Toyota Yaris: Smart Key System (for Start Function) / Terminals Of Ecu

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function) / Terminals Of Ecu

TERMINALS OF ECU

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the H45 and H46 certification ECU (smart key ECU assembly) connectors.

(b) 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

H45-15 (NE) - Body ground

Engine speed signal

Always

10 kΩ or higher

Power Source Control
  • Engine Condition

H46-6 (+B) - H46-29 (E)

Power source

Always

11 to 14 V

-

H45-22 (CUTB) - Body ground

Dark current cut pin*1

Always

11 to 14 V

-

H46-29 (E) - Body ground

GND

Always

Below 1 Ω

-

H46-23 (SSW3) - Body ground

SSW3 contact signal

Engine switch pushed → Engine switch not pushed

Below 15 Ω → 10 kΩ or higher

Power Source Control
  • Push Start Switch 3

H46-27 (SSW2) - Body ground

SSW2 contact signal

Engine switch pushed → Engine switch not pushed

Below 15 Ω → 10 kΩ or higher

Power Source Control
  • Push Start Switch 2

H46-19 (SSW1) - Body ground

SSW1 contact signal

Engine switch pushed → Engine switch not pushed

Below 15 Ω → 10 kΩ or higher

Power Source Control
  • Push Start Switch 1

H45-13 (SPD) - Body ground

Vehicle speed signal

Always

30 kΩ or higher

Power Source Control
  • Vehicle Running Condition (Line)
  • *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).

(c) Connect the H45 and H46 certification ECU (smart key ECU assembly) connectors.

(d) 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

H45-3 (STA) - H46-29 (E)

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 clutch pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off)

6 V → 1.0 V or less

-

H45-10 (STAR) - H46-29 (E)

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 clutch pedal depressed (starter on) → Approximately 1 second after engine switch released (starter off)

6 V → 1.0 V or less

-

H45-15 (NE) - Body ground

Engine speed signal

Idling (engine warmed up)

Pulse generation

(See waveform 5)

Power Source Control
  • Engine Condition

H46-11 (SLP) - H46-29 (E)

Steering lock position signal

Steering locked → Steering unlocked

11 to 14 V → 1.5 V or less

Power Source Control
  • Steering Unlock Switch

H46-24 (SLR+) - H46-29 (E)

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.

Pulse generation

(See waveform 1)

-

H46-8 (LIN) - H46-29 (E)

LIN communication line

Ignition switch ON

Pulse generation

Smart Key
  • Steering Lock Start Condition

H46-23 (SSW3) - H46-29 (E)

SSW3 contact signal

Engine switch not pushed → Engine switch pushed

9 V or higher → 1 V or less

Power Source Control
  • Push Start Switch 3

H46-27 (SSW2) - H46-29 (E)

SSW2 contact signal

Engine switch not pushed → Engine switch pushed

9 V or higher → 1 V or less

Power Source Control
  • Push Start Switch 2

H46-19 (SSW1) - H46-29 (E)

SSW1 contact signal

Engine switch not pushed → Engine switch pushed

9 V or higher → 1 V or less

Power Source Control
  • Push Start Switch 1

H46-21 (ACCD) - H46-29 (E)

ACC signal

Ignition switch off → Ignition switch ACC

1 V or less → 8.5 V or higher

Power Source Control
  • ACC Relay Monitor

H45-11 (IGRD) - H46-29 (E)

IG signal

Ignition switch off → Ignition switch ON

1 V or less → 9 V or higher

Power Source Control
  • IGR Relay Circuit (Outside) Monitor

H45-24 (IGPD) - H46-29 (E)

IG signal

Ignition switch off → Ignition switch ON

1 V or less → 9 V or higher

Power Source Control
  • IGP Relay Circuit (Outside) Monitor

H45-13 (SPD) - H46-29 (E)

Vehicle speed signal

Vehicle being driven at approx. 5 km/h (3 mph)

Pulse generation

(See waveform 2)

Power Source Control
  • Vehicle Running Condition (Line)

H46-4 (CLG5) - H46-29 (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 3)

-

H46-5 (CG5B) - H46-29 (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 3)

-

O47-10 (CLG7) - H46-29 (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)

-

O47-9 (CG7B) - H46-29 (E)

Output to No. 2 indoor electrical key antenna assembly (rear floor) (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 3)

-

H46-30 (AGND) - Body ground

Transponder key amplifier ground

Always

Below 1 Ω

-

H46-12 (ANT1) - H46-30 (AGND)

Signal input / output from transponder key coil (transponder key coil built into engine switch)

Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed

Pulse generation

(See waveform 4)

Smart Key
  • Encrypt Code Difference

H46-13 (ANT2) - H46-30 (AGND)

Signal input / output from transponder key coil (transponder key coil built into engine switch)

Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed

Pulse generation

(See waveform 4)

H46-25 (IND) - H46-29 (E)

Security indicator output

Ignition switch off → ON

Pulse generation → Below 2 V

-

HINT:

  • 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.
  • *1: While the engine is cranking, the auxiliary battery voltage may drop to approximately 6 V.

