KEY REMINDER WARNING SYSTEM (w/o Entry and Start System) TERMINALS OF ECU


  1. CHECK MAIN BODY ECU, INSTRUMENT PANEL JUNCTION BLOCK


    1. Remove the main body ECU.

      A01179UE01
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      *1 Instrument Panel Junction Block
      A011B53E01
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      *1 Main Body ECU (w/ Theft Deterrent System)
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      *1 Main Body ECU (w/o Theft Deterrent System)

    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-29 (ACC) - Body ground - Ignition power supply (ACC signal) Ignition switch ON (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 (IG) → off 11 to 14 V → Below 1 V
      D42-17 (KSW) - Body ground LG - Body ground Unlock warning switch input NO key in ignition key cylinder (off) → Key inserted (on) 10 kΩ or higher → Below 1 Ω

      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
      D42-17 (KSW) - Body ground LG - Body ground Unlock warning switch input NO key in ignition key cylinder (off) → Key inserted (on) 11 to 14 V → Below 1 V
      3E-24 (FLCY) - Body ground G - Body ground Front door courtesy light switch LH input Front door LH CLOSED (off) → OPEN (on) Pulse generation → Below 1 V
      3E-35 (FRCY) - Body ground B - Body ground Front door courtesy light switch RH input Front door RH CLOSED (off) → OPEN (on) Pulse generation → Below 1 V

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