DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Smart Key System (For Start, Except HV) - Diagnostics - Introduction (2 Of 2) >> SMART KEY SYSTEM (for Start Function, Gasoline Model) >> Terminals Of Ecu [12/2019 - 10/2021] >> Terminals Of Ecu [12/2019 - 10/2021]

Terminals Of Ecu [12/2019 - 10/2021]

  1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    GTY866401Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A19, M5 and H48 certification ECU (smart key ECU assembly) connectors.
    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 Input / Output Terminal Description Condition Specified Condition Related Data List Item/DTC
      A19-16 (NE) - Body ground Input Engine speed signal Always 10 kΩ or higher Engine Condition
      M5-25 (STP1) - Body ground Input Stop light switch signal Brake pedal depressed → Brake pedal released 9 V or higher → 1 V or less Stop Light Switch1
      H48-4 (+B) - H48-18 (E) Input Power source Always 11 to 14 V -
      H48-22 (P) - H48-18 (E) Input P position signal Shift lever in P → Shift lever not in P 30 kΩ or higher → Below 200 Ω Shift P Signal
      H48-15 (CUTB) - Body ground Input Dark current cut pin* Always 11 to 14 V -
      H48-18 (E) - Body ground - GND Always Below 1 Ω -
      H48-21 (SSW2) - Body ground Input SSW2 contact signal
      HINT: 
      Backup for SSW1. Behaves the same way as SSW1.      		 Engine switch pushed → Engine switch not pushed Below 15 Ω → 10 kΩ or higher Start Switch2
      H48-23 (SSW1) - Body ground Input SSW1 contact signal Engine switch pushed → Engine switch not pushed Below 15 Ω → 10 kΩ or higher Start Switch1
      H48-19 (SPD) - Body ground Input Vehicle speed signal Always 30 kΩ or higher Vehicle Speed Signal
      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 A19, M5 and H48 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 Input / Output Terminal Description Condition Specified Condition Related Data List Item/DTC
      A19-20 (STA) - H48-18 (E) Input When starting the engine, this monitors the voltage sent from terminal STAR to the starter relay to judge whether the engine is "being started". Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off) 6 V or higher*2 → 1.0 V or less -
      A19-9 (STAR) - H48-18 (E) Input / Output Outputs voltage to the starter relay
      • Outputs voltage (12 V) to the starter relay when starting the engine. (Max. 30 sec. Turns off when an engine speed of 1000 rpm.)

