TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU


  1. CHECK TIRE PRESSURE WARNING ECU AND RECEIVER


    1. A01I1L5E26
      Text in Illustration
      *A w/o Intuitive Parking Assist System with Smart Key System
      *B w/o Intuitive Parking Assist System without Smart Key System
      *C w/ Intuitive Parking Assist System
      *a Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver)

      Disconnect the O25, O33 or N41 tire pressure warning ECU and receiver connector and measure the voltage and resistance on the wire harness side.

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

      O25-1 (IG) - O25-12 (GND)*1

      O33-1 (IG) - O33-12 (GND)*2

      N41-1 (IG) - N41-12 (GND)*3

      		 V - BR IG power source Ignition switch ON 10 to 16 V

      O25-12 (GND) - Body ground*1

      O33-12 (GND) - Body ground*2

      N41-12 (GND) - Body ground*3

      		 BR - Body ground Ground Always Below 1 Ω

    2. Connect the O25, O33 or N41 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.

      A01HZLKE82
      Text in Illustration
      *A w/o Intuitive Parking Assist System with Smart Key System *B w/o Intuitive Parking Assist System without Smart Key System
      *C w/ Intuitive Parking Assist System - -
      *a Component with harness connected (Tire Pressure Warning ECU and Receiver) - -
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition

      O25-3 (CLSW) - O25-12 (GND)*1*4

      O33-3 (CLSW) - O33-12 (GND)*2*4

      		 R - BR Tire pressure warning reset switch

      • Ignition switch ON

      • Tire pressure warning reset switch on

      		 Below 1.5 V

      • Ignition switch ON

      • Tire pressure warning reset switch off

      		 8 to 15 V

      O25-4 (RDA) - O25-12 (GND)*1

      O33-4 (RDA) - O33-12 (GND)*2

      N41-4 (RDA) - N41-12 (GND)*3

      		 L - BR Output signals Ignition switch ON Pulse generation (see waveform 1)

      O25-5 (PRG) - O25-12 (GND)*1

      O33-5 (PRG) - O33-12 (GND)*2

      N41-5 (PRG) - N41-12 (GND)*3

      		 P - BR Input signals Ignition switch ON Pulse generation (see waveform 1)

      O25-9 (CANH) - O25-10 (CANL)*1*4

      O33-9 (CANH) - O33-10 (CANL)*2*4

      		 BE - W CAN communication line Ignition switch off 54 to 69 Ω

      • *1: w/o Intuitive Parking Assist System with Smart Key System

      • *2: w/o Intuitive Parking Assist System without Smart Key System

      • *3: w/ Intuitive Parking Assist System

      • *4: w/ Tire Inflation Pressure Display Function

    4. A01HZJAE01
      Text in Illustration
      *a Example
      *b GND

      Using an oscilloscope, check waveform 1.

      Waveform 1:
      Item Contents
      Terminal

      O25-4 (RDA) - O25-12 (GND)*1

      O33-4 (RDA) - O33-12 (GND)*2

      N41-4 (RDA) - N41-12 (GND)*3

      O25-5 (PRG) - O25-12 (GND)*1

      O33-5 (PRG) - O33-12 (GND)*2

      N41-5 (PRG) - N41-12 (GND)*3
      Tool setting 5 V/DIV, 50 μs./DIV.
      Vehicle condition Ignition switch ON

      • *1: w/o Intuitive Parking Assist System with smart key system

      • *2: w/o Intuitive Parking Assist System without smart key system

      • *3: w/ Intuitive Parking Assist System

      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.