TOYOTA PARKING ASSIST-SENSOR SYSTEM(w/o Multi-display) TERMINALS OF ECU


  1. CHECK CLEARANCE WARNING ECU

    B001EGGE02

    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
      I1-3 (SPD) - I1-21 (E) R - W-B Vehicle speed signal Ignition switch ON, back sonar or clearance sonar switch on Alternating between 1.5 to 4.5 V
      I1-6 (SOR) - I1-22 (E2) W - R Rear ultrasonic sensor communication signal (Rear clearance sonar sensor) Ignition switch ON, back sonar or clearance sonar switch on, shift lever in R

      Pulse generation

      (See waveform 2)
      I1-8 (CSSW) - I1-21 (E) V - W-B Clearance sonar on/off switch signal Back sonar or clearance sonar switch on 11 to 14 V
      I1-10 (IG) - I1-21 (E) L - W-B IG signal/IG power source signal Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      I1-13 (RL) - I1-21 (E) R - W-B Reverse signal Ignition switch ON, shift lever in R 11 to 14 V
      Ignition switch ON, shift lever not in R Below 1 V
      I1-14 (BBZ) - I1-12 (EF) GR - LG No. 1 clearance warning buzzer signal Buzzer not sounding Below 1 V
      When sonar detects obstacle (buzzer sounds)

      Pulse generation

      (See waveform 1)
      I1-15 (L1) - I1-21 (E) LG - W-B Clearance warning ECU signal Clearance warning indicator LED for rear right sensor illuminates Below 3 V
      I1-17 (L3) - I1-21 (E) L - W-B Ultrasonic sensor (rear center right and left sensor) Clearance warning indicator LED for rear left sensor illuminates Below 3 V
      I1-19 (L5) - I1-21 (E) P - W-B Ultrasonic sensor (rear left sensor) Clearance warning indicator LED for back sensor illuminates Below 3 V
      I1-20 (L6) - I1-21 (E) R - W-B Ultrasonic sensor (rear right sensor) Clearance warning indicator's operation indicator illuminates Below 3 V
      I1-21 (E) - Body ground W-B - Body ground ECU ground Always Below 1 Ω
      I1-22 (E2) - I1-21 (E) R - W-B ECU ground Always Below 1 Ω
      I1-24 (BOR) - I1-22 (E2) P - R Rear ultrasonic sensor circuit power source Ignition switch off Below 1.5 V
      Ignition switch ON, back sonar or clearance sonar switch on 7.2 to 8.8 V
    2. B001GGAE01

      Using an oscilloscope, check waveform 1.

      Measurement Condition
      Item Content
      Terminal No. (Symbol) I1-14 (BBZ) - I1-12 (EF)
      Tool Setting 2 V/DIV., 500 μsec./DIV.
      Condition When sonar detects obstacle (buzzer sounds)
    3. B001IAME01

      Using an oscilloscope, check waveform 2.

      Measurement Condition
      Item Content
      Terminal No. (Symbol) I1-6 (SOR) - I1-22 (E2)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Ignition switch ON, back sonar or clearance sonar switch on, shift lever in R