(e) Using an oscilloscope, check the waveform of the ECU.

NOTICE:

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

(1) Waveform 1

*a

Steering lock motor not operating

*b

Steering lock motor operating

Measurement Condition

Item

Content

Tester Connection

H46-24 (SLR+) - H46-29 (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.

(2) Waveform 2

Measurement Condition

Item

Content

Tester Connection

H45-13 (SPD) - H46-29 (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.

(3) Waveform 3

*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

H46-4 (CLG5) - H46-29 (E)

H46-5 (CG5B) - H46-29 (E)

O47-10 (CLG7) - H46-29 (E)

O47-9 (CG7B) - H46-29 (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

Measurement Condition

Item

Content

Tester Connection

H46-12 (ANT1) - H46-30 (AGND)

H46-13 (ANT2) - H46-30 (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 engine switch pressed

(5) Waveform 5

Measurement Condition

Item

Content

Tester Connection

H45-15 (NE) - Body ground

Tool Setting

2 V/DIV., 2 ms./DIV.

Condition

Idling (engine warmed up)

HINT:

The wavelength becomes shorter as the engine speed increases.

CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

(a) Disconnect the H71 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

(b) 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)

Terminal Description

Condition

Specified Condition

Related Data List Item/DTC

H71-1 (GND) - Body ground

Ground

Always

Below 1 Ω

-

H71-7 (B) - Body ground

Constant power supply

Ignition switch off

11 to 14 V

-

(c) Connect the H71 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

(d) 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

H71-3 (IGE) - H71-1 (GND)

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:

  • Steering unlocked
  • Ignition switch turned off

Pulse generation

(See waveform 1)

Smart Key
  • Power Supply Short History
  • Unlock Request Receive
  • Steering Lock Request Receive

H71-4 (SLP1) - H71-1 (GND)

Steering lock bar position signal (signal output from steering unlock sensor)

Steering locked → unlocked

11 to 14 V → Below 1.5 V

Smart Key
  • Sensor Malfunction History

H71-5 (LIN) - H71-1 (GND)

LIN communication line

Ignition switch ON

Pulse generation

Smart Key
  • Steering Lock Start Condition

H71-6 (SLA) - H71-1 (GND)

Steering lock motor operation permission signal (motor operation permission signal supplied by certification ECU (smart key ECU assembly))

Ignition switch off → ON

Below 1 V → 11 to 14 V

-

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 and then open a door.

(e) Using an oscilloscope, check the waveform of the ECU.

NOTICE:

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

Waveform 1

*a

Steering lock motor not operating

*b

Steering lock motor operating

Measurement Condition

Item

Content

Tester Connection

H71-3 (IGE) - H71-1 (GND)

Tool Setting

2 V/DIV., 200 ms./DIV.

Condition

Steering lock motor operating when all conditions met, and then door opened:

  • Steering unlocked
  • Ignition switch turned off

CHECK ID CODE BOX (IMMOBILISER CODE ECU)

(a) Disconnect the H67 ID code box (immobiliser code ECU) connector.

(b) 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

H67-1 (+B) - Body ground

Power source

Ignition switch off

11 to 14 V

-

H67-5 (GND) - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the H67 ID code box (immobiliser code ECU) connector.

(d) 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

H67-3 (EFII) - H67-5 (GND)

EFI communication input

(Signal input from ECM to ID code box (immobiliser code ECU))

Ignition switch off

11 to 14 V

Smart Key

  • EFI Code Receive
  • Start Request

H67-3 (EFII) - H67-5 (GND)

EFI communication input

(Signal input from ECM to ID code box (immobiliser code ECU))

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)

H67-4 (EFIO) - H67-5 (GND)

EFI communication output

(Signal output from ID code box (immobiliser code ECU) to ECM)

Ignition switch off

Below 1 V

H67-4 (EFIO) - H67-5 (GND)

EFI communication output

(Signal output from ID code box (immobiliser code ECU) to ECM)

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 2)

H67-2 (LIN1) - H67-5 (GND)

LIN communication line

Ignition switch ON

Pulse generation

Smart Key

  • Steering Lock Start Cond

(e) Using an oscilloscope, check the waveform.

