3 (Reference)

Item

Content

Measurement terminal

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

Measurement setting

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

Condition

  • Power switch on (IG)
  • Parking support brake system on
  • Shift lever in R
  • Vehicle speed is less than approximately 10 km/h (6 mph)

COMBINATION METER ASSEMBLY

Click here

HYBRID VEHICLE CONTROL ECU ASSEMBLY

Click here

BLIND SPOT MONITOR SENSOR

Click here

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

Click here

READ NEXT:

 Control Module Communication Bus "A" Off (U0073,U0100,U0124,U0126,U0129,U0140,U0155,U0164,U0265)

DESCRIPTION These DTCs are stored if there is a malfunction in the CAN communication system connected to the clearance warning ECU assembly. HINT: If CAN communication system DTCs are stored, they may

 Lost Communication with Blind Spot Monitor Slave Module (U0232,U0233)

DESCRIPTION This DTC is stored when the blind spot monitor sensor LH judges that there is a communication problem with the blind spot monitor sensor RH. DTC No. Detection Item DTC Detection Con

 CAN Communication Failure (Message Registry) (U1000)

DESCRIPTION When the clearance warning ECU assembly determines that the CAN communication circuit is malfunctioning during self diagnosis, DTC U1000 is stored. DTC No. Detection Item DTC Detect

SEE MORE:

 Reassembly

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 Precaution

PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL NOTICE: When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following systems after the cable is reconnected. System Name See Procedure Lane Control System (for H

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