LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2021 >> LS 500h AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Smart Access System (For Start, W/O Front Lidar Sensor) - Diagnostics - Introduction) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, without Front LiDAR Sensor) >> Terminals Of Ecu [10/2023 - ] >> Terminals Of Ecu [10/2023 - ]
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Terminals Of Ecu [10/2023 - ]

WARNING: This page is about a different car, the 2024 Lexus LS 500h. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • When performing an inspection, make sure that "ACC Customize" is set to "ON" using the multi-display.

    Refer to CUSTOMIZE PARAMETERS [10/2023 - ] 

  • When "ACC Customize" is set to "ON" (ACC supply power enabled), the certification ECU (smart key ECU assembly) controls the ACC relay on and off. When "ACC Customize" is set to "OFF" (ACC supply power disabled), the certification ECU (smart key ECU assembly) and radio and display receiver assembly control the ACC relay on and off.

    Therefore, inspection conditions and results may differ depending on whether "ACC customize" is set to ON or OFF when inspecting ACC related terminals.

  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    GTY1240533Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A124 and G212 certification ECU (smart key ECU assembly) connectors.
    2. Measure the resistance and voltage according to the value(s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

      Tester Connection Terminal Description Condition Specified Condition Related Data List Item/DTC
      A124-21 (STP1) - Body ground Stop light switch signal Brake pedal depressed → Brake pedal released 9 V or higher → 1 V or less Power Source Control 
      1. Stop Light Switch
      G212-6 (+B) - G212-29 (E) Power source Ignition switch off 11 to 14 V -
      G212-14 (P) - G212-29 (E) P position signal Always 30 kΩ or higher Power Source Control 
      1. Shift P Signal Condition (Line)
      A124-22 (CUTB) - Body ground Dark current cut pin* Ignition switch off 11 to 14 V -
      G212-29 (E) - Body ground GND Always Below 1 Ω -
      G212-11 (SLP) - G212-29 (E) GND Always Below 1 Ω -
      G212-23 (SSW3) - Body ground SSW3 contact signal Power switch pushed → Power switch not pushed Below 15 Ω → 10 kΩ or higher Power Source Control 
      1. Push Start Switch 3
      G212-27 (SSW2) - Body ground SSW2 contact signal Power switch pushed → Power switch not pushed Below 15 Ω → 10 kΩ or higher Power Source Control 
      1. Push Start Switch 2
      G212-19 (SSW1) - Body ground SSW1 contact signal Power switch pushed → Power switch not pushed Below 15 Ω → 10 kΩ or higher Power Source Control 
      1. Push Start Switch 1
      1. *: In order to prevent the vehicle auxiliary battery from being depleted when the vehicle is shipped long distances, a fuse that cuts unnecessary electrical load while the vehicle is being shipped is installed in the circuit. If the fuse is removed, the circuit becomes open. If the fuse that is between the vehicle auxiliary battery and terminal CUTB is removed and the circuit is open, the certification ECU (smart key ECU assembly) changes to a certain control mode (example: the transmission of radio waves every 0.25 seconds, which form the detection area, stops).
    3. Connect the A124 and G212 certification ECU (smart key ECU assembly) connectors.
    4. Measure the voltage and resistance, and check for pulses according to the value(s) in the table below.
      Tester Connection Terminal Description Condition Specified Condition Related Data List Item/DTC
      G212-8 (LIN) - G212-29 (E) LIN communication line Ignition switch ON Pulse generation -
      G212-14 (P) - G212-29 (E) P position signal Ignition switch ON and Shift position in P Pulse generation (24 to 25 Hz or 30 to 31 Hz, High voltage: 9 V or more, Low voltage: below 1 V, duty ratio: 10 %) Power Source Control 
      1. Shift P Signal Condition (Line)
      Ignition switch ON and Shift position in other then P or N Pulse generation (24 to 25 Hz or 30 to 31 Hz, High voltage: 9 V or more, Low voltage: below 1 V, duty ratio: 70 %)
