TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU


  1. CHECK TIRE PRESSURE WARNING ECU AND RECEIVER


    1. A01G3VQC31
      *A for Hatchback
      *B for Wagon
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)

      Disconnect the L65 or Q15 tire pressure warning ECU and receiver connector and measure the voltage and resistance on the wire harness side.

      for Hatchback:
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      L65-1 (IG) - L65-12 (GND) L - W-B IG power source Power switch on (IG) 10 to 16 V
      L65-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      for Wagon:
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      Q15-1 (IG) - Q15-12 (GND) L - W-B IG power source Power switch on (IG) 10 to 16 V
      Q15-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    2. Connect the L65 or Q15 tire pressure warning ECU and receiver connector.

    3. Measure the voltage and resistance according to the value(s) in the table below. If the result is not as specified, the ECU may be malfunctioning.

      Tech Tips

      Measure the values on the wire harness side while the connector is connected.

      A01G3VSC14
      *A for Hatchback *B for Wagon
      *a

      Component with harness connected

      (Tire Pressure Warning ECU and Receiver)

      		 - -
      for Hatchback:
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      L65-3 (CLSW) - L65-12 (GND) R - W-B Tire pressure warning reset switch

      • Power switch on (IG)

      • Tire pressure warning reset switch on

      		 Below 1.5 V

      • Power switch on (IG)

      • Tire pressure warning reset switch off

      		 8 to 15 V
      L65-4 (RDA2) - L65-12 (GND) G - W-B Output signals Power switch on (IG) Pulse generation (see waveform 1)
      L65-5 (PRG2) - L65-12 (GND) Y - W-B Input signals Power switch on (IG) Pulse generation (see waveform 1)
      for Wagon:
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      Q15-3 (CLSW) - Q15-12 (GND) R - W-B Tire pressure warning reset switch

      • Power switch on (IG)

      • Tire pressure warning reset switch on

      		 Below 1.5 V

      • Power switch on (IG)

      • Tire pressure warning reset switch off

      		 8 to 15 V
      Q15-4 (RDA2) - Q15-12 (GND) G - W-B Output signals Power switch on (IG) Pulse generation (see waveform 1)
      Q15-5 (PRG2) - Q15-12 (GND) Y - W-B Input signals Power switch on (IG) Pulse generation (see waveform 1)
    4. A01G2RMC03
      *a Example
      *b GND

      Using an oscilloscope, check waveform 1.

      Waveform 1:
      Item Contents
      Terminal

      L65-4 (RDA2) - L65-12 (GND)*1

      L65-5 (PRG2) - L65-12 (GND)*1

      Q15-4 (RDA2) - Q15-12 (GND)*2

      Q15-5 (PRG2) - Q15-12 (GND)*2
      Tool setting 5 V/DIV, 5 ms./DIV.
      Vehicle condition Power switch on (IG)

      *1: for Hatchback

      *2: for Wagon

      Tech Tips

      The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal.