THEFT DETERRENT SYSTEM TERMINALS OF ECU


  1. CHECK MAIN BODY ECU, INSTRUMENT PANEL JUNCTION BLOCK


    1. Remove the main body ECU.

      A01179UE01
      Text in Illustration
      *1 Instrument Panel Junction Block
      A011B53E01
      Text in Illustration
      *1 Main Body ECU

    2. Disconnect the D42 main body ECU connector.

    3. Measure the resistance and voltage between each terminal of the wire harness side connectors and body ground.

      Terminal No. (Symbol). Wiring Color Terminal Description Condition Specified Condition
      3F-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
      3F-4 (FRCY) - Body ground - Front door courtesy light switch RH input Front door RH CLOSED (off) → OPEN (on) 10 kΩ or higher → Below 1 Ω
      3F-11 (GND1) - Body ground - Ground Always Below 1 Ω
      3F-20 (HCTY) - Body ground - Engine hood courtesy switch input Engine hood CLOSED (off) → OPEN (on) 10 kΩ or higher → Below 1 Ω
      3F-29 (ACC) - Body ground - Ignition power supply (ACC signal) Ignition switch ACC → off 11 to 14 V → Below 1 V
      3F-30 (BECU) - Body ground - +B (power system signal system) power supply Always 11 to 14 V
      3F-31 (ALTB) - Body ground - +B (power system alternator system) power supply Always 11 to 14 V
      3F-32 (IG) - Body ground - Ignition power supply (IG signal) Ignition switch ON → off 11 to 14 V → Below 1 V
      D42-17 (KSW) - Body ground*1 LG - Body ground Unlock warning switch input NO key in ignition key cylinder (off) → Key inserted (on) 10 kΩ or higher → Below 1 Ω
      D42-19 (BCTY) - Body ground V - Body ground Back door courtesy light switch input Back door CLOSED (off) → OPEN (on) 10 kΩ or higher → Below 1 Ω

      • *1: w/o Entry and Start System

      Tech Tips

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

    4. Reinstall the main body ECU.

    5. Reconnect the main body ECU connector.

    6. Measure the voltage between each terminal of the wire harness side connectors and body ground.

      Terminal No. (Symbol). Wiring Color Terminal Description Condition Specified Condition
      D42-3 (HAZ) - Body ground R - Body ground Turn signal flasher relay signal System is in alarm sounding state Below 1 V
      3B-22 (HORN) - Body ground G-B - Body ground Vehicle horn drive

      Vehicle horn is sounding

      (Theft deterrent system is in alarm sounding state)

      Pulse generation

      (Below 1 V ← → 12 V)
      3B-40 (SH) - Body ground GR - Body ground Security horn drive

      Vehicle horn is sounding

      (Theft deterrent system is in alarm sounding state)

      Pulse generation

      (Below 1 V ← → 12 V)

      If the result is not as specified, the main body ECU may have a malfunction.