      G212-23 (SSW3) - G212-29 (E) SSW3 contact signal Power switch not pushed → Power switch pushed 9 V or higher → 1 V or less Power Source Control 
      1. Push Start Switch 3
      G212-27 (SSW2) - G212-29 (E) SSW2 contact signal Power switch not pushed → Power switch pushed 9 V or higher → 1 V or less Power Source Control 
      1. Push Start Switch 2
      G212-19 (SSW1) - G212-29 (E) SSW1 contact signal Power switch not pushed → Power switch pushed 9 V or higher → 1 V or less Power Source Control 
      1. Push Start Switch 1
      G212-21 (ACCD) - G212-29 (E) ACC signal Ignition switch off → Ignition switch ACC 1 V or less → 8.5 V or higher Power Source Control 
      1. ACC Relay Monitor
      A124-11 (IGRD) - G212-29 (E) IG signal Ignition switch off → Ignition switch ON 1 V or less → 9 V or higher Power Source Control 
      1. IGR Relay Circuit (Outside) Monitor
      A124-24 (IGPD) - G212-29 (E) IG signal Ignition switch off → Ignition switch ON 1 V or less → 9 V or higher Power Source Control 
      1. IGP Relay Circuit (Outside) Monitor
      A124-13 (SPD) - G212-29 (E) Vehicle speed signal Vehicle being driven at approx. 5 km/h (3 mph) Pulse generation
      (See waveform 1)      		 Power Source Control 
      1. Vehicle Running Condition (Line)
      A124-2 (ST2) - G212-29 (E) STSW signal With the brake pedal depressed, the power switch is pressed and held → After approx. 3 sec. has elapsed, the power switch is released 8.5 V or higher → 1 V or less -
      G212-4 (CLG5) - G212-29 (E) Output to No. 1 indoor electrical key antenna assembly (front floor) Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly not inside vehicle
      3. Within 30 seconds of closing any door
      		 Pulse generation
      (See waveform 2)      		 -
      G212-5 (CG5B) - G212-29 (E) Output to No. 1 indoor electrical key antenna assembly (front floor) (terminal on opposite side of component from CLG5 output terminal) Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly not inside vehicle
      3. Within 30 seconds of closing any door
      		 Pulse generation
      (See waveform 2)      		 -
      L285-1 (CLG6) - G212-29 (E) Output to No. 2 indoor electrical key antenna assembly (rear floor) Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly not inside vehicle
      3. Within 30 seconds of closing any door
      		 Pulse generation
      (See waveform 3)      		 -
      L285-2 (CG6B) - G212-29 (E) Output to No. 2 indoor electrical key antenna assembly (rear floor) (terminal on opposite side of component from CLG6 output terminal) Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly not inside vehicle
      3. Within 30 seconds of closing any door
      		 Pulse generation
      (See waveform 2)      		 -
      G212-30 (AGND) - Body ground Transponder key amplifier ground Always Below 1 Ω -
      G212-12 (ANT1) - G212-30 (AGND) Signal input / output from transponder key coil (transponder key coil built into power switch) Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power switch pressed Pulse generation
      (See waveform 4)      		 Smart Access 
      1. Encrypt Code Difference
      G212-13 (ANT2) - G212-30 (AGND) Signal input / output from transponder key coil (transponder key coil built into power switch) Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power switch pressed Pulse generation
      (See waveform 5)
      G212-25 (IND) - G212-29 (E) Security indicator output Ignition switch off → ON Pulse generation → Below 2 V -
      L285-20 (WCSW) - G212-29 (E)* Wireless charger system stop signal Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly inside vehicle
      3. Ignition switch off → ACC or ON
      		 Below 1 V → 4.5 to 6 V
      (For 1 second after ignition switch to ACC or ON)      		 -
      1. *: w/ Wireless Charging System
    5. Using an oscilloscope, check the waveform of the ECU.
      NOTE:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      1. Waveform 1
        GTY762053Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection A124-13 (SPD) - G212-29 (E)
        Tool Setting 5 V/DIV., 20 ms./DIV.
        Condition Vehicle being driven at approx. 5 km/h (3 mph)

        HINT: 

        The wavelength becomes shorter as the vehicle speed increases.

