TOYOTA PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU

  1. CHECK CLEARANCE WARNING ECU ASSEMBLY

    C309508N04

    1. Measure the voltage and resistance and check for pulse signals according to the value(s) in the table below.

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      G166-22 (BOR) - G166-30 (E)

      R - W-B

      Power source for rear sensor circuit

      Power switch off

      Below 1.5 V

      Power switch on (IG), TOYOTA parking assist-sensor system on

      7.2 to 8.8 V

      G166-8 (SOF) - G166-30 (E)

      G - W-B

      Front sensor communication signal (Front clearance sonar sensor)

      Power switch on (IG), TOYOTA parking assist-sensor system on, shift lever in R

      Pulse generation

      (See waveform 2)

      G166-14 (CBZ) - G166-30 (E)

      LG - W-B

      Clearance warning buzzer signal

      Power switch off

      Below 1.5 V

      Power switch on (IG), TOYOTA parking assist-sensor system on

      11 to 14 V

      G166-13 (EF) - G166-30 (E)

      GR - W-B

      Ground for clearance warning buzzer

      When sonar detects obstacle (Buzzer sounds)

      Pulse generation

      (See waveform 1)

      G166-1 (IG) - G166-30 (E)

      B - W-B

      IG power source signal

      Power switch off

      Below 1.5 V

      Power switch on (IG)

      11 to 14 V

      G166-30 (E) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

      G166-23 (E1) - G166-30 (E)

      W - W-B

      Ground for rear clearance sonar

      Always

      Below 1 Ω

      G166-6 (E5) - G166-30 (E)

      P - W-B

      Ground for front clearance sonar

      Always

      Below 1 Ω

      G166-4 (BOF) - G166-30 (E)

      V - W-B

      Power source for front sensor circuit

      Power switch off

      Below 1.5 V

      Power switch on (IG), TOYOTA parking assist-sensor system on

      7.2 to 8.8 V

      G166-24 (SOR) - G166-30 (E)

      P - W-B

      Rear sensor communication signal (Rear clearance sonar sensor)

      Power switch on (IG), TOYOTA parking assist-sensor system on, shift lever in R

      Pulse generation

      (See waveform 2)
    2. E168464E01

      Using an oscilloscope, check waveform 1.

      Table 1. Measurement Condition

      Item

      Content

      Terminal No. (Symbol)

      G166-13 (EF) - G166-30 (E)

      Tool Setting

      2 V/DIV., 500 μsec./DIV.

      Vehicle Condition

      When sonar detects obstacle (Buzzer sounds)
    3. E168463E02

      Using an oscilloscope, check waveform 2.

      Table 2. Measurement Condition

      Item

      Content

      Terminal No. (Symbol)

      • CH: 1 G166-8 (SOF) - G166-30 (E)

      • CH: 2 G166-24 (SOR) - G166-30 (E)

      Tool Setting

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

      Condition

      Power switch on (IG), TOYOTA parking assist-sensor system on, shift lever in R