NOTICE:

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

(1) Waveform 1

*a

Approximately 160 ms.

*b

Approximately 270 ms.

Item

Content

Tester Connection

H67-3 (EFII) - H67-5 (GND)

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

*a

Approximately 160 ms.

*b

Approximately 270 ms.

Item

Content

Tester Connection

H67-4 (EFIO) - H67-5 (GND)

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

CHECK ECM

(a) 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

A106-13 (IGR) - A106-10 (E1)

Ignition power supply

Ignition switch ON

11 to 14 V

-

A106-1 (BATT) - A106-10 (E1)

+B power supply

Always

11 to 14 V

-

A106-10 (E1) - Body ground

Ground

Always

Below 1 Ω

-

A106-47 (IMO) - A106-10 (E1)

EFI communication input

(Signal input from ECM to ID code box (immobiliser code ECU))

Ignition switch off

11 to 14 V

Smart Key
  • EFI Code Receive
  • Engine Start Request

EFI communication input

(Signal input from ECM to ID code box (immobiliser code ECU))

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)

A106-61 (IMI) - A106-10 (E1)

EFI communication input

(Signal output from ID code box (immobiliser code ECU) to ECM)

Ignition switch off

1 V or less

EFI communication input

(Signal output from ID code box (immobiliser code ECU) to ECM)

Ignition switch turned to ON using registered electrical key transmitter sub-assembly

Pulse generation

(See waveform 2)

A106-16 (NEO) - A106-10 (E1)

Engine speed signal

Idling (engine warmed up)

Pulse generation

(See waveform 3)

Power Source Control
  • Engine Condition

A106-30 (STA) - A106-10 (E1)

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 is cranking

6 V or higher

-

A106-23 (NSW) - A106-10 (E1)

Clutch start switch signal

Ignition switch ON (Clutch pedal fully depressed)

Below 1.5 V

-

Ignition switch ON (Clutch pedal released)

11 to 14 V

-

(b) Using an oscilloscope, check the waveform.

NOTICE:

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

(1) Waveform 1 (Reference)

*a

Approximately 160 ms.

*b

Approximately 270 ms.

Measurement Condition

Item

Content

Tester Connection

A106-47 (IMO) - A106-10 (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)

*a

Approximately 160 ms.

*b

Approximately 270 ms.

Measurement Condition

Item

Content

Tester Connection

A106-61 (IMI) - A106-10 (E1)

Tool Setting

2 V/DIV., 500 ms./DIV.

Condition

Ignition switch turned to ON using registered electrical key transmitter sub-assembly

(3) Waveform 3

Measurement Condition

Item

Content

Tester Connection

A106-16 (NEO) - A106-10 (E1)

Tool Setting

5 V/DI., 20 ms./DIV.

Condition

Idling (engine warmed up)

HINT:

The wavelength becomes shorter as the engine speed increases.

CHECK ENGINE SWITCH

(a) 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

H68-3 (GND) - Body ground

Transponder key amplifier ground

Always

Below 1 Ω

-

H68-11 (SS3) - H68-3 (GND)

SS3 contact signal

HINT:

Backup for SS1. Behaves the same way as SS1.

Engine switch not pushed → Engine switch pushed

9 V or higher → Below 1 V

Power Source Control
  • Start Switch 3

H68-6 (SS2) - H68-3 (GND)

SS2 contact signal

HINT:

Backup for SS1. Behaves the same way as SS1.

Engine switch not pushed → Engine switch pushed

9 V or higher → Below 1 V

Power Source Control
  • Start Switch 2

H68-12 (SS1) - H68-3 (GND)

SS1 contact signal

Engine switch not pushed → Engine switch pushed

9 V or higher → Below 1 V

Power Source Control
  • Start Switch 1

(b) 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

H68-1 (ANT1) - H68-3 (GND)

Signal input / output from transponder key coil (transponder key coil built into engine switch)

Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed

Pulse generation

(See waveform 1)

Smart Key
  • Encrypt Code Difference

    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

H68-7 (ANT2) - H68-3 (GND)

Signal input / output from transponder key coil (transponder key coil built into engine switch)

Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed

Pulse generation

(See waveform 1)

(c) Using an oscilloscope, check the waveform.

NOTICE:

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

(1) Waveform 1 (Reference)

Measurement Condition

Item

Content

Tester Connection

H68-1 (ANT1) - H68-3 (GND)

H68-7 (ANT2) - H68-3 (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 engine switch pressed

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