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Terminals Of Ecu

  1. INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (BODY ECU) 
    Fig 1: Instrument Panel Junction Block Chart
    G05273730Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    VOLTAGE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    ACC, IG (1A-1) - GND1 (1F-10) B - W-B Battery (Power source circuit) Always 10 to 14 V
    PKB (1C-14) - GND1 (1F-10) B - W-B Parking brake switch Parking brake is depressed Below 1 V
    PKB (1C-14) - GND1 (1F-10) B - W-B Parking brake switch Parking brake is released 10 to 14 V
    HRLY (1D-3) - GND1 (1F-10) GR - W-B HEAD Relay (HEAD signal) Light control switch is OFF or TAIL 10 to 14 V
    HRLY (1D-3) - GND1 (1F-10) GR - W-B HEAD Relay (HEAD signal) Light control switch is HEAD Below 1 V
    DRL (1D-9) - GND1 (1F-10) P - W-B DRL Relay (DRL signal) Ignition switch is ON and engine is running Below 1 V
    DRL (1D-9) - GND1 (1F-10) P - W-B DRL Relay (DRL signal) Ignition switch is OFF 10 to 14 V
    BECU (1D-10) - GND1 (1F-10) W - W-B Battery (B+ circuit) Always 10 to 14 V
    ALTB (1D-16) - GND1 (1F-10) W - W-B Battery Always 10 to 14 V
    MPX1 (1E-7) - GND1 (1F-10) BR - W-B Multiplex communication Ignition switch is OFF Below 1 V
    MPX1 (1E-7) - GND1 (1F-10) BR - W-B Multiplex communication Ignition switch is ON Signal waveform
    BECU (1F-1) - GND1 (1F-10) SB - W-B Overhead ECU (B+ circuit) Always 10 to 14 V
    GND1 (1F-10) - Body ground W-B - Body ground Body ground Always Below 1 V
    HRLY (1H-13) - GND1 (1F-10) R - W-B Headlight cleaner switch (HEAD signal) Light control switch is OFF or TAIL 10 to 14 V
    HRLY (1H-13) - GND1 (1F-10) R - W-B Headlight cleaner switch (HEAD signal) Light control switch is HEAD Below 1 V
    ILE (1I-10) - GND1 (1F-10) R - W-B Key cylinder light (Illumination signal) Ignition key cylinder light is OFF 10 to 14 V
    ILE (1I-10) - GND1 (1F-10) R - W-B Key cylinder light (Illumination signal) Ignition key cylinder light is ON Below 1 V
    TRLY (1L-3) - GND1 (1F-10) Y - W-B TAIL relay (TAIL signal) Light control switch is OFF Below 1 V
    TRLY (1L-3) - GND1 (1F-10) Y - W-B TAIL relay (TAIL signal) Light control switch is TAIL and fog light switch is ON 10 to 14 V
    GND2 (1M-9) - GND1 (1F-10) W-B - W-B Body ground Always Below 1 V
    HU (1N-2) - GND1 (1F-10) G - W-B Headlight dimmer switch (HIGH signal) Headlight dimmer switch is LOW 10 to 14 V
    HU (1N-2) - GND1 (1F-10) G - W-B Headlight dimmer switch (HIGH signal) Headlight dimmer switch is HIGH Below 1 V
    LCTY (1O-7) - GND1 (1F-10) B - W-B Courtesy switch (Rear left door circuit) Rear left door is open Below 1 V
    LCTY (1O-7) - GND1 (1F-10) B - W-B Courtesy switch (Rear left door circuit) Rear left door is closed Pulse generation (*1)
