TOYOTA PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU

  1. CLEARANCE WARNING ECU ASSEMBLY

    E270534E01

    1. Disconnect the G33 clearance warning ECU assembly connector.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      G33-11 (IG) - G33-16 (E)

      G - W-B

      Telltale light assembly (clearance sonar main switch) power source signal

      Ignition switch ON, telltale light assembly (clearance sonar main switch) on

      11 to 14 V

      G33-11 (IG) - G33-16 (E)

      G - W-B

      Telltale light assembly (clearance sonar main switch) power source signal

      Ignition switch ON, telltale light assembly (clearance sonar main switch) off

      Below 1 V

      G33-16 (E) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

    3. Reconnect the G33 clearance warning ECU assembly connector.

    4. 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

      G33-1 (BBZ) - G33-2 (ER)

      LG - GR

      No. 1 clearance warning buzzer signal

      Buzzer sounding

      Pulse generation

      (See waveform 1)

      Buzzer not sounding

      11 to 14 V

      G33-7 (L1) - G33-16 (E)

      V - W-B

      Rear corner sensor RH indicator signal

      Clearance warning indicator LED for rear corner sensor RH illuminates

      Below 3 V

      G33-8 (L2) - G33-16 (E)

      P - W-B

      Rear corner sensor LH indicator signal

      Clearance warning indicator LED for rear corner sensor LH illuminates

      Below 3 V

      G33-10 (L10) - G33-16 (E)

      BR - W-B

      Vehicle LED indicator signal

      Clearance warning indicator LED for vehicle LED illuminates

      Below 3 V

      G33-12 (BOR) - G33-16 (E)

      R - W-B

      Power source for rear sensor circuit

      Ignition switch off

      Below 1 V

      Ignition switch ON, clearance sonar main switch on

      7.2 to 8.8 V

      G33-13 (E1) - G33-16 (E)

      W - W-B

      Ground rear clearance sonar

      Always

      Below 1 V

      G33-14 (SOR) - G33-16 (E)

      P - W-B

      Rear sensor communication signal (Rear corner sensor)

      Ignition switch ON, telltale light assembly (clearance sonar main switch) on, shift lever in R

      Pulse generation

      (See waveform 2)

      G33-20 (TL) - G33-16 (E)

      BR - W-B

      Illumination signal

      Ignition switch ON, light control switch off

      Below 1 V

      Ignition switch ON, light control switch on

      11 to 14 V

      G33-21 (RL) - G33-16 (E)

      V - W-B

      Reverse signal

      Ignition switch ON, shift lever in R

      7 V or higher

      Ignition switch ON, shift lever not in R

      Below 1 V

      G33-23 (L3) - G33-16 (E)

      L - W-B

      Rear center sensor indicator signal

      Clearance warning indicator LED for rear center sensor illuminates

      Below 3 V

    5. Using an oscilloscope, check waveform 1.

      1. E227014E01

        Waveform 1 (Reference)

        Item

        Content

        Terminal No. (Symbol)

        G33-13 (E1) - G33-16 (E)

        Tool Setting

        2 V/DIV., 500 μsec./DIV.

        Vehicle Condition

        When sonar detects obstacle (buzzer sounds)

    6. Using an oscilloscope, check waveform 2.

      1. E235241E01

        Waveform 2 (Reference)

        Item

        Content

        Terminal No. (Symbol)

        G33-14 (SOR) - G33-16 (E)

        Tool Setting

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

        Condition

        Ignition switch ON, telltale light assembly (clearance sonar main switch) on, shift lever in R