KEY REMINDER WARNING SYSTEM TERMINALS OF ECU


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

    B00403HC05
    *A Main Body ECU (Multiplex Network Body ECU) with 2 Connectors - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    *a 2 connectors - -
    A0028JSC05
    *A Main Body ECU (Multiplex Network Body ECU) with 3 Connectors - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    *a 3 connectors - -

    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 Terminal Description Condition Specified Condition
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      MB-31 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      MB-30 (ACC) - Body ground - ACC power supply Ignition switch ACC 11 to 14 V
      MB-30 (ACC) - Body ground - ACC power supply Ignition switch off Below 1 V
      MB-32 (IG) - Body ground - IG power supply Ignition switch ON 11 to 14 V
      MB-32 (IG) - Body ground - IG power supply Ignition switch off Below 1 V

    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 Terminal Description Condition Specified Condition
      F19-27 (FRCY) - Body ground*1 L - Body ground Front door courtesy light switch assembly (for RH) input Front door RH open Below 1 V
      F19-27 (FRCY) - Body ground*1 L - Body ground Front door courtesy light switch assembly (for RH) input Front door RH closed 11 to 14 V or Pulse generation
      F19-6 (FLCY) - Body ground*2 GR - Body ground Front door courtesy light switch assembly (for LH) input Front door LH open Below 1 V
      F19-6 (FLCY) - Body ground*2 GR - Body ground Front door courtesy light switch assembly (for LH) input Front door LH closed 11 to 14 V or Pulse generation
      4D-28 (KSW) - Body ground GR - Body ground Key unlock warning switch input No key in ignition key cylinder 11 to 14 V or Pulse generation
      4D-28 (KSW) - Body ground GR - Body ground Key unlock warning switch input Key in ignition key cylinder Below 1 V

      • *1: for RHD

      • *2: for LHD