TOYOTA PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU


  1. CHECK CLEARANCE WARNING ECU

    A01BEUJE02
    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    H54-1 (IG) - H54-22 (E) B - W Clearance sonar on/off switch signal Ignition switch ON, clearance sonar main switch on 11 to 14 V
    Ignition switch ON, clearance sonar main switch off Below 1 V
    H54-5 (SPD) - H54-22 (E) P - W Vehicle speed signal Ignition switch ON, back sonar or clearance sonar switch on, vehicle speed signal input

    11 to 14 V

    (Frequency changes according to vehicle speed)
    H54-7 (PL) - H54-22 (E)* R - W Parking signal Ignition switch ON, shift lever in P 7 V or higher
    Ignition switch ON, shift lever not in P Below 1 V
    H54-9 (L4) - H54-22 (E) Y - W Front corner sensor RH indicator signal Clearance warning indicator LED for front corner sensor RH illuminates Below 3 V
    H54-12 (E6) - H54-22 (E) W - W Front corner sensor LH ground Ignition switch ON, clearance sonar main switch on Below 1 Ω
    H54-13 (S6) - H54-12 (E6) B - W Front corner sensor LH sensor signal

    • All conditions met:


      • Ignition switch ON, back sonar or clearance sonar switch on

      • Shift lever not in P (for Automatic Transmission) or R

      • Vehicle speed less than 10 km/h (6 mph) with shift lever not in P (for Automatic Transmission) or R

    Pulse generation

    (See waveform 2)
    H54-15 (E4) - H54-22 (E) Y -W Rear center sensor LH ground Always Below 1 Ω
    H54-16 (S4) - H54-15 (E4) L - Y Rear corner sensor RH sensor signal

    • All conditions met:


      • Ignition switch ON, back sonar or clearance sonar switch on

      • Shift lever not in P or R

    Pulse generation

    (See waveform 2)
    H54-17 (E1) - H54-22 (E) Y - W Rear corner sensor RH ground Always Below 1 Ω
    H54-18 (S1) - H54-17 (E1) B - Y Rear corner sensor RH sensor signal

    • All conditions met:


      • Ignition switch ON, back sonar or clearance sonar switch on

      • Shift lever in R

    Pulse generation

    (See waveform 2)
    H54-20 (EF) - H54-22 (E) BR - W Clearance warning buzzer signal When sonar detects obstacle (buzzer sounds)

    Pulse generation

    (See waveform 1)
    Buzzer not sounding 11 to 14 V
    H54-22 (E) - Body ground W - Body ground ECU ground Always Below 1 Ω
    H54-23 (RL) - H54-22 (E) L - W Reverse signal Ignition switch ON, shift lever in R 7 V or higher
    Ignition switch ON, shift lever not in R Below 1 V
    H54-24 (TL) - H54-22 (E) G - W Illumination signal Ignition switch ON, light control switch on 11 to 14 V
    Ignition switch ON, light control switch off Below 1 V
    H54-26 (L5) - H54-22 (E) GR - W Front corner sensor LH indicator signal Clearance warning indicator LED for front corner sensor LH illuminates Below 3 V
    H54-28 (L1) - H54-22 (E) LG - W Rear corner sensor RH indicator signal Clearance warning indicator LED for rear corner sensor RH illuminates Below 3 V
    H54-29 (L2) - H54-22 (E) BE - W Rear corner sensor LH indicator signal Clearance warning indicator LED for rear corner sensor LH illuminates Below 3 V
    H54-30 (L3) - H54-22 (E) V - W Rear center sensor indicator signal Clearance warning indicator LED for rear center sensor illuminates Below 3 V
    H54-31 (L10) - H54-22 (E) SB - W Vehicle LED indicator signal Clearance warning indicator LED for vehicle LED illuminates Below 3 V
    H54-33 (E5) - H54-22 (E) G - W Front corner sensor RH ground Always Below 1 Ω
    H54-34 (S5) - H54-33 (E5) R - G Front corner sensor RH sensor signal

    • All conditions met:


      • Ignition switch ON, back sonar or clearance sonar switch on

      • Shift lever not in P (for Automatic Transmission) or R

      • Vehicle speed less than 10 km/h (6 mph) with shift lever not in P (for Automatic Transmission) or R

    Pulse generation

    (See waveform 2)
    H54-37 (E2) - H54-22 (E) R - W Rear corner sensor LH ground Always Below 1 Ω
    H54-38 (S2) - H54-37 (E2) W - R Rear corner sensor LH sensor signal

    • All conditions met:


      • Ignition switch ON, back sonar or clearance sonar switch on

      • Shift lever in R

    Pulse generation

    (See waveform 2)
    H54-39 (E3) - H54-22 (E) V - W Rear center sensor RH ground Always Below 1 Ω
    H54-40 (S3) - H54-39 (E3) P - V Rear center sensor RH power source

    • All conditions met:


      • Ignition switch ON, back sonar or clearance sonar switch on

      • Shift lever in R

    Pulse generation

    (See waveform 2)

    • *: for Automatic Transmission


    1. A01BHXSE01

      Using an oscilloscope, check waveform 1.

      Measurement Condition
      Item Content
      Terminal No. (Symbol) H54-20 (EF) - H54-22 (E)
      Tool Setting 2 V/DIV., 0.2 msec./DIV.
      Condition When sonar detects obstacle (buzzer sounds)

      Tech Tips

      The amplitude of the waveform changes depending on the volume setting.

    2. A01BHVOE02

      Using an oscilloscope, check waveform 2.

      Measurement Condition
      Item Content
      Terminal No. (Symbol)

      • H54-13 (S6) - H54-12 (E6)

      • H54-16 (S4) - H54-15 (E4)

      • H54-18 (S1) - H54-17 (E1)

      • H54-34 (S5) - H54-33 (E5)

      • H54-38 (S2) - H54-37 (E2)

      • H54-40 (S3) - H54-39 (E3)
      Tool Setting 2 V/DIV., 0.05 msec./DIV.
      Condition Ignition switch ON, clearance sonar main switch on