TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU


  1. CHECK TIRE PRESSURE WARNING ECU AND RECEIVER


    1. B006BTDC14
      *A except RHD and w/ Light Auto Turn-off System (w/ Delay Function)
      *B for RHD and w/ Light Auto Turn-off System (w/ Delay Function)
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)

      Disconnect the L48*1 or L110*2 tire pressure warning ECU and receiver connector and measure the voltage or resistance on the wire harness side.


      • *1: except RHD and w/ Light Auto Turn-off System (w/ Delay Function)

      • *2: for RHD and w/ Light Auto Turn-off System (w/ Delay Function)

      except RHD and w/ Light Auto Turn-off System (w/ Delay Function):
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      L48-1 (IG) - L48-12 (GND) R - W-B IG power source Engine switch on (IG) 10 to 16 V
      L48-7 (+B) - L48-12 (GND) LG - W-B Power supply (from battery) Always 10 to 16 V
      L48-9 (CANH) - L48-10 (CANL) Y - W CAN communication line Engine switch off 54 to 69 Ω
      L48-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      for RHD and w/ Light Auto Turn-off System (w/ Delay Function):
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      L110-1 (IG) - L110-12 (GND) R - W-B IG power source Engine switch on (IG) 10 to 16 V
      L110-9 (CANH) - L110-10 (CANL) Y - W CAN communication line Engine switch off 54 to 69 Ω
      L110-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    2. Connect the L48*1 or L110*2 tire pressure warning ECU and receiver connector.


      • *1: except RHD and w/ Light Auto Turn-off System (w/ Delay Function)

      • *2: for RHD and w/ Light Auto Turn-off System (w/ Delay Function)

    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.

      B006A8JC79
      *A except RHD and w/ Light Auto Turn-off System (w/ Delay Function) *B for RHD and w/ Light Auto Turn-off System (w/ Delay Function)
      *a

      Component with harness connected

      (Tire Pressure Warning ECU and Receiver)

      		 - -
      except RHD and w/ Light Auto Turn-off System (w/ Delay Function):
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      L48-3 (CLSW) - L48-12 (GND) W - W-B Tire pressure warning reset switch

      • Engine switch on (IG)

      • Steering pad switch assembly operated, "Change tire pressure" selected on the multi-information display and "ENTER" switch (steering pad switch assembly) pressed and held

      		 Below 1.5 V

      • Engine switch on (IG)

      • "ENTER" switch (steering pad switch assembly) off

      		 8 to 15 V
      L48-4 (RDA) - L48-12 (GND) GR - W-B Output signals Engine switch on (IG) Pulse generation (see waveform 1)
      L48-5 (PRG) - L48-12 (GND) L - W-B Input signals Engine switch on (IG) Pulse generation (see waveform 1)
      for RHD and w/ Light Auto Turn-off System (w/ Delay Function):
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      L110-3 (CLSW) - L110-12 (GND) W - W-B Tire pressure warning reset switch

      • Engine switch on (IG)

      • Steering pad switch assembly operated, "Change tire pressure" selected on the multi-information display and "ENTER" switch (steering pad switch assembly) pressed and held

      		 Below 1.5 V

      • Engine switch on (IG)

      • "ENTER" switch (steering pad switch assembly) off

      		 8 to 15 V
      L110-4 (RDA2) - L110-12 (GND) GR - W-B Output signals Engine switch on (IG) Pulse generation (see waveform 1)
      L110-5 (PRG2) - L110-12 (GND) L - W-B Input signals Engine switch on (IG) Pulse generation (see waveform 1)
    4. B006BGVC03
      *a Example
      *b GND

      Using an oscilloscope, check waveform 1.

      Waveform 1:
      Item Contents
      Terminal

      L48-4 (RDA) - L48-12 (GND)*1

      L110-4 (RDA2) - L110-12 (GND)*2

      L48-5 (PRG) - L48-12 (GND)*1

      L110-5 (PRG2) - L110-12 (GND)*2
      Tool setting 5 V/DIV, 5 ms./DIV.
      Vehicle condition Engine switch on (IG)

      • *1: except RHD and w/ Light Auto Turn-off System (w/ Delay Function)

      • *2: for RHD and w/ Light Auto Turn-off System (w/ Delay Function)

      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.