    LSWL (1P-5) - GND1 (1F-10) GR - W-B Door lock position switch (Rear left door circuit) Rear left door is in unlock position Below 1 V
    LSWL (1P-5) - GND1 (1F-10) GR - W-B Door lock position switch (Rear left door circuit) Rear left door is in lock position Pulse generation (*1)
    ILE (1R-5) - GND1 (1F-10) SB - W-B Front interior illumination (Illumination signal) Front interior light is OFF 10 to 14 V
    ILE (1R-5) - GND1 (1F-10) SB - W-B Front interior illumination (Illumination signal) Front interior light is ON Below 1 V
    MPX1 (1E-7) - GND1 (1F-10) BR - W-B Multiplex communication signal Ignition switch is OFF Below 1 V
    MPX1 (1E-7) - GND1 (1F-10) BR - W-B Multiplex communication signal Ignition switch is ON Signal waveform
    HDLO (B7-4) - GND1 (1F-10) SB - W-B Headlight cleaner relay (DRL signal) Ignition switch is ON and engine is running 10 to 14 V
    HDLO (B7-4) - GND1 (1F-10) SB - W-B Headlight cleaner relay (DRL signal) Ignition switch is OFF Below 1 V
    FFGO (B7-7) - GND1 (1F-10) LG - W-B Front fog relay (Front fog circuit) Front fog light is OFF Below 1 V
    FFGO (B7-7) - GND1 (1F-10) LG - W-B Front fog relay (Front fog circuit) Front fog light is ON 10 to 14 V
    DCYL (B6-13) - GND1 (1F-10) SB - W-B Courtesy light (Front left door circuit) Front left courtesy light is OFF 10 to 14 V
    DCYL (B6-13) - GND1 (1F-10) SB - W-B Courtesy light (Front left door circuit) Front let courtesy light N Below 1V
    DCTY (B6-14) - GND1 (1F-10) L - W-B Courtesy switch (Front left door circuit) Front left door is open Below 1 V
    DCTY (B6-14) - GND1 (1F-10) L - W-B Courtesy switch (Front left door circuit) Front left door is closed 10 to 14 V
    RCTY (B6-16) - GND1 (1F-10) GR - W-B Courtesy switch (Rear right door circuit) Rear right door is open Below 1 V
    RCTY (B6-16) - GND1 (1F-10) GR - W-B Courtesy switch (Rear right door circuit) Rear right door is closed Pulse generation (*1)
    CLTE (B4-4) - GND1 (1F-10) LG - W-B Automatic light control sensor (Ground circuit) Always Below 1 V
    CLTS (B4-5) - GND1 (1F-10) B - W-B Automatic light control sensor (Signal circuit) Ignition switch is ON Below 1 V
    CLTS (B4-5) - GND1 (1F-10) B - W-B Automatic light control sensor (Signal circuit) Ignition switch is OFF 10 to 14 V
    CLTB (B4-6) - GND1 (1F-10) P - W-B Automatic light control sensor (Power source circuit) Ignition switch is OFF 10 to 14 V
    CLTB (B4-6) - GND1 (1F-10) P - W-B Automatic light control sensor (Power source circuit) Ignition switch is ON Below 1 V
    HF(B4-15) - GND1 (1F-10) Y - W-B Headlight dimmer switch (FLASH signal) Headlight dimmer switch is OFF 10 to 14 V
    HF(B4-15) - GND1 (1F-10) Y - W-B Headlight dimmer switch (FLASH signal) Headlight dimmer switch is FLASH Below 1 V
    A(B4-16) - GND1 (1F-10) BR - W-B Light control switch (AUTO signal) Light control switch is OFF 10 to 14 V
