LEXUS PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CHECK PARKING ASSIST ECU (w/ Side Monitor System)

    A01ESB2E04

    1. Disconnect the F74 and F75 parking assist ECU connectors.

    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
      F74-1 (+B) - F74-4 (GND1) L - W-B Power source signal Always 11 to 14 V
      F74-4 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      F74-8 (IG) - F74-4 (GND1) G - W-B IG power source signal Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      F74-9 (ACC) - F74-4 (GND1) GR - W-B ACC power source signal Engine switch on (ACC) 11 to 14 V
      Engine switch off Below 1 V
      F75-25 (CSSW) - F74-4 (GND1) Y - W-B Back sonar or clearance sonar switch assembly power source signal Engine switch on (IG), back sonar or clearance sonar switch assembly on 11 to 14 V
      Engine switch on (IG), back sonar or clearance sonar switch assembly off Below 1 V

    3. Reconnect the F74 and F75 parking assist ECU connectors.

    4. Measure the voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F74-7 (BBZ) - F74-6 (EF) G - L No. 1 clearance warning buzzer signal Buzzer does not sounding Below 1 V
      Buzzer sounding Pulse generation (See waveform 2)
      F75-3 (LIN2) - F75-4 (CSG2) LG - GR Rear sensor circuit power source Engine switch on (IG), back sonar or clearance sonar switch assembly on Pulse generation (See waveform 1)
      F75-5 (CSB1) - F75-6 (CSG1) GR - R Front sensor circuit power source Engine switch off Below 1 V
      Engine switch on (IG), back sonar or clearance sonar switch assembly on 7.2 to 8.8 V
      F75-20 (CSB2) - F75-4 (CSG2) R - GR Rear sensor circuit power source Engine switch on (IG), back sonar or clearance sonar switch assembly on 7.2 to 8.8 V
      Engine switch off Below 1 V
      F75-23 (LIN1) - F75-6 (CSG1) LG - R Front sensor circuit power source Engine switch on (IG), back sonar or clearance sonar switch assembly on Pulse generation (See waveform 1)
    5. A01ER9KE01

      Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference)
      Item Content
      Terminal No. (Symbol)

      • F75-3 (LIN2) - F75-4 (CSG2)

      • F75-23 (LIN1) - F75-6 (CSG1)
      Tool Setting 2 V/DIV., 1 msec./DIV.
      Condition Engine switch on (IG), back sonar or clearance sonar switch assembly on
    6. A01EQVBE01

      Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference)
      Item Content
      Terminal No. (Symbol) F74-7 (BBZ) - F74-6 (EF)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Buzzer sounding

      Note

      The waveform amplitude varies depending on the volume setting.

  2. CHECK CLEARANCE WARNING ECU ASSEMBLY (w/o Side Monitor System)

    A01ENFPE05

    1. Disconnect the F12 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
      F12-15 (IG) - F12-17 (GND1) G - W-B IG power source signal Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      F12-12 (CSSW) - F12-17 (GND1) Y - W-B Back sonar or clearance sonar switch assembly power source signal Engine switch on (IG), back sonar or clearance sonar switch assembly on 11 to 14 V
      Engine switch on (IG), back sonar or clearance sonar switch assembly off Below 1 V
      F12-17 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the F12 clearance warning ECU assembly connector.

    4. Measure the voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F12-7 (CSB2) - F12-18 (CSG2) R - GR Rear ultrasonic sensor circuit power source Engine switch on (IG), back sonar or clearance sonar switch assembly on 7.2 to 8.8 V
      Engine switch off Below 1 V
      F12-9 (LIN1) - F12-19 (CSG1) LG - R No. 1 ultrasonic sensor circuit power source Engine switch on (IG), back sonar or clearance sonar switch assembly on Pulse generation (See waveform 1
      F12-10 (BBZ) - F12-11 (EF) G - L Clearance warning buzzer signal Buzzer not sounding Below 1 V
      Buzzer sounding Pulse generation (See waveform 2)
      F12-21 (CSB1) - F12-19 (CSG1) GR - R No. 1 ultrasonic sensor circuit power source Engine switch on (IG), back sonar or clearance sonar switch assembly on 7.2 to 8.8 V
      Engine switch off Below 1 V
      F12-24 (LIN2) - F12-18 (CSG2) LG - GR Rear ultrasonic sensor circuit power source Engine switch on (IG), back sonar or clearance sonar switch assembly on Pulse generation (See waveform 1
    5. A01ER9KE01

      Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference)
      Item Content
      Terminal No. (Symbol)

      • F12-9 (LIN1) - F12-19 (CSG1)

      • F12-24 (LIN2) - F12-18 (CSG2)
      Tool Setting 2 V/DIV., 1 msec./DIV.
      Condition Engine switch on (IG), back sonar or clearance sonar switch assembly on
    6. A01EQVBE01

      Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference)
      Item Content
      Terminal No. (Symbol) F12-10 (BBZ) - F12-11 (EF)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Buzzer sounding

      Note

      The waveform amplitude varies depending on the volume setting.