TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU


  1. CHECK TIRE PRESSURE WARNING ECU AND RECEIVER


    1. Disconnect the tire pressure warning ECU and receiver M11*1 or M30*2 connector and measure the voltage or resistance on the wire harness side.


      • *1: for Air Bag Caution Label with "9L" Identification Mark

      • *2: except Air Bag Caution Label with "9L" Identification Mark

      for Air Bag Caution Label with "9L" Identification Mark
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      M11-1 (IG) - M11-12 (E) L - W-B IG power source Ignition switch ON 10 to 16 V
      M11-7 (+B) - M11-12 (E) R - W-B Power supply (from battery) Always 10 to 16 V
      M11-12 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      except Air Bag Caution Label with "9L" Identification Mark
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      M30-1 (IG) - M30-12 (GND) L - W-B IG power source Ignition switch ON 10 to 16 V
      M30-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    2. Connect the tire pressure warning ECU and receiver M11*1 or M30*2 connector.


      • *1: for Air Bag Caution Label with "9L" Identification Mark

      • *2: except Air Bag Caution Label with "9L" Identification Mark

    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 have a malfunction.

      Tech Tips

      Inspect the connectors from the back side while the connectors are connected.

      A01QOP5C25
      *A for Air Bag Caution Label with "9L" Identification Mark *B except Air Bag Caution Label with "9L" Identification Mark
      *a

      Component with harness connected

      (Tire Pressure Warning ECU and Receiver)

      		 - -
      for Air Bag Caution Label with "9L" Identification Mark
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      M11-3 (CLSW) - M11-12 (E) V - W-B 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
      M11-4 (RDA) - M11-12 (E) G - W-B Output signals Ignition switch ON Pulse generation (see waveform 1)
      M11-5 (PRG) - M11-12 (E) W - W-B Input signals Ignition switch ON Pulse generation (see waveform 1)
      except Air Bag Caution Label with "9L" Identification Mark
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      M30-3 (CLSW) - M30-12 (GND) V - W-B 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
      M30-4 (RDA2) - M30-12 (GND) G - W-B Output signals Ignition switch ON Pulse generation (see waveform 1)
      M30-5 (PRG2) - M30-12 (GND) W - W-B Input signals Ignition switch ON Pulse generation (see waveform 1)
    4. A01QPY7C02
      *a Example
      *b GND

      Using an oscilloscope, check waveform 1.

      Waveform 1:
      Item Contents
      Terminal

      M11-4 (RDA) - M11-12 (E)*1

      M11-5 (PRG) - M11-12 (E)*1

      M30-4 (RDA2) - M30-12 (GND)*2

      M30-5 (PRG2) - M30-12 (GND)*2
      Tool setting 5 V/DIV, 5 ms./DIV.
      Vehicle condition Ignition switch ON

      • *1: for Air Bag Caution Label with "9L" Identification Mark

      • *2: except Air Bag Caution Label with "9L" Identification Mark

      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.