    A(B4-16) - GND1 (1F-10) BR - W-B Light control switch (AUTO signal) Light control switch is AUTO Below 1 V
    TAIL (B4-17) - GND1 (1F-10) O - W-B Light control switch (TAIL signal) Light control switch is OFF 10 to 14 V
    TAIL (B4-17) - GND1 (1F-10) O - W-B Light control switch (TAIL signal) Light control switch is TAIL Below 1 V
    FFOG (B4-22) -GND1 (1F-10) P - W-B Front fog light switch (Front fog light signal) Fog light switch is OFF 10 to 14 V
    FFOG (B4-22) -GND1 (1F-10) P - W-B Front fog light switch (Front fog light signal) Fog light switch is ON Below 1 V
    HEAD (B4-23) - GND1 (1F-10) V - W-B Light control switch (HEAD signal) Light control switch is OFF Below 1 V
    HEAD (B4-23) - GND1 (1F-10) V - W-B Light control switch (HEAD signal) Light control switch is HEAD 10 to 14 V
    LSWR (B5-5) - GND1 (1F-10) B - W-B Door lock position switch (Rear right door circuit) Rear right door is in unlock position Below 1 V
    LSWR (B5-5) - GND1 (1F-10) B - W-B Door lock position switch (Rear right door circuit) Rear right door is in lock position Pulse generation (*1)
    CSPT (B5-14) - GND1 (1F-10) G - W-B Overhead illumination circuit Overhead console illumination is OFF 10 to 14 V
    CSPT (B5-14) - GND1 (1F-10) G - W-B Overhead illumination circuit Overhead console illumination is ON Below 1 V
    FSPT (B5-15) - GND1 (1F-10) LG - W-B Step light, inside handle illumination circuit Inside handle illumination and step light are OFF 10 to 14 V
    FSPT (B5-15) - GND1 (1F-10) LG - W-B Step light, inside handle illumination circuit Inside handle illumination and step light are ON Below 1 V
    MPX2 (B5-21) - GND1 (1F-10) O - W-B Multiplex communication signal Ignition switch is OFF Below 1 V
    MPX2 (B5-21) - GND1 (1F-10) O - W-B Multiplex communication signal Ignition switch is ON Signal waveform
    PCTY (B5-23) - GND1 (1F-10) L - W-B Courtesy switch (Front right door circuit) Front right door is open Below 1 V
    PCTY (B5-23) - GND1 (1F-10) L - W-B Courtesy switch (Front right door circuit) Front right door is closed 10 to 14V
    PCYL (B5-24) - GND1 (1F-10) SB - W-B Courtesy light (Front right door circuit) Front right courtesy light is OFF 10 to 14 V
    PCYL (B5-24) - GND1 (1F-10) SB - W-B Courtesy light (Front right door circuit) Front right courtesy light is ON Below 1 V
    BCTY (B5-25) - GND1 (1F-10) P - W-B Courtesy switch (Back door circuit) Back door is open Below 1 V
    BCTY (B5-25) - GND1 (1F-10) P - W-B Courtesy switch (Back door circuit) Back door is closed 10 to 14 V
    LSWP (B5-27) - GND1 (1F-10) Y - W-B Door lock position switch (Front right door circuit) Front right door is in unlock position Below 1 V
    LSWP (B5-27) - GND1 (1F-10) Y - W-B Door lock position switch (Front right door circuit) Front right door is in lock position 10 to 14 V
    1. *1: Oscilloscope wave

