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TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU

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  1. CHECK TIRE PRESSURE WARNING ECU AND RECEIVER


    1. A01X0XEE02

      Disconnect the L65*1 or L75*2 tire pressure warning ECU and receiver connector and measure the voltage and resistance on the wire harness side.


      • *1: w/o Front Antenna

      • *2: w/ Front Antenna

      Table 1. Text in Illustration
      *A w/o Front Antenna
      *B w/ Front Antenna
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition

      L65-1 (IG) - L65-12 (GND)*1

      L75-1 (IG) - L75-12 (GND)*2

      		 B - BR IG power source Engine switch on (IG) 10 to 16 V
      L65-7 (+B) - L65-12 (GND)*1 R - BR Power supply (from battery) Always 10 to 16 V

      L65-9 (CANH) - L65-10 (CANL)*1

      L75-9 (CANH) - L75-10 (CANL)*2

      		 R - W CAN communication line Engine switch off 54 to 69 Ω

      L65-12 (GND) - Body ground*1

      L75-12 (GND) - Body ground*2

      		 BR - Body ground Ground Always Below 1 Ω

      • *1: w/o Front Antenna

      • *2: w/ Front Antenna

    2. Connect the L65*1 or L75*2 tire pressure warning ECU and receiver connector.


      • *1: w/o Front Antenna

      • *2: w/ Front Antenna

    3. A01X860E02

      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.

      Tip:

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

      Table 2. Text in Illustration
      *A w/o Front Antenna *B w/ Front Antenna
      *a

      Component with harness connected

      (Tire Pressure Warning ECU and Receiver)

      		 - -
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition

      L65-3 (CLSW) - L65-12 (GND)*1

      L75-3 (CLSW) - L75-12 (GND)*2

      		 W - BR Tire pressure warning reset switch

      • Engine switch on (IG)

      • Tire pressure warning reset switch on

      		 Below 1.5 V

      • Engine switch on (IG)

      • Tire pressure warning reset switch off

      		 8 to 15 V

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

      L75-4 (RDA2) - L75-12 (GND)*2

      		 G - BR Output signals Engine switch on (IG) Pulse generation (see waveform 1)

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

      L75-5 (PRG2) - L75-12 (GND)*2

      		 L - BR Input signals Engine switch on (IG) Pulse generation (see waveform 1)

      • *1: w/o Front Antenna

      • *2: w/ Front Antenna

    4. A01X41NE01

      Using an oscilloscope, check waveform 1.

      Table 3. Text in Illustration
      *a Example
      *b GND
      Table 4. Waveform 1:
      Item Contents
      Terminal

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

      L75-4 (RDA2) - L75-12 (GND)*2

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

      L75-5 (PRG2) - L75-12 (GND)*2
      Tool setting 5 V/DIV, 50 μs./DIV.
      Vehicle condition Engine switch on (IG)

      • *1: w/o Front Antenna

      • *2: w/ Front Antenna

      Tip:

      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.