      HINT: 
      When Hi is selected, a start request signal (STAR) will not be output even though a start request signal (STSW) is input.      		 Engine switch pressed and held with brake pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off) 6 V or higher*2 → 1.0 V or less -
      Receives neutral start switch (P, N position detection) signal
      • Monitors whether the neutral start switch is on (P or N) or off (other than P or N). Applies voltage via a resistor (large) in the certification ECU (smart key ECU assembly). When the neutral start switch is on, due to the starter relay coil resistance (small) using some of the voltage, the voltage at terminal STAR will be low (2.7 V or less), and when the neutral start switch is off, the voltage will be high (9 V or more).
      		 Perform the following operations except while the engine is cranking:
      • Shift lever in any position other than P or N → Shift lever in P or N (at 20°C (68°F))
      		 9 V or higher → 2.7 V or less Neutral SW/ Clutch SW
      A19-16 (NE) - H48-18 (E) Input Engine speed signal Idling (engine warmed up) Pulse generation
      (See waveform 1)      		 Engine Condition
      M5-25 (STP1) - H48-18 (E) Input Stop light switch signal Brake pedal released → Brake pedal depressed 1 V or less → 9 V or higher Stop Light Switch1
      H48-14 (SLP) - H48-18 (E) Input Steering lock position signal Steering locked → Steering unlocked 11 to 14 V → 1.5 V or less Steering Unlock Switch
      H48-25 (SLR+) - H48-18 (E) Output Steering lock motor operation command signal
      (Steering lock motor operation permission signal sent from the certification ECU (smart key ECU assembly))      		 When a door is opened, the steering lock motor will be operated if all of the following conditions are met:
      • The steering is unlocked.
      • The ignition switch is off.
      • The shift lever is in P.
      		 Pulse generation
      (See waveform 2)      		 -
      H48-13 (LIN) - H48-18 (E) Input / Output LIN communication line Ignition switch ON Pulse generation Steering Lock Start Cond
      H48-22 (P) - H48-18 (E) Input P position signal Shift lever in P → Shift lever not in P 9 V or higher → 2.76 V or less Shift P Signal
      H48-21 (SSW2) - H48-18 (E) Input SSW2 contact signal
      HINT: 
      Backup for SSW1. Behaves the same way as SSW1.      		 Engine switch not pushed → Engine switch pushed 9 V or higher → 1 V or less Start Switch2
      H48-23 (SSW1) - H48-18 (E) Input SSW1 contact signal Engine switch not pushed → Engine switch pushed 9 V or higher → 1 V or less Start Switch1
      H48-16 (ACCD) - H48-18 (E) Output ACC signal Ignition switch off → Ignition switch ACC 1 V or less → 8.5 V or higher ACC Relay Monitor
      H48-17 (IG1D) - H48-18 (E) Output IG signal Ignition switch ACC → Ignition switch ON 1 V or less → 9 V or higher IG Relay Monitor (Outside)
      H48-19 (SPD) - H48-18 (E) Input Vehicle speed signal Vehicle being driven at approx. 5 km/h (3 mph) Pulse generation
      (See waveform 3)      		 Vehicle Speed Signal
      H48-8 (CLG5) - H48-18 (E) Output 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 4)      		 -
      H48-9 (CG5B) - H48-18 (E) Output 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 4)      		 -
      M5-5 (CLG6) - H48-18 (E) Output 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 4)      		 -
      M5-6 (CG6B) - H48-18 (E) Output 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 4)      		 -
      M5-11 (CLG7) - H48-18 (E) Output Output to No. 3 indoor electrical key antenna assembly (inside luggage compartment) 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 4)      		 -
      M5-10 (CG7B) - H48-18 (E) Output Output to No. 3 indoor electrical key antenna assembly (inside luggage compartment) (terminal on opposite side of component from CLG7 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 4)      		 -
      H48-5 (TXCT) - H48-11 (AGND) Output Signal output to transponder key amplifier Ignition switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed Below 1 V
      • BCC Malfunction
      • Abnormal Status
      • Different Encrypt Code
      • Different Serial Number
      • Frame Error
      • Response
      H48-6 (CODE) - H48-11 (AGND) Input Signal input from transponder key amplifier Ignition switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed Below 1 V
      H48-7 (VC5) - H48-11 (AGND) Output Transponder key amplifier power supply Ignition switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed Below 1 V
      H48-11 (AGND) - Body ground - Transponder key amplifier ground Always Below 1 Ω
      H48-5 (TXCT) - H48-11 (AGND) Output Signal output to transponder key amplifier
      (Code sent from certification ECU (smart key ECU assembly) to transponder key amplifier built into engine switch, and then transmitted by transponder key amplifier antenna as radio waves)      		 Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed Pulse generation
      (See waveform 5)
      • BCC Malfunction
      • Abnormal Status
      • Different Encrypt Code
      • Different Serial Number
      • Frame Error
      • Response
      H48-6 (CODE) - H48-11 (AGND) Input Signal input from transponder key amplifier
      (Radio waves from transponder key amplifier built into engine switch used to detect key information. Key information then sent to certification ECU (smart key ECU assembly))      		 Ignition switch off, engine switch pressed with electrical key transmitter sub-assembly held near engine switch
      HINT: 
      Remove the transmitter battery before performing this inspection.      		 Pulse generation
      (See waveform 6)
      H48-7 (VC5) - H48-11 (AGND) Output Transponder key amplifier power supply
      (Power supplied from certification ECU (smart key ECU assembly) when transponder key amplifier built into engine switch activated)      		 Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed Pulse generation
      (See waveform 7)
      A19-3 (EFII) - H48-18 (E) Input EFI communication input
      (Signal input from ECM to certification ECU (smart key ECU assembly))      		 Ignition switch off 11 to 14 V
      • B2799-86
      • B279A-12
      • EFI Code Receive
      • Engine Start Request
      A19-4 (EFIO) - H48-18 (E) Output EFI communication output
      (Signal output from certification ECU (smart key ECU assembly) to ECM)      		 Ignition switch off 11 to 14 V → 1 V or less
      A19-3 (EFII) - H48-18 (E) Input EFI communication input
      (Signal input from ECM to certification ECU (smart key ECU assembly))      		 Within 3 seconds of engine start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery Pulse generation
      (See waveform 8)
      A19-4 (EFIO) - H48-18 (E) Output EFI communication output
      (Signal output from certification ECU (smart key ECU assembly) to ECM)      		 Ignition switch turned to ON using registered electrical key transmitter sub-assembly Pulse generation
      (See waveform 9)
      H48-20 (IND) - H48-18 (E) Output Security indicator output Ignition switch off → ON Pulse generation → Below 2 V -
      M5-7 (WCSW) - H48-18 (E)*1 Output Wireless charger system stop signal Procedure:
      1. Ignition switch off
      2. Electrical key transmitter sub-assembly inside vehicle
      3. Ignition switch off → ACC
      		 Below 1 V → 4.5 to 6 V
      (For 1 second after ignition switch ACC)      		 -
      1. *1: w/ Wireless Charging System

