TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU


  1. CHECK TIRE PRESSURE WARNING ECU AND RECEIVER


    1. A000R2IE03
      Text in Illustration
      *A except AWL10R-BEXQHQ and GWL10R-BEXQBQ
      *B for AWL10R-BEXQHQ and GWL10R-BEXQBQ
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)

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

      except AWL10R-BEXQHQ and GWL10R-BEXQBQ
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      T32-1 (IG) - T32-12 (GND) LG - W-B IG power source Power switch on (IG) 10 to 16 V
      T32-7 (+B) - T32-12 (GND) W - W-B Power supply (from auxiliary battery) Always 10 to 16 V
      T32-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      for AWL10R-BEXQHQ and GWL10R-BEXQBQ
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      U22-1 (IG) - U22-12 (GND) L - W-B IG power source Power switch on (IG) 10 to 16 V
      U22-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    2. Connect the 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 have a malfunction.

      Tech Tips

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

      A000SZ8E02
      Text in Illustration
      *A except AWL10R-BEXQHQ and GWL10R-BEXQBQ *B for AWL10R-BEXQHQ and GWL10R-BEXQBQ
      *a

      Component with harness connected

      (Tire Pressure Warning ECU and Receiver)

      		 - -
      except AWL10R-BEXQHQ and GWL10R-BEXQBQ
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      T32-3 (CLSW) - T32-12 (GND) B - W-B Tire pressure warning reset switch

      • Power switch on (IG)

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

      		 Below 1.5 V

      • Power switch on (IG)

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

      		 8 to 15 V
      T32-4 (RDA) - T32-12 (GND) GR - W-B Output signals Power switch on (IG) Pulse generation (see waveform 1)
      T32-5 (PRG) - T32-12 (GND) L - W-B Input signals Power switch on (IG) Pulse generation (see waveform 1)

      T32-8 (ALSI) - T32-12 (GND)

      (*)

      		 V - W-B Tire pressure monitor initiator driver Power switch on (IG) Pulse generation (see waveform 1)

      • *: w/ Tire Inflation Pressure Display Function

      for AWL10R-BEXQHQ and GWL10R-BEXQBQ
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      U22-3 (CLSW) - U22-12 (GND) Y - W-B Tire pressure warning reset switch

      • Power switch on (IG)

      • Steering pad switch assembly operated, "TPMS" selected on the multi-nformation display and "ENTER" switch (steering pad switch assembly) pressed and held

      		 Below 1.5 V

      • Power switch on (IG)

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

      		 8 to 15 V
      U22-4 (RDA2) - U22-12 (GND) GR - W-B Output signals Power switch on (IG) Pulse generation (see waveform 1)
      U22-5 (PRG2) - U22-12 (GND) L - W-B Input signals Power switch on (IG) Pulse generation (see waveform 1)
    4. A000PASE06
      Text in Illustration
      *a Example
      *b GND

      Using an oscilloscope, check waveform 1.

      Waveform 1:
      Item Contents
      Terminal

      T32-4 (RDA) - T32-12 (GND)*1

      T32-5 (PRG) - T32-12 (GND)*1

      T32-8 (ALSI) - T32-12 (GND)*1

      U22-4 (RDA2) - U22-12 (GND)*2

      U22-5 (PRG2) - U22-12 (GND)*2
      Tool setting 5 V/DIV, 5 ms./DIV.
      Vehicle condition Power switch on (IG)

      • *1: except AWL10R-BEXQHQ and GWL10R-BEXQBQ

      • *2: for AWL10R-BEXQHQ and GWL10R-BEXQBQ

      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.