LEXUS PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CHECK CLEARANCE WARNING ECU

    A01GNNKE08

    1. Disconnect the L169 ECU connector.

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

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L169-15 (IG) - L169-17 (E) V - W-B IG signal / IG power source signal Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      L169-17 (E) - Body ground W-B - Body ground ECU ground Always Below 1 Ω

    3. Reconnect the L169 ECU connector.

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

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L169-1 (CBZ) - L169-17 (E) W - W-B Front clearance warning buzzer signal Buzzer not sounding Below 1 V
      Buzzer sounding Waveform 2
      L169-2 (EE) - L169-17 (E) B - W-B Front clearance warning buzzer signal Buzzer not sounding Below 1 V
      Buzzer sounding Waveform 2
      L169-7 (BOR) - L169-18 (E2) B - R Rear sensor circuit power source Engine switch off Below 1 V
      Engine switch on (IG), clearance sonar main switch ON 7.2 to 8.8 V
      L169-9 (SOF) - L169-19 (E1) G - R Front sensor circuit power source Engine switch on (IG), clearance sonar main switch ON Waveform 1
      L169-10 (BBZ) - L169-17 (E) W - W-B Rear clearance warning buzzer signal Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      L169-11 (EF) - L169-17 (E) B - W-B Rear clearance warning buzzer signal Buzzer sounding Waveform 2
      L169-18 (E2) - L169-17 (E) R - W-B Rear sensor circuit ground Always Below 1 Ω
      L169-19 (E1) - L169-17 (E) R - W-B Front sensor circuit ground Always Below 1 Ω
      L169-21 (BOF) - L169-19 (E1) B - R Front sensor circuit power source Engine switch off Below 1 V
      Engine switch on (IG), clearance sonar main switch ON 7.2 to 8.8 V
      L169-24 (SOR) - L169-18 (E2) G - R Rear sensor circuit power source Engine switch on (IG), clearance sonar main switch ON Waveform 1
    5. A01GLDUE01

      Using an oscilloscope, check waveform 1.

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

      • CH: 1 L169-9 (SOF) - L169-19 (E1)

      • CH: 2 L169-24 (SOR) - L169-18 (E2)
      Tool Setting 2 V/DIV., 1 msec./DIV.
      Condition Engine switch on (IG), clearance sonar main switch ON.
    6. A01GK4S

      Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference)
      Item Content
      Terminal No. (Symbols)

      • L169-1 (CBZ) - L169-17 (E)

      • L169-2 (EE) - L169-17 (E)

      • L169-11 (EF) - L169-17 (E)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Engine switch on (IG), clearance sonar main switch ON, shift lever in R position and sensor is in detecting state

      Note


      • The waveforms of CBZ and EE are offset by a half cycle. EF is not synchronized with CBZ and EE.

      • The waveform's amplitude varies depending on the volume setting.