FixVault
Home › Lexus › 2009 › LS 600hL › Repair and Diagnosis › External Pages › Different car › Section 51 (Cellular Communication) › LEXUS Link System › Terminals Of Ecu

Terminals Of Ecu

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
  1. ARRANGEMENT OF MAYDAY ECU TERMINAL 
    MAYDAY ECU TERMINAL REFERENCE

    Terminal No. (Symbols) Wiring Color Terminal Description
    R24-1 (+B) R Vehicle battery power supply
    R24-2 (SPO+) L Audio speaker output +
    R24-3 (SPO-) LG Audio speaker output -
    R24-7 (TACC) R Microphone power supply
    R24-8 (MCI+) Y Microphone input signal +
    R24-9 (MCI-) BR Microphone input signal -
    R24-10 (SPI+) L Sound signal
    R24-11 (SPI-) LG Sound signal
    R24-12 (E) BR Ground
    R24-13 (IG2) GR IG power supply
    R24-14 (ACC) LG ACC power supply
    R24-16 (GSW) L Airbag signal
    R24-17 (MCO+) Y Microphone output
    R24-18 (MCO-) BR Audio ground
    R24-19 (SG) Shielded Shield ground
    R24-21 (HFOF) O Phone mute
    R24-22 (MUTE) L Radio mute
    R24-23 (MPX1) L MPX line
    R23-2 (BBI+) B Mayday battery input
    R23-4 (IND1) LG Red LED output
    R23-5 (SIG1) P Mayday switch input
    R23-9 (BBI-) W Mayday battery input
    R23-11 (IND2) L Green LED output
    R23-12 (SIG-) G Mayday switch ground
    R23-13 (SIG2) O Mayday switch input
    R23-14 (WFSE) G DLC3 line
    R23-15 (SIL) 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
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      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 R - Body ground Vehicle battery power supply Always 11 to 14 V
      R24-14 (ACC) - Body ground LG - Body ground ACC power supply Power switch ON (ACC) 11 to 14 V
      R24-13 (IG2) - Body ground GR - Body ground IG power supply Power switch ON (IG) 11 to 14 V
      R24-10 (SPI+) - R24-12 (E) L-BR Sound signal Audio system is playing Waveform synchronized with sound is output
      R24-11 (SPI-) - R24-12 (E) LG-BR Sound signal Audio system is playing Waveform synchronized with sound is output
      R24-21 (HFOF) - R24-12 (E) O-BR Phone mute Power switch ON (IG) 3 3 to 5 0 V
      R24-22 (MUTE) - R24-12 (E) L-BR Radio mute Power switch ON (IG) 3 3 to 5 0 V
      R23-2 (BBI+) - R23-9 (BBI-) B-W Non-rechargeable backup Always 9 to 16 V
      R23-5 (SIG1) - R23-12 (SIG-) P-G Mayday switch input Power switch OFF, all buttons not pushed 4 4 to 5 0 kΩ
      R23-13 (SIG2) - R23-12 (SIG-) O-G Mayday switch input Power switch OFF, all buttons not pushed 4 4 to 5 0 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
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      B-1 (SIGNAL) - Body ground B - Body ground Telephone signal input / output Always 4 to 11 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.
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      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
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      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.

About FixVault