THEFT DETERRENT SYSTEM TERMINALS OF ECU


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

    B0070ETC09
    *A for LHD *B for RHD

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

      Click here

    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 Input/Output Terminal Description Condition Specified Condition Related Data List Item
      MB-31 (BECU) - Body ground - Input Battery power supply Always 11 to 14 V -
      MB-32 (IG) - Body ground - Input Ignition power supply (IG signal) Ignition switch off Below 1 V IG SW
      Ignition switch ON 11 to 14 V
      MB-30 (ACC) - Body ground - Input Ignition power supply (ACC signal) Ignition switch off Below 1 V ACC SW
      Ignition switch ACC 11 to 14 V
      MB-11 (GND1) - Body ground - - Ground Always Below 1 Ω -
      K52-1 (FLCY) - Body ground W - Body ground Input Front door courtesy light switch assembly (for LH) input Front door LH closed 10 kΩ or higher FL Door Courtesy SW
      Front door LH open Below 1 Ω
      K52-6 (FRCY) - Body ground BE - Body ground Input Front door courtesy light switch assembly (for RH) input Front door RH closed 10 kΩ or higher FR Door Courtesy SW
      Front door RH open Below 1 Ω
      MB-13 (LCTY) - Body ground - Input Rear door courtesy light switch assembly (for LH) input Rear door LH closed 10 kΩ or higher RL Door Courtesy SW
      Rear door LH open Below 1 Ω
      MB-2 (RCTY) - Body ground - Input Rear door courtesy light switch assembly (for RH) input Rear door RH closed 10 kΩ or higher RR Door Courtesy SW
      Rear door RH open Below 1 Ω
      K52-30 (HCTY) - Body ground GR - Body ground Input Engine hood courtesy switch input Engine hood open 10 kΩ or higher Hood Courtesy SW
      Engine hood closed Below 1 Ω
      MB-4 (LGCY) - Body ground - Input Luggage compartment door courtesy light switch input Luggage compartment door closed 10 kΩ or higher Luggage Courtesy SW
      Luggage compartment door open Below 1 Ω
      MB-3 (KSW) - Body ground* - Input Unlock warning switch input Key not in ignition key cylinder 10 kΩ or higher Key Unlock Warning SW
      Key in ignition key cylinder Below 1 Ω

      • *: w/o Smart Entry and Start System

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

      Click here

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

      Terminal No. (Symbol) Wiring Color Input/Output Terminal Description Condition Specified Condition Related Data List Item
      3B-13 (LSFL) - Body ground W - Body ground Input Front door LH unlock detection switch input Front door LH unlocked Below 1 V FL Door Lock Pos SW
      Front door LH locked 11 to 14 V
      3B-12 (LSFR) - Body ground GR - Body ground Input Front door RH unlock detection switch input Front door RH unlocked Below 1 V FR Door Lock Pos SW
      Front door RH locked 11 to 14 V
      K53-18 (L2) - Body ground LG - Body ground Input Driver door key-linked lock input Driver door key cylinder turned to lock position Below 1 V Door Key SW-Lock
      Driver door key cylinder off 11 to 14 V
      K53-17 (UL3) - Body ground BE - Body ground Input Driver door key-linked unlock input Driver door key cylinder turned to unlock position Below 1 V D Door Key SW-UL
      Driver door key cylinder off 11 to 14 V
      3B-14 (LSWL) - Body ground GR - Body ground Input Rear door LH unlock detection switch input Rear door LH unlocked Below 1 V RL-Door Lock Pos SW
      Rear door LH locked 11 to 14 V
      K51-20 (LSWR) - Body ground L - Body ground Input Rear door RH unlock detection switch input Rear door RH unlocked Below 1 V RR-Door Lock Pos SW
      Rear door RH locked 11 to 14 V
      3A-20 (SH) - Body ground L - Body ground Output Security horn assembly drive

      Security horn assembly sounding

      (Theft deterrent system in alarm sounding state)

      Pulse generation

      (Below 1 V ← → 11 to 14 V)

      		 -
      3C-27 (HORN) - Body ground W - Body ground Output Vehicle horns drive

      Vehicle horns sounding

      (Theft deterrent system in alarm sounding state)

      Pulse generation

      (Below 1 V ← → 11 to 14 V)

      		 -
      K52-7 (IND) - Body ground* B - Body ground Output Security indicator illumination

      Security indicator light illuminated

      (Theft deterrent system in alarm sounding state)

      		 Pulse generation → Below 2 V -

      • *: w/o Smart Entry and Start System