TOYOTA PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU

  1. CHECK CLEARANCE WARNING ECU

    U123968E02

    Terminal No. (Symbol)

    Wiring Color

    Terminal Description

    Condition

    Specified Condition

    H95-1 (IG) - H95-22 (E)

    P - W-B

    Clearance sonar on/off switch signal

    Ignition switch ON, back sonar or clearance sonar switch on

    11 to 14 V

    Ignition switch ON, back sonar or clearance sonar switch off

    Below 1 V

    H95-5 (SPD) - H95-22 (E)

    Y - W-B

    Vehicle speed signal

    Ignition switch ON, back sonar or clearance sonar switch on, vehicle speed signal input

    Pulse generation

    (Frequency changes according to vehicle speed)

    H95-6 (PKB) - H95-22 (E)

    P - W-B

    Parking brake switch signal

    Parking brake switch on

    Below 1 V

    Parking brake switch off

    11 to 14 V

    H95-7 (PL) - H95-22 (E)*

    V - W-B

    Parking signal

    Ignition switch ON, shift lever in P

    7 V or higher

    Ignition switch ON, shift lever not in P

    Below 1 V

    H95-9 (L4) - H95-22 (E)

    L - W-B

    Front corner sensor RH indicator signal

    Clearance warning indicator LED for front corner sensor RH illuminates

    Below 3 V

    H95-10 (E7) - H95-22 (E)

    W - W-B

    Front center sensor RH ground

    Always

    Below 1 Ω

    H95-11 (S7) - H95-10 (E7)

    R - W

    Front center sensor RH sensor signal

    • All conditions met:

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

      • Shift lever not in P (except Manual Transaxle) or R

      • Vehicle speed less than 10 km/h (6 mph)

    Pulse generation

    (See waveform 2)

    H95-12 (E6) - H95-22 (E)

    W - W-B

    Front corner sensor LH ground

    Always

    Below 1 Ω

    H95-13 (S6) - H95-12 (E6)

    L - 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 (except Manual Transaxle) or R

      • Vehicle speed less than 10 km/h (6 mph) with shift lever not in P (except Manual Transaxle) or R

    Pulse generation

    (See waveform 2)

    H95-15 (E4) - H95-22 (E)

    V -W-B

    Rear center sensor LH ground

    Always

    Below 1 Ω

    H95-16 (S4) - H95-15 (E4)

    P - V

    Rear center 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)

    H95-17 (E1) - H95-22 (E)

    W - W-B

    Rear corner sensor RH ground

    Always

    Below 1 Ω

    H95-18 (S1) - H95-17 (E1)

    P - W

    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)

    H95-19 (CBZ) - H95-20 (EF)

    SB - R

    Clearance warning buzzer signal

    When sonar detects obstacle (buzzer sounds)

    Pulse generation

    (See waveform 1)

    Buzzer not sounding

    11 to 14 V

    H95-20 (EF) - Body ground

    R - Body ground

    Positive (+) terminal of clearance warning buzzer

    Always

    11 to 14 V

    H95-22 (E) - Body ground

    W-B - Body ground

    ECU ground

    Always

    Below 1 Ω

    H95-23 (RL) - H95-22 (E)

    R - W-B

    Reverse signal

    Ignition switch ON, shift lever in R

    7 V or higher

    Ignition switch ON, shift lever not in R

    Below 1 V

    H95-24 (TL) - H95-22 (E)

    Y - W-B

    Illumination signal

    Ignition switch ON, light control switch on

    11 to 14 V

    Ignition switch ON, light control switch off

    Below 1 V

    H95-25 (MSDL) - H95-22 (E)

    R - W-B

    Clearance sonar switch illumination signal

    Ignition switch ON, back sonar or clearance sonar switch on

    Below 3 V

    H95-26 (L5) - H95-22 (E)

    Y - W-B

    Front corner sensor LH indicator signal

    Clearance warning indicator LED for front corner sensor LH illuminates

    Below 3 V

    H95-27 (L6) - H95-22 (E)

    B - W-B

    Front center sensor indicator signal

    Clearance warning indicator LED for front center sensor illuminates

    Below 3 V

    H95-28 (L1) - H95-22 (E)

    LG - W-B

    Rear corner sensor RH indicator signal

    Clearance warning indicator LED for rear corner sensor RH illuminates

    Below 3 V

    H95-29 (L2) - H95-22 (E)

    SB - W-B

    Rear corner sensor LH indicator signal

    Clearance warning indicator LED for rear corner sensor LH illuminates

    Below 3 V

    H95-30 (L3) - H95-22 (E)

    G - W-B

    Rear center sensor indicator signal

    Clearance warning indicator LED for rear center sensor illuminates

    Below 3 V

    H95-31 (L10) - H95-22 (E)

    R - W-B

    Vehicle LED indicator signal

    Clearance warning indicator LED for vehicle LED illuminates

    Below 3 V

    H95-33 (E5) - H95-22 (E)

    GR - W-B

    Front corner sensor RH ground

    Always

    Below 1 Ω

    H95-34 (S5) - H95-33 (E5)

    BR - GR

    Front corner sensor RH sensor signal

    • All conditions met:

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

      • Shift lever not in P (except Manual Transaxle) or R

      • Vehicle speed less than 10 km/h (6 mph) with shift lever not in P (except Manual Transaxle) or R

    Pulse generation

    (See waveform 2)

    H95-35 (E8) - H95-22 (E)

    W - W-B

    Front center sensor LH ground

    Always

    Below 1 Ω

    H95-36 (S8) - H95-35 (E8)

    P - W

    Front center sensor LH sensor signal

    • All conditions met:

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

      • Shift lever not in P (except Manual Transaxle) or R

      • Vehicle speed less than 10 km/h (6 mph)

    Pulse generation

    (See waveform 2)

    H95-37 (E2) - H95-22 (E)

    LG - W-B

    Rear corner sensor LH ground

    Always

    Below 1 Ω

    H95-38 (S2) - H95-37 (E2)

    L - LG

    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)

    H95-39 (E3) - H95-22 (E)

    BR - W-B

    Rear center sensor RH ground

    Always

    Below 1 Ω

    H95-40 (S3) - H95-39 (E3)

    GR - BR

    Rear center 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)

    • *: except Manual Transaxle

    1. E216530E01

      Using an oscilloscope, check waveform 1.

      Table 1. Measurement Condition

      Item

      Content

      Terminal No. (Symbol)

      H95-19 (CBZ) - H95-20 (EF)

      Tool Setting

      2 V/DIV., 0.2 msec./DIV.

      Condition

      When sonar detects obstacle (buzzer sounds)
      Tip:

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

    2. E216531E01

      Using an oscilloscope, check waveform 2.

      Table 2. Measurement Condition

      Item

      Content

      Terminal No. (Symbol)

      H95-11 (S7) - H95-10 (E7)

      H95-13 (S6) - H95-12 (E6)

      H95-16 (S4) - H95-15 (E4)

      H95-18 (S1) - H95-17 (E1)

      H95-34 (S5) - H95-33 (E5)

      H95-36 (S8) - H95-35 (E8)

      H95-38 (S2) - H95-37 (E2)

      H95-40 (S3) - H95-39 (E3)

      Tool Setting

      2 V/DIV., 0.05 msec./DIV.

      Condition

      Ignition switch ON, back sonar or clearance sonar switch on
      Table 3. Text in Illustration

      *a

      Ultrasonic sensor is normal

      *b

      Open circuit in ultrasonic sensor