Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001OEN2
Model Year Start: 2021 Model: Corolla Prod Date Range: [04/2020 - 09/2022]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): TERMINALS OF ECU; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]

TERMINALS OF ECU

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the O61 and I1 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

Wiring Color

Input / Output

Terminal Description

Condition

Specified Condition

Related Data List Item/DTC

O61-24 (STP1) - Body ground

BR - Body ground

Input

Stop light switch signal

Brake pedal depressed → Brake pedal released

9 V or higher → 1 V or less

Stop Light Switch1

I1-3 (+B) - I1-18 (E)

GR - W-B

Input

Power source

Power switch off

11 to 14 V

-

I1-22 (P) - I1-18 (E)

P - W-B

Input

P position signal

Shift lever in P → Shift lever not in P

30 kΩ or higher → Below 200 Ω

Shift P Signal

I1-17 (CUTB) - Body ground

SB - Body ground

Input

Dark current cut pin*

Power switch off

11 to 14 V

-

I1-18 (E) - Body ground

W-B - Body ground

-

GND

Always

Below 1 Ω

-

I1-13 (SSW3) - Body ground

P - Body ground

Input

SSW3 contact signal

Power switch pushed → Power switch not pushed

Below 15 Ω → 10 kΩ or higher

Start Switch3

I1-20 (SSW2) - Body ground

L - Body ground

Input

SSW2 contact signal

Power switch pushed → Power switch not pushed

Below 15 Ω → 10 kΩ or higher

Start Switch2

I1-23 (SSW1) - Body ground

V - Body ground

Input

SSW1 contact signal

Power switch pushed → Power switch not pushed

Below 15 Ω → 10 kΩ or higher

Start Switch1

I1-7 (SPD) - Body ground

BR - Body ground

Input

Vehicle speed signal

Always

30 kΩ or higher

Vehicle Speed Signal
  • *: 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 O61 and I1 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

Wiring Color

Input / Output

Terminal Description

Condition

Specified Condition

Related Data List Item/DTC

I1-12 (SLP) - I1-18 (E)

G - W-B

Input

Steering lock position signal

Steering locked → Steering unlocked

11 to 14 V → 1.5 V or less

Steering Unlock Switch

I1-25 (SLR+) - I1-18 (E)

P - W-B

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 power switch is off.
  • The shift lever is in P.

11 to 14 V → Below 1 V

-

I1-14 (LIN) - I1-18 (E)

V - W-B

Input / Output

LIN communication line

Power switch on (IG)

Pulse generation

Steering Lock Start Cond

I1-4 (IGB) - I1-18 (E)

Y - W-B

Output

IGB signal

Power switch off → Power switch on (IG)

1 V or less → 8.5 V or higher

-

I1-22 (P) - I1-18 (E)

P - W-B

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

I1-13 (SSW3) - I1-18 (E)

P - W-B

Input

SSW3 contact signal

Power switch not pushed → Power switch pushed

9 V or higher → 1 V or less

Start Switch3

I1-20 (SSW2) - I1-18 (E)

L - W-B

Input

SSW2 contact signal

Power switch not pushed → Power switch pushed

9 V or higher → 1 V or less

Start Switch2

I1-23 (SSW1) - I1-18 (E)

V - W-B

Input

SSW1 contact signal

Power switch not pushed → Power switch pushed

9 V or higher → 1 V or less

Start Switch1

I1-16 (ACCD) - I1-18 (E)

V - W-B

Output

ACC signal

Power switch off → Power switch on (ACC)

1 V or less → 8.5 V or higher

ACC Relay Monitor

I1-15 (IG1D) - I1-18 (E)

R - W-B

Output

IG signal

Power switch on (ACC) → Power switch on (IG)

1 V or less → 9 V or higher

IG Relay Monitor (Outside)

I1-7 (SPD) - I1-18 (E)

BR - W-B

Input

Vehicle speed signal

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

Pulse generation

(See waveform 1)

Vehicle Speed Signal

I1-26 (ST2) - I1-18 (E)

V - W-B

Output

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

-

I1-8 (CLG5) - I1-18 (E)

G - W-B

Output

Output to No. 1 indoor electrical key antenna assembly (front floor)

Procedure:

  1. Power switch off
  2. Electrical key transmitter sub-assembly not inside vehicle
  3. Within 30 seconds of closing any door

Pulse generation

(See waveform 2)

-

I1-9 (CG5B) - I1-18 (E)

