TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU

  1. C279757C20

    *A

    for Air Bag Caution Label with "9L" Identification Mark

    *B

    except Air Bag Caution Label with "9L" Identification Mark for ECE-R64 Type

    *C

    except Air Bag Caution Label with "9L" Identification Mark for FMVSS138 Type

    -

    -

    *a

    Front view of wire harness connector

    (to Tire Pressure Warning ECU and Receiver)

    -

    -

    CHECK TIRE PRESSURE WARNING ECU AND RECEIVER

    1. Disconnect the tire pressure warning ECU and receiver M11*1, *3 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 ECE-R64 Type

      • *3: except Air Bag Caution Label with "9L" Identification Mark for FMVSS138 Type

      Table 1. for Air Bag Caution Label with "9L" Identification Mark, except Air Bag Caution Label with "9L"Identification Mark for FMVSS138 Type

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      M11-1 (IG) - M11-12 (E)

      L - W-B

      IG power source

      Power switch on (IG)

      10 to 16 V

      M11-7 (+B) - M11-12 (E)

      R - W-B

      Power supply (from auxiliary battery)

      Always

      10 to 16 V

      M11-12 (E) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω
      Table 2. except Air Bag Caution Label with "9L" Identification Mark for ECE-R64 Type

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      M30-1 (IG) - M30-12 (GND)

      L - W-B

      IG power source

      Power switch on (IG)

      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, *3 or M30*2 connector.

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

      • *2: except Air Bag Caution Label with "9L" Identification Mark for ECE-R64 Type

      • *3: except Air Bag Caution Label with "9L" Identification Mark for FMVSS138 Type

    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.

      Tip:

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

      E129452C47

      *A

      for Air Bag Caution Label with "9L" Identification Mark

      *B

      except Air Bag Caution Label with "9L" Identification Mark for ECE-R64 Type

      *C

      except Air Bag Caution Label with "9L" Identification Mark for FMVSS138 Type

      -

      -

      *a

      Component with harness connected

      (Tire Pressure Warning ECU and Receiver)

      -

      -
      Table 3. for Air Bag Caution Label with "9L" Identification Mark, except Air Bag Caution Label with "9L"Identification Mark for FMVSS138 Type

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      M11-3 (CLSW) - M11-12 (E)

      V - W-B

      Tire pressure warning reset switch

      • Power switch on (IG)

      • Tire pressure warning reset switch ON

      Below 1.5 V

      • Power switch on (IG)

      • Tire pressure warning reset switch OFF

      8 to 15 V

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

      G - W-B

      Output signals

      Power switch on (IG)

      Pulse generation (see waveform 1)

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

      W - W-B

      Input signals

      Power switch on (IG)

      Pulse generation (see waveform 1)
      Table 4. except Air Bag Caution Label with "9L" Identification Mark for ECE-R64 Type

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      M30-3 (CLSW) - M30-12 (GND)

      V - W-B

      Tire pressure warning reset switch

      • Power switch on (IG)

      • Tire pressure warning reset switch ON

      Below 1.5 V

      • Power switch on (IG)

      • Tire pressure warning reset switch OFF

      8 to 15 V

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

      G - W-B

      Output signals

      Power switch on (IG)

      Pulse generation (see waveform 1)

      M30-5 (PRG2) - M30-12 (GND)

      W - W-B

      Input signals

      Power switch on (IG)

      Pulse generation (see waveform 1)
    4. C240058C02

      *a

      Example

      *b

      GND

      Using an oscilloscope, check waveform 1.

      Table 5. Waveform 1:

      Item

      Contents

      Terminal

      M11-4 (RDA) - M11-12 (E)*1, *3

      M11-5 (PRG) - M11-12 (E)*1, *3

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

      M30-5 (PRG2) - M30-12 (GND)*2

      Tool setting

      5 V/DIV, 5 ms./DIV.

      Vehicle condition

      Power switch on (IG)

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

      • *2: except Air Bag Caution Label with "9L" Identification Mark for ECE-R64 Type

      • *3: except Air Bag Caution Label with "9L" Identification Mark for FMVSS138 Type

      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.