LIGHTING SYSTEM TERMINALS OF ECU


  1. CHECK MAIN BODY ECU AND INSTRUMENT PANEL JUNCTION BLOCK

    A01179UE01
    Text in Illustration
    *1 Instrument Panel Junction Block
    A011B53E01
    Text in Illustration
    *1 Main body ECU (w/ Theft Deterrent System)
    A0119MJE02
    Text in Illustration
    *1 Main body ECU (w/o Theft Deterrent System)

    1. Remove the 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-11 (GND1) - Body ground - Ground Always Below 1 Ω
      3F-29 (ACC)*1 - 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-32 (IG)*1 - Body ground - Ignition power supply (IG signal) Ignition switch ON → off 11 to 14 V → Below 1 V
      D42-19 (BCTY) - Body ground V - Body ground Back door courtesy switch input Back door CLOSED → OPEN 10 kΩ or higher → Below 1 Ω

      • *1: w/o Entry and Start System

      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
      3C-12 (ILE) - Body ground B - Body ground Illumination signal (to map light assembly) Map light switch in DOOR position and map light assembly comes on 11 to 14 V
      Map light switch in OFF position and map light assembly comes off Below 1 V

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