THEFT DETERRENT SYSTEM TERMINALS OF ECU


  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    B004TKOC25
    *1 Main body ECU (multiplex network body ECU) - -

    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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    2. Connect the instrument panel junction block assembly connectors.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      A-11 (GND1) - Body ground None - Body ground Ground Always Below 1 Ω
      A-30 (ACC) - Body ground None - Body ground ACC power supply Power switch on (ACC) 11 to 14 V
      Power switch off Below 1 V
      A-31 (BECU) - Body ground None - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      A-32 (IG) - Body ground None - Body ground IG power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      G12-1 (FLCY) - Body ground R - Body ground Front door courtesy light switch assembly LH input signal Front door LH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      G12-6 (FRCY) - Body ground

      SB - Body ground*1

      R - Body ground*2

      		 Front door courtesy light switch assembly RH input signal Front door RH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      A-13 (LCTY) - Body ground None - Body ground Rear door courtesy light switch assembly LH input signal Rear door LH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      A-2 (RCTY) - Body ground None - Body ground Rear door courtesy light switch assembly RH input signal Rear door RH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      G12-30 (HCTY) - Body ground P - Body ground Engine hood courtesy switch input signal Engine hood open (OFF) → closed (ON) 10 kΩ or higher → Below 1 Ω

    4. Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.

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    5. Measure the voltage and check for pulses according to the value(s) in the table below.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition

      5H-31 (LSFL) - Body ground*1

      5A-15 (LSFL) - Body ground*2

      P - Body ground*1

      B - Body ground*2

      		 Front door LH unlock detection switch input signal Front door LH unlocked Below 1 V
      Power switch off, all doors closed and front door LH locked Pulse generation

      5D-14 (LSFR) - Body ground*1

      5H-31 (LSFR) - Body ground*2

      		 GR - Body ground Front door RH unlock detection switch input signal Front door RH unlocked Below 1 V
      Power switch off, all doors closed and front door RH locked Pulse generation

      5H-21 (LSWL) - Body ground*1

      5D-12 (LSWL) - Body ground*2

      B - Body ground*1

      SB - Body ground*2

      		 Rear door LH unlock detection switch input signal Rear door LH unlocked Below 1 V
      Power switch off, all doors closed and rear door LH locked Pulse generation
      G13-20 (LSWR) - Body ground B - Body ground Rear door RH unlock detection switch input signal Rear door RH unlocked Below 1 V
      Power switch off, all doors closed and rear door RH locked Pulse generation
      G17-12 (SSCL) - Body ground*3 L - Body ground Theft warning siren assembly drive Theft warning siren assembly sounding (Theft deterrent system is in alarm sounding state) Pulse generation (Below 1 V ←→ 11 to 14 V)
      G17-3 (SSW1) - Body ground*4 P - Body ground Intrusion sensor cancel switch signal Intrusion sensor cancel switch on Below 1 V
      Intrusion sensor cancel switch off Pulse generation
      G17-14 (ISIF) - Body ground*4 B - Body ground Intrusion sensor (theft warning ultrasonic sensor) signal No moving object detected by sensor 11 to 14 V
      Theft deterrent system changes from disarmed state to armed preparation state

      Pulse generation

      (See Waveform 1)
      G17-15 (GCS) - Body ground*5 BE - Body ground Yawrate sensor (theft warning tilt sensor) signal Theft deterrent system changes from armed preparation state to armed state

      Pulse generation

      (See Waveform 2)
      5F-30 (SH) - Bodyground*6 R - Body ground Security horn drive Security horn sounding (Theft deterrent system is in alarm sounding state) Pulse generation (Below 1 V ←→ 11 to 14 V)

      5F-16 (HORN) - Body ground*1

      5F-28 (HORN) - Body ground*2

      		 P - Body ground Vehicle horn drive Vehicle horns sounding (Theft deterrent system is in alarm sounding state) Pulse generation (Below 1 V ←→ 11 to 14 V)

      • *1: for LHD

      • *2: for RHD

      • *3: w/o Security Horn Assembly

      • *4: w/ Intrusion Sensor Cancel Switch

      • *5: w/ Tilt Sensor

      • *6: w/ Security Horn Assembly

    6. Using an oscilloscope, check the waveform.

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.


      1. Waveform 1 (Reference)

        B004YQFC03
        *a IOUT Initial Signal *b IOUT Initial Response
        *c Approximately 1.0 Second *d Initial Diagnosis
        *e Approximately 1.0 to 1.6 Seconds *f Approximately 0.05 Seconds
        *g Approximately 5.5 Seconds *h Disarmed State
        *i Arming Preparation State - -

      2. Waveform 2 (Reference)

        B004YQFC03
        3. *a CSIF Initial Signal *b CSIF Initial Response
        *c Approximately 1.0 Second *d Initial Diagnosis
        *e Approximately 1.0 to 1.6 Seconds *f Approximately 0.05 Seconds
        *g Approximately 5.5 Seconds *h Disarmed State
        *i Arming Preparation State - -