LEXUS PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CHECK CLEARANCE WARNING ECU ASSEMBLY

    A01WQ4PE03

    1. Disconnect the F92 clearance warning ECU assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F92-9 (CLSW) - F92-30 (E) W - BR Main switch assembly (clearance sonar main switch) power source signal Engine switch on (IG), main switch assembly (clearance sonar main switch) on 11 to 14 V
      Engine switch on (IG), main switch assembly (clearance sonar main switch) off Below 1 V
      F92-1 (IG) - F92-30 (E) B - BR IG power source signal Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      F92-30 (E) - Body ground BR - Body ground ECU ground Always Below 1 Ω

    3. Reconnect the F92 clearance warning ECU assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F92-22 (BOR) - F92-23 (E1) R - GR Rear ultrasonic sensor circuit power source Engine switch off Below 1 V
      Engine switch on (IG), main switch assembly (clearance sonar main switch) on 7.2 to 8.8 V
      F92-8 (SOF) - F92-6 (E5) LG - R No. 1 ultrasonic sensor communication signal Engine switch on (IG), main switch assembly (clearance sonar main switch) on Waveform 1
      F92-14 (CBZ) - F92-13 (EF) G - L No. 1 clearance warning buzzer signal Buzzer not sounding Below 1 V
      Buzzer sounding Waveform 2
      F92-4 (BOF) - F92-6 (E5) GR - R No. 1 ultrasonic sensor circuit power source Engine switch on (IG), main switch assembly (clearance sonar main switch) on 7.2 to 8.8 V
      Engine switch off Below 1 V
      F92-24 (SOR) - F92-23 (E1) LG - GR Rear ultrasonic sensor communication signal Engine switch on (IG), main switch assembly (clearance sonar main switch) on Waveform 3
    5. A01WT8JE02

      Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference)
      Item Content
      Terminal No. (Symbol) F92-8 (SOF) - F92-6 (E5)
      Tool Setting 2 V/DIV., 1 msec./DIV.
      Condition Engine switch on (IG), main switch assembly (clearance sonar main switch) on
    6. A01WWOME02

      Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference)
      Item Content
      Terminal No. (Symbol) F92-14 (CBZ) - F92-13 (EF)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Buzzer sounding

      Note

      The waveform amplitude varies depending on the volume setting.

    7. A01WT8JE02

      Using an oscilloscope, check waveform 3.

      Waveform 1 (Reference)
      Item Content
      Terminal No. (Symbol) F92-24 (SOR) - F92-23 (E1)
      Tool Setting 5 V/DIV., 1 ms./DIV.
      Condition Engine switch on (IG), main switch assembly (clearance sonar main switch) on