THEFT DETERRENT SYSTEM TERMINALS OF ECU


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

    B0077UOE04

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

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    2. Reconnect the instrument panel junction block assembly connectors.

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

      Tech Tips

      Measure the values on the wire harness side with the connector disconnected.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      MB-31 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      MB-32 (IG) - Body ground - Ignition power supply (IG signal) Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      MB-30 (ACC) - Body ground - Ignition power supply (ACC signal) Engine switch off Below 1 V
      Engine switch on (ACC) 11 to 14 V
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      O2-6 (FLCY) - Body ground V - Body ground Front door courtesy light switch assembly (for LH) input Front door LH closed (OFF) 10 kΩ or higher
      Front door LH open (ON) Below 1 Ω
      O2-27 (FRCY) - Body ground V - Body ground Front door courtesy light switch assembly (for RH) input Front door RH closed (OFF) 10 kΩ or higher
      Front door RH open (ON) Below 1 Ω
      MB-4 (LGCY) - Body ground - Luggage compartment door courtesy light switch input Luggage compartment door closed (OFF) 10 kΩ or higher
      Luggage compartment door open (ON) Below 1 Ω
      O2-11 (HCTY) - Body ground B - Body ground Engine hood courtesy switch input Engine hood open (OFF) 10 kΩ or higher
      Engine hood closed (ON) Below 1 Ω
      O2-18 (TKUL) - Body ground R - Body ground Luggage compartment door unlock switch input Luggage compartment door lock key cylinder in neutral position 10 kΩ or higher
      Luggage compartment door lock key cylinder in unlock position Below 1 Ω

    4. Install the main body ECU (multiplex network body ECU) to 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.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      4B-26 (LSFL) - Body ground G - Body ground Front door LH unlock detection switch input Front door LH unlocked Below 1 V
      Front door LH locked Pulse generation
      4B-27 (LSFR) - Body ground B - Body ground Front door RH unlock detection switch input Front door RH unlocked Below 1 V
      Front door RH locked Pulse generation
      O2-29 (L2) - Body ground

      L - Body ground*5

      G - Body ground*6

      		 Driver door key-linked lock input Driver door key cylinder turned to lock position Below 1 V
      Driver door key cylinder off Pulse generation
      O2-2 (UL3) - Body ground

      LG - Body ground*5

      Y - Body ground*6

      		 Driver door key-linked unlock input Driver door key cylinder turned to unlock position Below 1 V
      Driver door key cylinder off Pulse generation
      O1-6 (GCS) - Body ground*2 B - Body ground Communication line between main body ECU (multiplex network body ECU) and tilt sensor (yaw rate and acceleration sensor) Theft deterrent system changes from disarmed state to armed preparation state.

      Pulse generation

      (See waveform 1)
      O1-12 (ISIF) - Body ground*1 G - Body ground Intrusion sensor (theft warning ultrasonic sensor) signal input 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 2)
      O2-7 (GPBS) - Body ground*1 L - Body ground Glass breakage sensor signal input Glass breakage sensor circuit not open Below 1 V
      O1-13 (SSW1) - Body ground*1 L - Body ground Intrusion sensor cancel switch signal Intrusion sensor cancel switch not pushed Pulse generation
      Intrusion sensor cancel switch pushed Below 1 V
      O1-18 (SSCL) - Body ground*4 R - Body ground Theft warning siren assembly drive

      Theft warning siren assembly sounding

      (Theft deterrent system in alarm sounding state)

      Pulse generation

      (Below 1 V ← → 11 to 14 V)
      4C-26 (SH) - Body ground*3 L - Body ground Security horn assembly drive

      Security horn assembly sounding

      (Theft deterrent system is in alarm sounding state)

      Pulse generation

      (Below 1 V ← → 11 to 14 V)
      4C-24 (HORN) - Body ground L - Body ground Vehicle horns drive

      Vehicle horns sounding

      (Theft deterrent system is in alarm sounding state)

      Pulse generation

      (Below 1 V ← → 11 to 14 V)

      • *1: w/ Intrusion Sensor Cancel Switch

      • *2: w/ Tilt Sensor

      • *3: w/ Security Horn Assembly

      • *4: w/o Security Horn Assembly

      • *5: for LHD

      • *6: for RHD

    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)

        B0075P1C03
        *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 - -

      2. Waveform 2 (Reference)

        B0075P1C03
        3. *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 - -