R - W-B

Output

Output to No. 1 indoor electrical key antenna assembly (front floor) (terminal on opposite side of component from CLG5 output terminal)

Procedure:

  1. Power switch off
  2. Electrical key transmitter sub-assembly not inside vehicle
  3. Within 30 seconds of closing any door

Pulse generation

(See waveform 2)

-

I1-11 (AGND) - Body ground

W - Body ground

-

Transponder key amplifier ground

Always

Below 1 Ω
  • BCC Malfunction
  • Abnormal Status
  • Different Encrypt Code
  • Different Serial Number
  • Frame Error
  • Response

I1-5 (ANT1) - I1-11 (AGND)

B - W

Input /Output

Signal output to transponder key amplifier

(Code sent from certification ECU (smart key ECU assembly) to transponder key amplifier built into power switch, and then transmitted by transponder key amplifier antenna as radio waves)

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

Pulse generation

(See waveform 3)
  • BCC Malfunction
  • Abnormal Status
  • Different Encrypt Code
  • Different Serial Number
  • Frame Error
  • Response

I1-6 (ANT2) - I1-11 (AGND)

G - W

Input /Output

Signal input from transponder key amplifier

(Radio waves from transponder key amplifier built into power switch used to detect key information. Key information then sent to certification ECU (smart key ECU assembly))

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

Pulse generation

(See waveform 4)

I1-19 (IND) - I1-18 (E)

SB - W-B

Output

Security indicator output

Power switch off → on (IG)

Pulse generation → Below 2 V

-

O61-11 (WCSW) - I1-18 (E)*

P - W-B

Output

Wireless charger system stop signal

Procedure:

  1. Power switch off
  2. Electrical key transmitter sub-assembly inside vehicle
  3. Power switch off → on (ACC)

Below 1 V → 4.5 to 6 V

(For 1 second after power switch on (ACC))

-
  • *: w/ Wireless Charging System

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 power switch on (ACC) or on (IG).
    • To lock the steering, open a door with the power switch off and the shift lever in P.

(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

Measurement Condition

Item

Content

Tester Connection

I1-7 (SPD) - I1-18 (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.

(2) Waveform 2

*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

I1-8 (CLG5) - I1-18 (E)

I1-9 (CG5B) - I1-18 (E)

Tool Setting

2 V/DIV., 500 ms/DIV.

Condition

Procedure:

  1. Power switch off
  2. Electrical key transmitter sub-assembly not inside vehicle
  3. Within 30 seconds of closing any door

(3) Waveform 3

Measurement Condition

Item

Content

Tester Connection

I1-5 (ANT1) - I1-11 (AGND)

Tool Setting

20 V/DIV., 200 ms./DIV.

Condition

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

(4) Waveform 4

Measurement Condition

Item

Content

Tester Connection

I1-6 (ANT2) - I1-11 (AGND)

Tool Setting

20 V/DIV., 200 ms./DIV.

Condition

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

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

(a) Disconnect the I59 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)

Wiring Color

Input / Output

Terminal Description

Condition

Specified Condition

Related Data List Item/DTC

I59-1 (GND) - Body ground

W-B - Body ground

-

Ground

Always

Below 1 Ω

-

I59-6 (IG2) - I59-1 (GND)

B - W-B

Input

IG signal (IG2 power supply input for steering lock motor)

Power switch off

Below 1 V

-

Power switch on (IG)

11 to 14 V

I59-7 (B) - Body ground

L - Body ground

Input

Constant power supply

Power switch off

11 to 14 V

-

(c) Connect the I59 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)

Wiring Color

Input / Output

Terminal Description

Condition

Specified Condition

Related Data List Item/DTC

I59-3 (IGE) - I59-1 (GND)

P - W-B

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
  • Power switch turned off

11 to 14 V → Below 1 V
  • Power Supply Short
  • Unlock Request Receive
  • Lock Request Receive

I59-4 (SLP1) - I59-1 (GND)

SB - W-B

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

I59-5 (LIN) - I59-1 (GND)

G - W-B

Input / Output

LIN communication line

Power switch on (IG)

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 power switch on (ACC) or on (IG).
    • To lock the steering, turn the power switch off with the shift lever in P, and then open a door.

