Toyota Camry owners & service manuals

Toyota Camry: Terminals Of Ecu

TERMINALS OF ECU

CLEARANCE WARNING ECU ASSEMBLY

(a) Disconnect the R39 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)

Terminal Description

Condition

Specified Condition

R39-1 (IG) - R39-31 (E)

IG power source signal

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

R39-31 (E) - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the R39 clearance warning ECU assembly connector.

(d) Measure the voltage and resistance check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

R39-2 (BOF) - R39-31 (E)

Power source for front sensor circuit

Ignition switch off

Below 1 V

  • Ignition switch ON
  • Intuitive parking assist system on

11 to 14 V

R39-3 (E5) - R39-31 (E)

Ground for front clearance sonar

Always

Below 1 Ω

R39-4 (SOF) - R39-31 (E)

Front sensor communication signal (Front clearance sonar sensor)

  • Ignition switch ON
  • Intuitive parking assist 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)

R39-9 (CBZ) - R39-8 (EF)

No. 1 clearance warning buzzer signal

Buzzer sounding

Pulse generation

(Refer to waveform 2)

R39-19 (BOR) - R39-31 (E)

Power source for rear sensor circuit

Ignition switch off

Below 1 V

  • Ignition switch ON
  • Intuitive parking assist system on

11 to 14 V

R39-20 (E1) - R39-31 (E)

Ground for rear clearance sonar

Always

Below 1 Ω

R39-21 (SOR) - R39-31 (E)

Rear sensor communication signal (Rear clearance sonar sensor)

  • Ignition switch ON
  • Intuitive parking assist system on
  • Shift lever in R
  • Vehicle speed is less than approximately 10 km/h (6 mph)

Pulse generation

(Refer to waveform 1)

(e) Using an oscilloscope, check waveform 1.

(1) Waveform 1 (Reference)

Item

Content

Measurement terminal

  • CH1: R39-4 (SOF) - R39-31 (E)
  • CH2: R39-21 (SOR) - R39-31 (E)

Measurement setting

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

Condition

  • Ignition switch ON
  • Intuitive parking assist 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

R39-9 (CBZ) - R39-8 (EF)

Measurement setting

2 V/DIV., 500 μs./DIV.

Condition

Buzzer sounding

HINT:

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

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