      HINT: 

      • *2: While the engine is cranking, the auxiliary battery voltage may drop to approximately 6 V.
      • The waveform of the steering lock actuator motor stopped can be checked without performing any particular operation.
      • The waveform of the steering lock actuator motor operating can be checked if either of the following operations is performed:
        • To unlock the steering, bring the electrical key transmitter sub-assembly into the cabin and turn the ignition switch to ACC or ON.
        • To lock the steering, open a door with the ignition switch off and the shift lever in P.
    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
        GTY772721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection A19-16 (NE) - H48-18 (E)
        Tool Setting 2 V/DIV., 2 ms./DIV.
        Condition Idling (engine warmed up)

        HINT: 

        The wavelength becomes shorter as the engine speed increases.

      2. Waveform 2
        GTY752532Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Steering lock motor not operating
        *b Steering lock motor operating
        MEASUREMENT CONDITION

        Item Content
        Tester Connection H48-25 (SLR+) - H48-18(E)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Condition When a door is opened, the steering lock motor will be operated if all of the following conditions are met:
        • The steering is unlocked.
        • The ignition switch is off.
        • The shift lever is in P.
      3. Waveform 3
        GTY762053Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection H48-19 (SPD) - H48-18(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.

      4. Waveform 4
        GTY426276Courtesy 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 H48-8 (CLG5) - H48-18 (E)
        H48-9 (CG5B) - H48-18 (E)
        M5-5 (CLG6) - H48-18 (E)
        M5-6 (CG6B) - H48-18 (E)
        M5-11 (CLG7) - H48-18 (E)
        M5-10 (CG7B) - H48-18 (E)
        Tool Setting 2 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
      5. Waveform 5
        GTY429542Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection H48-5 (TXCT) - H48-11 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed
      6. Waveform 6
        GTY510289Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Waveform
        *b Waveform (detail)
        MEASUREMENT CONDITION

        Item Content
        Tester Connection H48-6 (CODE) - H48-11 (AGND)
        Tool Setting
        • Waveform

          1 V/DIV., 20 ms./DIV.

        • Waveform (detail)

          2 V/DIV., 100 μs./DIV.
        Condition Ignition switch off, engine switch pressed with electrical key transmitter sub-assembly held near engine switch*

        HINT: 

        *: Remove the transmitter battery before performing this inspection.