CHECK ID CODE BOX (IMMOBILISER CODE ECU)

(a) Disconnect the I20 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

Wiring Color

Input/Output

Terminal Description

Condition

Specified Condition

Related Data List Item

I20-1 (+B) - Body ground

L - Body ground

Input

Power source

Power switch off

11 to 14 V

-

I20-5 (GND) - Body ground

W-B - Body ground

-

Ground

Always

Below 1 Ω

(c) Reconnect the I20 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

Wiring Color

Input/Output

Terminal Description

Condition

Specified Condition

Related Data List Item

I20-3 (EFII) - I20-5 (GND)

B - W-B

Input

EFI communication input

(Signal input from hybrid vehicle control ECU to ID code box (immobiliser code ECU))

Power switch off

11 to 14 V

Smart Key

  • EFI Code Receive
  • Engine Start Request

I20-3 (EFII) - I20-5 (GND)

B - W-B

Input

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 power switch turned on (IG) after cable disconnected and reconnected to auxiliary battery

Pulse generation

(See waveform 1)

I20-4 (EFIO) - I20-5 (GND)

R - W-B

Output

EFI communication output

(Signal output from ID code box (immobiliser code ECU) to hybrid vehicle control ECU)

Power switch off

Below 1 V

I20-4 (EFIO) - I20-5 (GND)

R - W-B

Output

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 power switch turned on (IG) after cable disconnected and reconnected to auxiliary battery

Pulse generation

(See waveform 2)

I20-2 (LIN1) - I20-5 (GND)

P - W-B

Input/Output

LIN communication line

Power switch on (IG)

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

I20-3 (EFII) - I20-5 (GND)

Tool Setting

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

Condition

Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) after cable disconnected and reconnected to auxiliary battery

(2) Waveform 2

*a

Approximately 160 ms

*b

Approximately 270 ms

Item

Content

Tester Connection

I20-4 (EFIO) - I20-5 (GND)

Tool Setting

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

Condition

Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) after cable disconnected and reconnected to auxiliary battery

CHECK HYBRID VEHICLE CONTROL ECU

(a) Measure the voltage and resistance, and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Input / Output

Terminal Description

Condition

Specified Condition

Related Data List Item/DTC

I2-35 (IG2) - I3-3 (E1)

LG - W-B

Input

Ignition power supply

Power switch on (IG)

11 to 14 V

-

I3-3 (E1) - Body ground

W-B - Body ground

-

Ground

Always

Below 1 Ω

-

I3-23 (IMO) - I3-3 (E1)

B - W-B

Output

EFI communication output

(Signal output from hybrid vehicle control ECU to ID code box (immobiliser code ECU))

Power switch off

11 to 14 V
  • EFI Code Receive
  • Engine Start Request

I3-23 (IMO) - I3-3 (E1)

B - W-B

Output

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 power switch turned on (IG) after cable disconnected and reconnected to auxiliary battery

Pulse generation

(See waveform 1)

I3-10 (IMI) - I3-3 (E1)

R - W-B

Input

EFI communication input

(Signal input from ID code box (immobiliser code ECU) to hybrid vehicle control ECU)

Power switch off

11 to 14 V → 1 V or less

I3-10 (IMI) - I3-3 (E1)

R - W-B

Input

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 power switch turned on (IG) after cable disconnected and reconnected to auxiliary battery

Pulse generation

(See waveform 2)

(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

I3-23 (IMO) - I3-3 (E1)

Tool Setting

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

Condition

Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) 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

I3-10 (IMI) - I3-3 (E1)

Tool Setting

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

Condition

Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) after cable disconnected and reconnected to auxiliary battery

CHECK POWER SWITCH

(a) Measure the resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Input / Output

Terminal Description

Condition

Specified Condition

Related Data List Item/DTC

I119-3 (GND) - Body ground

W - Body ground

-

Transponder key amplifier ground

Always

Below 1 Ω

-

(b) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Input / Output

Terminal Description

Condition

Specified Condition

Related Data List Item/DTC

I119-1 (ANT1) - I119-3 (GND)

B - W

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 power switch, and then transmitted by transponder key amplifier antenna as radio waves)

Power switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power 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

I119-7 (ANT2) - I119-3 (GND)

G - W

Output

Signal output to certification ECU (smart key ECU assembly)

(Radio waves from transponder key amplifier built into power switch used to detect key information. Key information then sent to certification ECU (smart key ECU assembly))

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

Pulse generation

(See waveform 2)

(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

I119-1 (ANT1) - I119-3 (GND)

Tool Setting

20 V/DIV., 200 ms./DIV.

Condition

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

(2) Waveform 2 (Reference)

Measurement Condition

Item

Content

Tester Connection

I119-7 (ANT2) - I119-3 (GND)

Tool Setting

20 V/DIV., 200 ms./DIV.

Condition

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