      HINT:

      • Gauge set: 5 V/DIV. 5 ms/DIV
      • Condition: Ignition switch ON
        • Fig 2: Identifying Waveform
        G05273731Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. HEADLIGHT BEAM LEVEL CONTROL ECU 
    Fig 3: Identifying Headlight Beam Level Control ECU Connector Terminal
    G05273732Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    VOLTAGE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    GND (H17-1) - Body ground W-B - Body ground Body ground Always Below 1 V
    SPDL (H17-5) - GND (H17-1) P - W-B Skid control ECU (Vehicle speed signal) Drive at about 30 km/h (19 mph) Pulse generation (*1)
    SPDR (H17-6) - GND (H17-1) O - W-B Skid control ECU (Vehicle speed signal) Drive at about 30 km/h (19 mph) Pulse generation (*1)
    HDLP (H17-7) - GND (H17-1) GR - W-B Headlight relay (HEAD signal) Light control switch is OFF 10 to 14 V
    HDLP (H17-7) - GND (H17-1) GR - W-B Headlight relay (HEAD signal) Light control switch is HEAD Below 1 V
    RHG (H17-9) - GND (H17-1) B - W-B Headlight beam control actuator RH Always Below 1 V
    RH3 (H17-10) - GND (H17-1) V - W-B Headlight beam control actuator RH Ignition switch is OFF Below 1 V
    RH3 (H17-10) - GND (H17-1) V - W-B Headlight beam control actuator RH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    RH1 (H17-11) - GND (H17-1) R - W-B Headlight beam control actuator RH Ignition switch is OFF Below 1 V
    RH1 (H17-11) - GND (H17-1) R - W-B Headlight beam control actuator RH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    RH4 (H17-12) - GND (H17-1) W - W-B Headlight beam control actuator RH Ignition switch is OFF Below 1 V
    RH4 (H17-12) - GND (H17-1) W - W-B Headlight beam control actuator RH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    RH2 (H17-13) - GND (H17-1) BR - W-B Headlight beam control actuator RH Ignition switch is OFF Below 1 V
    RH2 (H17-13) - GND (H17-1) BR - W-B Headlight beam control actuator RH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    IG (H17-14) - GND (H17-1) P - W-B Ignition (Power source circuit) Ignition switch OFF Below 1 V
    IG (H17-14) - GND (H17-1) P - W-B Ignition (Power source circuit) Ignition switch ON 10 to 14 V
    SGR (H17-16) - GND (H17-1) V - W-B Height control sensor signal Always Below 1 V
    SHR (H17-18) - SGR (H17-16) W-V Height control sensor signal Ignition switch OFF Below 1 V
    SHR (H17-18) - SGR (H17-16) W-V Height control sensor signal Ignition switch ON, vehicle stationary and bounced 0.5 to 4.5 V
    SBR (H17-20) - SGR (H17-16) R-V Height control sensor signal Ignition switch OFF Below 1 V
    SBR (H17-20) - SGR (H17-16) R-V Height control sensor signal Ignition switch ON 4.5 to 5.5 V
    WNG (H17-21) - GND (H17-1) LG - W-B Combination meter (Indicator light circuit) Headlight beam warning light goes off 10 to 14 V
    WNG (H17-21) - GND (H17-1) LG - W-B Combination meter (Indicator light circuit) Headlight beam warning light comes on Below 1 V
    LHG (H17-22) - GND (H17-1) G - W-B Headlight beam control actuator LH Always Below 1 V
    LH3 (H17-23) - GND (H17-1) Y - W-B Headlight beam control actuator LH Ignition switch OFF Below 1 V
    LH3 (H17-23) - GND (H17-1) Y - W-B Headlight beam control actuator LH Engine running, light control switch in HEAD or DRL system ON, vehicle stationary and bounced Pulse generation (*2)
    LH1 (H17-24) - GND (H17-1) O - W-B Headlight beam control actuator LH Ignition switch OFF Below 1 V
    LH1 (H17-24) - GND (H17-1) O - W-B Headlight beam control actuator LH Engine running, light control switch in HEAD or DRL system ON, vehicle stationary and bounced Pulse generation (*2)
    LH4 (H17-25) - GND (H17-1) R - W-B Headlight beam control actuator LH Ignition switch OFF Below 1 V
    LH4 (H17-25) - GND (H17-1) R - W-B Headlight beam control actuator LH Engine running, light control switch in HEAD or DRL system ON, vehicle stationary and bounced Pulse generation (*2)
    LH2 (H17-26) - GND (H17-1) L-B - W-B Headlight beam control actuator LH Ignition switch OFF Below 1 V
    LH2 (H17-26) - GND (H17-1) L-B - W-B Headlight beam control actuator LH Engine running, light control switch in HEAD or DRL system ON, vehicle stationary and bounced Pulse generation (*2)
    1. *1: Oscilloscope wave