      7. Waveform 7
        GTY426469Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection H48-7 (VC5) - H48-11 (AGND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Condition Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed
      8. Waveform 8
        GTY367336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Approximately 160 ms. *b Approximately 270 ms.
        MEASUREMENT CONDITION

        Item Content
        Tester Connection A19-3 (EFII) - H48-18 (E)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of engine start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery
      9. Waveform 9
        GTY384373Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Approximately 160 ms. *b Approximately 270 ms.
        MEASUREMENT CONDITION

        Item Content
        Tester Connection A19-4 (EFIO) - H48-18 (E)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Ignition switch turned to ON using registered electrical key transmitter sub-assembly
  2. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) 
    GTY916350Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the H52 steering lock ECU (steering lock actuator or upper bracket assembly) 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.

      Terminal No. (Symbol) Input / Output Terminal Description Condition Specified Condition Related Data List Item/DTC
      H52-1 (GND) - Body ground - Ground Always Below 1 Ω -
      H52-6 (IG2) - H52-1 (GND) Input IG signal (IG2 power supply input for steering lock motor) Ignition switch off Below 1 V -
      Ignition switch ON 11 to 14 V
      H52-7 (B) - Body ground Input Constant power supply Always 11 to 14 V -
    3. Connect the H52 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
    4. Measure the voltage, and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Input / Output Terminal Description Condition Specified Condition Related Data List Item/DTC
      H52-3 (IGE) - H52-1 (GND) Input Steering lock motor operation permission signal (motor operation permission signal supplied by certification ECU (smart key ECU assembly)) Steering lock motor operating when all conditions met, and then door opened:
      • Shift lever in P
      • Steering unlocked
      • Ignition switch turned off
      		 Pulse generation
      (See waveform 1)
      • Power Supply Short
      • Unlock Request Receive
      • Lock Request Receive
      H52-4 (SLP1) - H52-1 (GND) Output Steering lock bar position signal (signal output from steering unlock sensor) Steering locked → unlocked 11 to 14 V → Below 1.5 V Sensor Value
      H52-5 (LIN) - H52-1 (GND) Input / Output LIN communication line Ignition switch ON Pulse generation Steering Lock Start Cond

      HINT: 

      • There is 1 motor and 2 sensors built into the steering lock actuator or upper bracket assembly.
      • When taking measurements when the lock motor is stopped, it is not necessary to perform any operations.
      • In order to take measurements when the lock motor is operating, perform either of the following operations:
        • To unlock the steering, carry the key and turn the ignition switch to ACC or ON.
        • To lock the steering, turn the ignition switch off with the shift lever in P, and then open a door.
    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 (Reference)
        GTY367544Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Steering lock motor not operating
        *b Steering lock motor operating
        MEASUREMENT CONDITION