      2. Waveform 2
        GTY1013227Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a For 30 seconds after any door closed
        *b After 30 seconds or more have elapsed since any door closed
        MEASUREMENT CONDITION

        Item Content
        Tester Connection G212-4 (CLG5) - G212-29 (E)
        G212-5 (CG5B) - G212-29 (E)
        L285-2 (CG6B) - G212-29 (E)
        Tool Setting 5 V/DIV., 500 ms/DIV.
        Condition Procedure:
        1. Ignition switch off
        2. Electrical key transmitter sub-assembly not inside vehicle
        3. Within 30 seconds of closing any door
      3. Waveform 3
        GTY1012957Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a For 30 seconds after any door closed
        *b After 30 seconds or more have elapsed since any door closed
        MEASUREMENT CONDITION

        Item Content
        Tester Connection L285-1 (CLG6) - G212-29 (E)
        Tool Setting 5 V/DIV., 500 ms/DIV.
        Condition Procedure:
        1. Ignition switch off
        2. Electrical key transmitter sub-assembly not inside vehicle
        3. Within 30 seconds of closing any door
      4. Waveform 4
        GTY1012023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection G212-12 (ANT1) - G212-30 (AGND)
        Tool Setting 5 V/DIV., 200 ms./DIV.
        Condition Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power switch pressed
      5. Waveform 5
        GTY1012590Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection G212-13 (ANT2) - G212-30 (AGND)
        Tool Setting 20 V/DIV., 200 ms/DIV.
        Condition Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power switch pressed
  2. CHECK ID CODE BOX (IMMOBILISER CODE ECU) 
    GTY1230806Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the G58 ID code box (immobiliser code ECU) connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

      Tester Connection Terminal Description Condition Specified Condition Related Data List Item
      G58-1 (+B) - Body ground Power source Ignition switch off 11 to 14 V -
      G58-5 (GND) - Body ground Ground Always Below 1 Ω
    3. Reconnect the G58 ID code box (immobiliser code ECU) connector.
    4. Measure the voltage and check for pulses according to the value(s) in the table below.
      Tester Connection Terminal Description Condition Specified Condition Related Data List Item
      G58-3 (EFII) - G58-5 (GND) EFI communication input
      (Signal input from hybrid vehicle control ECU to ID code box (immobiliser code ECU))      		 Ignition switch off 11 to 14 V Smart Access 
      • EFI Code Receive
      • Start Request
      G58-3 (EFII) - G58-5 (GND) EFI communication input
      (Signal input from hybrid vehicle control ECU to ID code box (immobiliser code ECU))      		 Within 3 seconds of hybrid control system start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery Pulse generation
      (See waveform 1)
      G58-4 (EFIO) - G58-5 (GND) EFI communication output
      (Signal output from ID code box (immobiliser code ECU) to hybrid vehicle control ECU)      		 Ignition switch off Below 1 V
      G58-4 (EFIO) - G58-5 (GND) EFI communication output
      (Signal output from ID code box (immobiliser code ECU) to hybrid vehicle control ECU)      		 Within 3 seconds of hybrid control system start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery Pulse generation
      (See waveform 2)
      G58-2 (LIN1) - G58-5 (GND) LIN communication line Ignition switch ON Pulse generation -
    5. Using an oscilloscope, check the waveform.
      NOTE:

