THEFT DETERRENT SYSTEM TERMINALS OF ECU


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


    1. Disconnect the main body ECU (multiplex network body ECU) connectors.

      A00Y6QDC01
      *A Main body ECU (multiplex network body ECU) with 1 connector - -
      *1 Main body ECU (multiplex network body ECU) - -
      *a 1 connector - -
      A00Y8J8C01
      *A Main body ECU (multiplex network body ECU) with 2 connectors - -
      *1 Main body ECU (multiplex network body ECU) - -
      *a 2 connectors - -

    2. 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.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      MB-30 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      MB-32 (IG) - Body ground - Ignition power supply (IG signal) Ignition switch ON → OFF 11 to 14 V → Below 1 V
      MB-29 (ACC) - Body ground - Ignition power supply (ACC signal) Ignition switch ACC → OFF 11 to 14 V → Below 1 V
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      MB-2 (FLCY) - Body ground - Front door courtesy light switch LH input Front door LH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      E22-19 (FRCY) - Body ground V - Body ground Front door courtesy light switch RH input Front door RH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      E22-24 (LCTY) - Body ground SB - Body ground Rear door courtesy light switch LH input Rear door LH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      E22-6 (RCTY) - Body ground LG - Body ground Rear door courtesy light switch RH input Rear door RH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      MB-20 (BCTY) - Body ground - Back door courtesy light switch input Back door closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      E108-5 (HCTY) - Body ground SB - Body ground Engine hood courtesy switch input Engine hood open (OFF) → closed (ON) 10 kΩ or higher → Below 1 Ω
      E22-17 (KSW) - Body ground* V - Body ground Unlock warning switch input Key not in key cylinder (OFF) → Key in key cylinder (ON) 10 kΩ or higher → Below 1 Ω

      • *: w/o Entry and Start System

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Reconnect the main body ECU (multiplex network body ECU) connectors.

    4. 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
      E22-7 (LSFL) - Body ground Y - Body ground Front door LH unlock detection switch input Front door LH unlocked Below 1 V
      E22-7 (LSFL) - Body ground Y - Body ground Front door LH unlock detection switch input Front door LH locked Pulse generation
      E22-18 (LSFR) - Body ground LG - Body ground Front door RH unlock detection switch input Front door RH unlocked Below 1 V
      E22-18 (LSFR) - Body ground LG - Body ground Front door RH unlock detection switch input Front door RH locked Pulse generation
      3E-37 (LSR) - Body ground Y- Body ground Rear door LH unlock detection switch input Rear door LH or RH unlocked Below 1 V
      3E-37 (LSR) - Body ground Y - Body ground Rear door LH unlock detection switch input Rear door LH and RH locked Pulse generation
      3E-22 (LSR) - Body ground Y - Body ground Rear door RH unlock detection switch input Rear door RH or LH unlocked Below 1 V
      3E-22 (LSR) - Body ground Y - Body ground Rear door RH unlock detection switch input Rear door RH and LH locked Pulse generation
      E108-22 (IND) - Body ground* Y - Body ground Security indicator illumination

      Security indicator light illuminates

      (It illuminates only for 27.5 second in alarm sounding state.)

      		 3 to 10 V
      3C-40 (SH) - Body ground R - Body ground Security horn drive

      Security horn sounding

      (Theft deterrent system in alarm sounding state)

      Pulse generation

      (Below 1 V ← → 11 to 14 V)
      3A-24 (HORN) - Body ground LG - Body ground Vehicle horn drive

      Vehicle horns sounding

      (Theft deterrent system in alarm sounding state)

      Pulse generation

      (Below 1 V ← → 11 to 14 V)

      • *: w/o Entry and Start System

      If the result is not as specified, the main body ECU (multiplex network body ECU) may be malfunctioning.