        Item Content
        Tester Connection H52-3 (IGE) - H52-1 (GND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Condition Steering lock motor operating when all conditions met, and then door opened:
        • Shift lever in P
        • Steering unlocked
        • Ignition switch turned off
  3. CHECK ECM 
    GTY935008Courtesy 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) Input / Output Terminal Description Condition Specified Condition Related Data List Item/DTC
      A28-3 (+B2) - C54-53 (E1) Input Ignition power supply Ignition switch ON 11 to 14 V -
      A28-2 (+B) - C54-53 (E1) Input Ignition power supply Ignition switch ON 11 to 14 V -
      A28-46 (MREL) - C54-53 (E1) Input Ignition power supply Ignition switch ON 11 to 14 V -
      A28-1 (BATT) - C54-53 (E1) Input +B power supply Always 11 to 14 V -
      C54-53 (E1) - Body ground - Ground Always Below 1 Ω -
      A28-45 (IMO) - C54-53 (E1) Output Certification ECU (smart key ECU assembly) communication output Ignition switch off 11 to 14 V -
      A28-45 (IMO) - C54-53 (E1) Output Certification ECU (smart key ECU assembly) communication output Within 3 seconds of engine start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery Pulse generation
      (See waveform 1)      		 -
      A28-59 (IMI) - C54-53 (E1) Input Certification ECU (smart key ECU assembly) communication input Ignition switch off 11 to 14 V → 1 V or less -
      A28-59 (IMI) - C54-53 (E1) Input Certification ECU (smart key ECU assembly) communication input Ignition switch turned to ON using registered electrical key transmitter sub-assembly Pulse generation
      (See waveform 2)      		 -
    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 A28-45 (IMO) - C54-53 (E1)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Within 3 seconds of engine 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 A28-59 (IMI) - C54-53 (E1)
        Tool Setting 2 V/DIV., 500 ms./DIV.
        Condition Ignition switch turned to ON using registered electrical key transmitter sub-assembly
  4. CHECK ENGINE SWITCH 
    GTY914895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Input / Output Terminal Description Condition Specified Condition Related Data List Item/DTC
      H49-6 (AGND) - Body ground - Transponder key amplifier ground Always Below 1 Ω -
      H49-7 (TXCT) - H49-6 (AGND) Input Immobiliser communication input Ignition switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed Below 1 V -
      H49-8 (CODE) - H49-6 (AGND) Output Immobiliser communication output Ignition switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed Below 1 V -
      H49-10 (VC5) - H49-6 (AGND) Input Transponder key amplifier power supply Ignition switch off, brake pedal not depressed, 30 seconds or more after driver door opened and then closed Below 1 V -
    2. Check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Input / Output Terminal Description Condition Specified Condition Related Data List Item/DTC
      H49-7 (TXCT) - H49-6 (AGND) Input Signal input from certification ECU (smart key ECU assembly)
      (Code sent from certification ECU (smart key ECU assembly) to transponder key amplifier built into engine switch, and then transmitted by transponder key amplifier antenna as radio waves)      		 Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed Pulse generation
      (See waveform 1)
      • BCC Malfunction
      • Abnormal Status
      • Different Encrypt Code
      • Different Serial Number
      • Frame Error
      • 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
      H49-8 (CODE) - H49-6 (AGND) Output Signal output to certification ECU (smart key ECU assembly)
      (Radio waves from transponder key amplifier built into engine switch used to detect key information. Key information then sent to certification ECU (smart key ECU assembly))      		 Ignition switch off, engine switch pressed with electrical key transmitter sub-assembly held near engine switch* Pulse generation
      (See waveform 2)
      H49-10 (VC5) - H49-6 (AGND) Input Transponder key amplifier power supply
      (Power supplied from certification ECU (smart key ECU assembly) when transponder key amplifier built into engine switch activated)      		 Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed Pulse generation
      (See waveform 3)

      HINT: 

      *: Remove the transmitter battery before performing this inspection.

    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)
        GTY429541Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection H49-7 (TXCT) - H49-6 (AGND)
        Tool Setting 2 V/DIV., 20 ms./DIV.
        Condition Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed
      2. Waveform 2 (Reference)
        GTY510289Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Waveform
        *b Waveform (detail)
        MEASUREMENT CONDITION

        Item Content
        Tester Connection H49-8 (CODE) - H49-6 (AGND)
        Tool Setting
        • Waveform

          1 V/DIV., 20 ms./DIV.

        • Waveform (detail)

          2 V/DIV., 100 μs./DIV.
        Condition Ignition switch off, engine switch pressed with electrical key transmitter sub-assembly held near engine switch*

        HINT: 

        *: Remove the transmitter battery before performing this inspection.

      3. Waveform 3 (Reference)
        GTY426468Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        MEASUREMENT CONDITION

        Item Content
        Tester Connection H49-10 (VC5) - H49-6 (AGND)
        Tool Setting 2 V/DIV., 200 ms./DIV.
        Condition Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed
Diesel-Data.com