      HINT:

      • Terminal: SPDL - GND, SPDR - GND
      • Gauge set: 5 V/DIV. 2 ms/DIV
      • Condition: Drive at about 30 km/h (19 mph)
      Fig 4: Identifying Waveform 1
      G05273733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. *2: Oscilloscope wave

      HINT:

      • Terminal: RH1. RH2. RH3. RH4 - GND LH1. LH2. LH3. LH4 - GND
      • Gauge set: 5 V/DIV. 10 ms/DIV
      • Condition: The DRL system is on with the engine running or the light control switch is in the HEAD position when the vehicle is stationary or being bounced.

        If the value is not within the standard range, some defects on the vehicle side are possible. Inspect the fuse, wire harness and connector.

        • Fig 5: Identifying Waveform 2
        G05273734Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. AFS ECU 
    Fig 6: Identifying AFS ECU Connector Terminal
    G05273735Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    VOLTAGE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    E1 (A14-1) - Body ground W-B - Body ground Body ground Always Below 1 V
    IG (A14-2) - E1 (A14-1) P - W-B Ignition switch (Power source circuit) Ignition switch OFF Below 1 V
    IG (A14-2) - E1 (A14-1) P - W-B Ignition switch (Power source circuit) Ignition switch ON 10 to 14 V
    MSW (A14-4) - E1 (A14-1) LG - W-B AFS OFF switch AFS OFF switch is not pressed 4.5 to 5.5 V
    MSW (A14-4) - E1 (A14-1) LG - W-B AFS OFF switch AFS OFF switch is pressed Below 1 V
    MPX1 (A14-5) - E1 (A14-1) P - W-B Multiplex communication signal Ignition switch ON Signal waveform
    SS+ (A14-7) - SS- (A14-8) LG-L Steering sensor Engine idling, slowly turn steering wheel Pulse generation
    SHRL (A14-9) - SGR (A14-20) W-V Height control sensor rear RH (Vehicle height signal) Ignition switch OFF Below 1 V
    SHRL (A14-9) - SGR (A14-20) W-V Height control sensor rear RH (Vehicle height signal) Ignition switch ON, vehicle stationary and bounced 0.5 to 4.5 V
    SBR (A14-10) - SGR (A14-20) R-V Height control sensor rear RH (Vehicle height signal) Ignition switch OFF Below 1 V
    SBR (A14-10) - SGR (A14-20) R-V Height control sensor rear RH (Vehicle height signal) Ignition switch ON 4.5 to 5.5 V
    E1S (A14-11) - Body ground W-B - Body ground Body ground Always Below 1 V
    IGS (A14-12) - E1 (A14-1) P - W-B Ignition switch (Signal power source) Ignition switch OFF Below 1 V
    IGS (A14-12) - E1 (A14-1) P - W-B Ignition switch (Signal power source) Ignition switch ON 10 to 14 V
    SGR (A14-20) - E1 (A14-1) V - W-B Height control ECU (Vehicle height signal) Always Below 1 V (*3)
    SGR (A14-20) - E1 (A14-1) V - W-B Height control sensor rear RH (Vehicle height signal) Always Below 1 V (*4)
    SPDL (A15-6) - E1 (A14-1) P - W-B Skid control ECU (Vehicle speed signal) Drive at about 30 km/h (19 mph) Pulse generation (*1)
    SPDR (A15-7) - E1 (A14-1) O - W-B Skid control ECU (Vehicle speed signal) Drive at about 30 km/h (19 mph) Pulse generation (*1)
    SBLR (A15-9) - SBGR (A15-10) L-B Headlight swivel ECU RH Ignition switch OFF Below 1 V
    SBLR (A15-9) - SBGR (A15-10) L-B Headlight swivel ECU RH Ignition switch ON Signal waveform
    IGSR (A15-12) - E1 (A14-1) R - W-B Headlight swivel ECU RH Ignition switch OFF Below 1 V
    IGSR (A15-12) - E1 (A14-1) R - W-B Headlight swivel ECU RH Ignition switch ON 10 to 14 V
