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Terminals Of Ecu

  1. ARRANGEMENT OF MAYDAY ECU TERMINAL 
    MAYDAY ECU TERMINAL

    Symbols (Terminal No.) Wiring Color Terminal Description
    +B (R24-1) L Vehicle battery power supply
    SPO+ (R24-2) LG Audio speaker output +
    SPO- (R24-3) L Audio speaker output -
    TACC (R24-7) R Microphone power supply
    MCI+ (R24-8) Y Microphone input signal +
    MCI- (R24-9) BR Microphone input signal -
    SPI+ (R24-10) L Sound signal
    SPI- (R24-11) LG Sound signal
    E (R24-12) W-B Ground
    IG2 (R24-13) GR IG power supply
    ACC (R24-14) LG ACC power supply
    GSW (R24-16) Y Airbag signal
    MCO+ (R24-17) Y Microphone output
    MCO- (R24-18) BR Audio ground
    SG (R24-19) Shielded Shield ground
    HFOF (R24-21) O Phone mute
    MUTE (R24-22) L Radio mute
    MPX1 (R24-23) L MPX line
    BBI+ (R23-2) B Mayday battery input
    IND1 (R23-4) LG Red LED output
    SIG1 (R23-5) P Mayday switch input
    BBI- (R23-9) W Mayday battery input
    IND2 (R23-11) L Green LED output
    SIG- (R23-12) G Mayday switch ground
    SIG2 (R23-13) O Mayday switch input
    WFSE (R23-14) G DLC3 line
    SIL (R23-15) R DLC3 line
  2. CHECK MAYDAY ECU 
    Fig 1: Identifying Mayday ECU Connectors
    G04945791Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R24 and R23 ECU connectors.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      MAYDAY ECU TERMINALS SPECIFIED CONDITION RESISTANCE AND VOLTAGE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      R24-12 (E)-Body ground BR - Body ground Ground Always Below 1 Ω
      R24-1 (+B) - Body ground L - Body ground Vehicle battery power supply Always 11 to 14 V
      R24-14(ACC)-Body ground LG - Body ground ACC power supply Engine switch on (ACC) 11 to 14 V
      R24-13 (IG2)-Body ground GR - Body ground IG power supply Engine switch on (IG) 11 to 14 V
      R24-10 (SPI+)-R24-12 (E) L-W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      R24-11 (SPI-)-R24-12(E) LG - W-B Sound signal Audio system is playing Waveform synchronized with sound is output
      R24-21 (HFOF)-R24-12 (E) O-W-B Phone mute Engine switch on (IG) 3.3 to 5.0 V
      R24-22 (MUTE)-R24-12 (E) L-W-B Radio mute Engine switch on (IG) Approx. 5 V
      R23-2 (BBI+) - R24-9 (BBI-) B-W Non-rechargeble back-up Always 9 to 16 V
      R23-4(IND1)-R23-12 (SIG-) LG-G Red LED output Engine switch off Approx. 56 kΩ
      R23-5(SIG1)-R23-12 (SIG-) P-G Mayday switch input Engine switch off, all buttons not pushed Approx. 4.7 kΩ
      R23-11 (IND2)-R23-12 (SIG-) L-G Green LED output Engine switch off Approx. 56 kΩ
      R23-13(SIG2)-R23-12 (SIG-) O-G Mayday switch input Engine switch off, all buttons not pushed Approx. 4.7 kΩ

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Disconnect the B telephone antenna (cellular phone) connector (color: blue) from the ECU.
    4. Measure the resistance according to the value(s) in the table below.
      MAYDAY ECU TERMINALS SPECIFIED CONDITION RESISTANCE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      B-1 (SIGNAL) - Body ground B - Body ground Telephone signal input / output Always Approx. 10 KΩ

      If the result is not as specified, there may be a malfunction on the antenna side.

  3. CHECK BUS BUFFER ECU 
    Fig 2: Identifying Bus Buffer ECU Connector
    G04945792Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L93 ECU connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      BUS BUFFER ECU TERMINALS SPECIFIED CONDITION RESISTANCE AND VOLTAGE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L93-4 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L93-3 (+B) - Body ground R - Body ground Battery power supply Always 11 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the L93 ECU connector.
    4. Measure the voltage according to the value(s) in the table below.
      BUS BUFFER ECU TERMINALS SPECIFIED CONDITION VOLTAGE

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L93-5 (S1)-L93-4(GND) L-W-B MPX line Always Pulse generation

      If the result is not as specified, the ECU may have a malfunction.

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