THEFT DETERRENT SYSTEM TERMINALS OF ECU


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

    B002HZ8C01
    *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.


    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 Always 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
      I48-6 (FLCY) - Body ground G - 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
      I48-27 (FRCY) - Body ground W - Body ground 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
      A-4 (BCTY) - Body ground None - Body ground Back door courtesy light switch signal Back door closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      I48-11 (HCTY) - Body ground SB - 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.


    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
      4D-40 (LSFL) - Body ground B - Body ground 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
      4D-39 (LSFR) - Body ground P - 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
      4A-34 (LSWL) - Body ground Y - Body ground 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
      I47-2 (LSWR) - Body ground Y - 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
      4B-48 (SH) - Body ground*4 V - 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)
      I47-18 (SSCL) - Body ground*1 W - Body ground Theft warning siren drive Theft warning siren sounding (Theft deterrent system is in alarm sounding state) Pulse generation (Below 1 V ←→ 11 to 14 V)
      I47-13 (SSW1) - Body ground*2 Y - Body ground Intrusion sensor cancel switch signal Intrusion sensor cancel switch on Below 1 V
      Intrusion sensor cancel switch off Pulse generation
      I47-12 (ISIF) - Body ground*2 GR - Body ground Theft warning ultrasonic sensor signal input

      • No moving object detected by sensor

      • Vehicle tilt not detected*3

      		 11 to 14 V
      Theft deterrent system changes from disarmed state to armed preparation state

      Pulse generation

      (See Waveform 1)
      I48-7 (GPBS) - Body ground*5 BE - Body ground Glass breakage sensor signal Glass breakage sensor normal Below 2 V
      Glass breakage sensor malfunctioning 4.5 to 14 V
      4B-49 (HORN) - Body ground LG - 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: w/o Security Horn Assembly

      *2: w/ Intrusion Sensor Cancel Switch

      *3: w/ Tilt Sensor

      *4: w/ Security Horn Assembly

      *5: w/ Glass Breakage Sensor

    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)

        B002JATC03
        *a ISIF Initial Signal *b ISIF 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 - -