Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001HAK8
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 09/2022]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): B2278; Engine/Power Switch Malfunction; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

DTC

B2278

Engine/Power Switch Malfunction

DESCRIPTION

This DTC is stored when the SSW1 contact signal, SSW2 contact signal and SSW3 contact signal, which are detected when the engine switch is operated, do not match.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2278

Engine/Power Switch Malfunction

When the engine switch is operated, the SSW1 contact signal, SSW2 contact signal and SSW3 contact signal do not match (1-trip detection logic*).
  • Engine switch
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector

DTC Output Confirmation Operation:

  • Turn the engine switch on (IG).
  • *: Only detected while a malfunction is present.

Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

If either the SSW1 contact signal, SSW2 contact signal or SSW3 contact signal is stuck on, the power source mode cannot be changed by pressing the engine switch. If either the SSW1 contact signal, SSW2 contact signal or SSW3 contact signal is stuck off, emergency stop by pressing and holding the engine switch for 2 seconds or more cannot be operated.

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Related Data List and Active Test Items

DTC No.

Data List and Active Test

B2278

Power Source Control

  • Start Switch1
  • Start Switch2
  • Start Switch3

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus Body Electrical Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

    Click here 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2021 - 2022 MY Corolla Corolla Hatchback GR Corolla [04/2020 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.

READ VALUE USING TECHSTREAM (START SWITCH1, START SWITCH2, START SWITCH3)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Power Source Control / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Start Switch1

Engine switch 1 status

OFF or ON

OFF: Engine switch not pressed

ON: Engine switch pressed
  • If the engine switch is pressed for a short time, the display may not change.
  • Use this item to determine if the engine switch input signal is malfunctioning.

Start Switch2

Engine switch 2 status

OFF or ON

OFF: Engine switch not pressed

ON: Engine switch pressed
  • If the engine switch is pressed for a short time, the display may not change.
  • Use this item to determine if the engine switch input signal is malfunctioning.

Start Switch3

Engine switch 3 status

OFF or ON

OFF: Engine switch not pressed

ON: Engine switch pressed
  • If the engine switch is pressed for a short time, the display may not change.
  • Use this item to determine if the engine switch input signal is malfunctioning.

Body Electrical > Power Source Control > Data List

Tester Display

Start Switch1

Start Switch2

Start Switch3

OK:

The Techstream display changes correctly in response to the engine switch operation.

NG

GO TO STEP 3

OK

2.

READ VALUE USING TECHSTREAM (START SWITCH1, START SWITCH2, START SWITCH3)

(a) Enter the following menus: Body Electrical / Power Source Control / Data List.

(b) According to the display on the Techstream, read the Data List while wiggling the wire harness.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Start Switch1

Engine switch 1 status

OFF or ON

OFF: Engine switch not pressed

ON: Engine switch pressed
  • If the engine switch is pressed for a short time, the display may not change.
  • Use this item to determine if the engine switch input signal is malfunctioning.

Start Switch2

Engine switch 2 status

OFF or ON

OFF: Engine switch not pressed

ON: Engine switch pressed
  • If the engine switch is pressed for a short time, the display may not change.
  • Use this item to determine if the engine switch input signal is malfunctioning.

Start Switch3

Engine switch 3 status

OFF or ON

OFF: Engine switch not pressed

ON: Engine switch pressed
  • If the engine switch is pressed for a short time, the display may not change.
  • Use this item to determine if the engine switch input signal is malfunctioning.

Body Electrical > Power Source Control > Data List

Tester Display

Start Switch1

Start Switch2

Start Switch3

OK:

The Techstream display changes correctly in response to the engine switch operation.

OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ENGINE SWITCH)

(a) Disconnect the I1 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the I35 engine switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I1-23 (SSW1) - I35-12 (SS1)

Always

Below 1 Ω

I1-20 (SSW2) - I35-6 (SS2)

Always

Below 1 Ω

I1-13 (SSW3) - I35-11 (SS3)

Always

Below 1 Ω

I1-11 (AGND) - I35-3 (GND)

Always

Below 1 Ω

I1-23 (SSW1) or I35-12 (SS1) - Other terminals and body ground

Always

10 kΩ or higher

I1-20 (SSW2) or I35-6 (SS2) - Other terminals and body ground

Always

10 kΩ or higher

I1-13 (SSW3) or I35-11 (SS3) - Other terminals and body ground

Always

10 kΩ or higher

I1-11 (AGND) or I35-3 (GND) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT ENGINE SWITCH

(a) Remove the engine switch.

for M20A-FKS: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (STARTING): ENGINE SWITCH: REMOVAL

for 2ZR-FAE: Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (STARTING): ENGINE SWITCH: REMOVAL

(b) Inspect the engine switch.

for M20A-FKS: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (STARTING): ENGINE SWITCH: INSPECTION

for 2ZR-FAE: Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (STARTING): ENGINE SWITCH: INSPECTION

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

NG

REPLACE ENGINE SWITCH

for M20A-FKS: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; M20A-FKS (STARTING): ENGINE SWITCH: REMOVAL

for 2ZR-FAE: Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (STARTING): ENGINE SWITCH: REMOVAL