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      1. Waveform 1
        GTY367336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Approximately 160 ms. *b Approximately 270 ms.
        Item Content
        Tester Connection G58-3 (EFII) - G58-5 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of hybrid control system start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery
      2. Waveform 2
        GTY384373Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Approximately 160 ms. *b Approximately 270 ms.
        Item Content
        Tester Connection G58-4 (EFIO) - G58-5 (GND)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of hybrid control system start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery
  3. CHECK HYBRID VEHICLE CONTROL ECU 
    GTY1232845Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance, and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition Related Data List Item/DTC
      G166-26 (IGP) - G166-15 (E1) Ignition power supply Ignition switch ON 11 to 14 V -
      A107-33 (IGR) - G166-15 (E1) Ignition power supply Ignition switch ON 11 to 14 V -
      G166-15 (E1) - Body ground Ground Always Below 1 Ω -
      G166-39 (IMO) - G166-15 (E1) EFI communication output
      (Signal output from hybrid vehicle control ECU to ID code box (immobiliser code ECU))      		 Ignition switch off 11 to 14 V
      • EFI Code Receive
      • Start Request
      G166-39 (IMO) - G166-15 (E1) EFI communication output
      (Signal output from hybrid vehicle control ECU to ID code box (immobiliser code ECU))      		 Within 3 seconds of hybrid control system start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery Pulse generation
      (See waveform 1)
      G166-25 (IMI) - G166-15 (E1) EFI communication input
      (Signal input from ID code box (immobiliser code ECU) to hybrid vehicle control ECU)      		 Ignition switch off 11 to 14 V → 1 V or less
      G166-25 (IMI) - G166-15 (E1) EFI communication input
      (Signal input from ID code box (immobiliser code ECU) to hybrid vehicle control ECU)      		 Within 3 seconds of hybrid control system start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery Pulse generation
      (See waveform 2)
      G166-4 (ST2) - G166-15 (E1) Hybrid control system start request signal With the brake pedal depressed, the power switch is pressed and held → After approx. 3 sec. has elapsed, the power switch is released 8.5 V or higher → 1.0 V or less -
    2. Using an oscilloscope, check the waveform.
      NOTE:

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      1. Waveform 1 (Reference)
        GTY749966Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Approximately 160 ms. *b Approximately 270 ms.
        MEASUREMENT CONDITION

        Item Content
        Tester Connection G166-39 (IMO) - G166-15 (E1)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of hybrid control system start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery
      2. Waveform 2 (Reference)
        GTY384373Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Approximately 160 ms. *b Approximately 270 ms.
        MEASUREMENT CONDITION

        Item Content
        Tester Connection G166-25 (IMI) - G166-15 (E1)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of hybrid control system start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery
  4. CHECK POWER SWITCH 
    GTY1239052Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition Related Data List Item/DTC
      A-3 (GND) - Body ground Transponder key amplifier ground Always Below 1 Ω -
    2. Measure the voltage and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition Related Data List Item/DTC
      A-1 (ANT1) - A-3 (GND) Signal input / output from transponder key coil (transponder key coil built into power switch) Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power switch pressed Pulse generation
      (See waveform 1)      		 Smart Access 
      • BCC Malfunction
      • Abnormal Status
      • Encrypt Code Difference
      • Different Serial Number
      • Frame Error
      • No Response

        HINT: 

        If immobiliser key code verification communication is not performed correctly, the malfunction may be indicated by one or more of the Data List items listed above
      A-7 (ANT2) - A-3 (GND) Signal input / output from transponder key coil (transponder key coil built into power switch) Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power switch pressed Pulse generation
      (See waveform 2)
      A-11 (SS3) - A-3 (GND) SS3 contact signal
      HINT: 
      Backup for SS1. Behaves the same way as SS1.      		 Power switch not pushed → Power switch pushed 9 V or higher → Below 1 V Power Source Control
      • Push Start Switch 3
      A-6 (SS2) - A-3 (GND) SS2 contact signal
      HINT: 
      Backup for SS1. Behaves the same way as SS1.      		 Power switch not pushed → Power switch pushed 9 V or higher → Below 1 V Power Source Control
      • Push Start Switch 2
      A-12 (SS1) - A-3 (GND) SS1 contact signal Power switch not pushed → Power switch pushed 9 V or higher → Below 1 V Power Source Control
      • Push Start Switch 1
    3. Using an oscilloscope, check the waveform.
      NOTE:

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      1. Waveform 1 (Reference)
        GTY1012025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection A-1 (ANT1) - A-3 (GND)
        Tool Setting 5 V/DIV., 200 ms./DIV.
        Condition Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power switch pressed
      2. Waveform 2 (Reference)
        GTY1012593Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection A-7 (ANT2) - A-3 (GND)
        Tool Setting 20 V/DIV., 200 ms./DIV.
        Condition Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power switch pressed
  5. SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) 

    Refer to TERMINALS OF ECU [10/2023 - ] 

scientia non olet · About LEMON Manuals