Toyota Venza manuals

Toyota Venza: Terminals Of Ecu

TERMINALS OF ECU

1. CLEARANCE WARNING ECU ASSEMBLY


(a) Disconnect the D79 clearance warning ECU assembly connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

D79-9 (CLSW) - D79-30 (E)

B - W

Back sonar or clearance sonar switch assembly power source signal

Engine switch on (IG), clearance sonar main switch on

11 to 14 V

D79-9 (CLSW) - D79-30 (E)

B - W

Back sonar or clearance sonar switch assembly power source signal

Engine switch on (IG), clearance sonar main switch off

Below 1 V

D79-1 (IG) - D79-30 (E)

GR - W

IG power source signal

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

D79-30 (E) - Body ground

W - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the D79 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

D79-22 (BOR) - D79-30 (E)

V - W

Power source for rear sensor circuit

Engine switch off

Below 1 V

Engine switch on (IG), clearance sonar main switch on

7.2 to 8.8 V

D79-8 (SOF) - D79-30 (E)

LG - W

Front sensor communication signal (Front clearance sonar sensor)

Engine switch on (IG), clearance sonar main switch on, shift lever in R

Pulse generation

(See waveform 2)

D79-13 (ER) - D79-30 (E)

Y - W

Clearance warning buzzer signal

Buzzer sounding

Pulse generation

(See waveform 1)

D79-23 (E1) - D79-30 (E)

L - W

Ground for rear clearance sonar

Always

Below 1 V

D79-6 (E5) - D79-30 (E)

BR - W

Ground for front clearance sonar

Always

Below 1 V

D79-4 (BOF) - D79-30 (E)

W - W

Power source for front sensor circuit

Engine switch off

Below 1 V

Engine switch on (IG), clearance sonar main switch on

7.2 to 8.8 V

D79-24 (SOR) - D79-30 (E)

Y - W

Rear sensor communication signal (Rear clearance sonar sensor)

Engine switch on (IG), clearance sonar main switch on, shift lever in R

Pulse generation

(See waveform 2)

(e) Using an oscilloscope, check waveform 1.

(1) Waveform 1 (Reference)


Item

Content

Terminal No. (Symbol)

D79-13 (ER) - D79-30 (E)

Tool Setting

2 V/DIV., 500 μsec./DIV.

Vehicle Condition

When sonar detects obstacle (buzzer sounds)

Buzzer volume

Buzzer sounding

HINT:

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

(f) Using an oscilloscope, check waveform 2.

(1) Waveform 2 (Reference)


Item

Content

Terminal No. (Symbol)

  • CH: 1 D79-8 (SOF) - D79-30 (E)
  • CH: 2 D79-24 (SOR) - D79-30 (E)

Tool Setting

5 V/DIV., 1 msec./DIV.

Condition

Engine switch on (IG), clearance sonar main switch on, shift lever in R

HINT:

The waveforms for CH1 and CH2 are same.

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