    LR1+ (A15-13) - E1 (A14-1) B - W-B Headlight leveling actuator RH Ignition switch OFF Below 1 V
    LR1+ (A15-13) - E1 (A14-1) B - W-B Headlight leveling actuator RH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    LR1- (A15-14) - E1 (A14-1) LG - W-B Headlight leveling actuator RH Ignition switch OFF Below 1 V
    LR1- (A15-14) - E1 (A14-1) LG - W-B Headlight leveling actuator RH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    LR2+ (A15-15) - E1 (A14-1) V - W-B Headlight leveling actuator RH Ignition switch OFF Below 1 V
    LR2+ (A15-15) - E1 (A14-1) V - W-B Headlight leveling actuator RH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    LR2- (A15-16) - E1 (A14-1) W - W-B Headlight leveling actuator RH Ignition switch OFF Below 1 V
    LR2- (A15-16) - E1 (A14-1) W - W-B Headlight leveling actuator RH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    SBLL (A15-25) - SBGL (A15-26) P-BR Headlight swivel ECU LH Ignition switch OFF Below 1 V
    SBLL (A15-25) - SBGL (A15-26) P-BR Headlight swivel ECU LH Ignition switch ON Signal waveform
    IGSL (A15-28) - E1 (A14-1) Y - W-B Headlight swivel ECU LH Ignition switch OFF Below 1 V
    IGSL (A15-28) - E1 (A14-1) Y - W-B Headlight swivel ECU LH Ignition switch ON 10 to 14 V
    LL1+ (A15-29) - E1 (A14-1) W - W-B Headlight leveling actuator LH Ignition switch OFF Below 1 V
    LL1+ (A15-29) - E1 (A14-1) W - W-B Headlight leveling actuator LH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    LL1- (A15-30) - E1 (A14-1) O - W-B Headlight leveling actuator LH Ignition switch OFF Below 1 V
    LL1- (A15-30) - E1 (A14-1) O - W-B Headlight leveling actuator LH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    LL2+ (A15-31) - E1 (A14-1) GR - W-B Headlight leveling actuator LH Ignition switch OFF Below 1 V
    LL2+ (A15-31) - E1 (A14-1) GR - W-B Headlight leveling actuator LH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    LL2- (A15-32) - E1 (A14-1) B - W-B Headlight leveling actuator LH Ignition switch OFF Below 1 V
    LL2- (A15-32) - E1 (A14-1) B - W-B Headlight leveling actuator LH Engine running, light control switch in HEAD, vehicle stationary and bounced Pulse generation (*2)
    ESR (A15-11) - Body ground GR - Body ground Headlight swivel ECU RH earth circuit Always Below 1 V
    ESL (A15-27) - Body ground GR - Body ground Headlight swivel ECU LH earth circuit Always Below 1 V
    1. *1: Oscilloscope wave

      HINT:

      • Terminal: SPDL-GND, SPDR-GND
      • Gauge set: 5 V/DIV. 2 ms/DIV
      • Condition: Drive at about 30 km/h (19 mph)
      Fig 7: Identifying Waveform 1
      G05273733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. *2: Oscilloscope wave

      HINT:

      • Terminal: LR1+. LR1-. LR2+. LH2- - GND LL1+. LL1-. LL2+. LL2- - GND
      • Gauge set: 5 V/DIV. 10 ms / DIV
      • Condition: The DRL system is on with the engine running or the light control switch is in the HEAD position when the vehicle is stationary or being bounced.

        If the value is not within the standard range, some defects on the vehicle side are possible. Inspect the fuse, wire harness and connector.

        Fig 8: Identifying Waveform 2
        G05273734Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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