ACTIVE REAR WING SYSTEM TERMINALS OF ECU


  1. SPOILER CONTROL ECU ASSEMBLY

    B000P5KE01

    1. Disconnect the X79 spoiler control ECU assembly.

    2. Measure the voltage and resistance, and check the pulses according to the value(s) in the table below.

      Tech Tips

      Measure the values on the wire harness side with the connectors disconnected.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      X79-18 (ECUB) - Body ground LA-GR - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      X79-19 (B) - Body ground LA-P - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      X79-16 (IG) - Body ground LA-B - Body ground Ignition switch power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      X79-1 (GND) - Body ground LA - Body ground Ground Always Below 1 Ω
      X79-14 (MSW) - Body ground B - Body ground No. 4 combination switch assembly (Spoiler control switch) signal No. 4 combination switch assembly (Spoiler control switch) not pressed 10 kΩ or higher
      No. 4 combination switch assembly (Spoiler control switch) pressed Below 1 Ω

    3. Reconnect the X79 spoiler control ECU assembly.

    4. Measure the voltage and check the pulses according to the value(s) in the table below.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      X79-6 (RSM+) - Body ground LA-B - Body ground Rear spoiler motor assembly operation signal Active rear wing rise operation being performed 11 to 14 V
      Active rear wing retract operation being performed Below 1 V
      X79-7 (RSM-) - Body ground LA-R - Body ground Rear spoiler motor assembly operation signal Active rear wing rise operation being performed Below 1 V
      Active rear wing retract operation being performed 11 to 14 V
      X79-4 (CSV) - Body ground BE - Body ground Hall IC power supply Power switch on (IG) 11 to 14 V
      X79-5 (CS1) - Body ground L - Body ground Hall IC1 signal Rear spoiler motor assembly operating

      Pulse generation

      (Waveform 1)

      (Below 1 V ←→ 9.5 to 13.33 V)
      X79-17 (CS2) - Body ground V - Body ground Hall IC2 signal Rear spoiler motor assembly operating

      Pulse generation

      (Waveform 1)

      (Below 1 V ←→ 9.5 to 13.33 V)
      X79-9 (CSG) - Body ground W - Body ground Hall IC ground Always Below 1 V
      X79-20 (IND) - Body ground P - Body ground Indicator light output

      Indicator light not illuminated

      (Active rear wing fully retracted)

      		 11 to 14 V

      Indicator light illuminated

      (Active rear wing raised)

      		 Below 1 V

    5. Using an oscilloscope, check the waveform.

      Note

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.


      1. B000OHQN03

        Waveform 1 (Reference)

        Item Content
        Tester Connection

        • X79-5 (CS1) - Body ground

        • X79-17 (CS2) - Body ground
        Tool Setting 5 V/DIV., 20 ms./DIV.
        Condition Rear spoiler motor assembly operating