Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM1000000028LVO
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: NETWORKING: LIN COMMUNICATION SYSTEM: B278187; Steering Lock System Missing Message; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]

DTC

B278187

Steering Lock System Missing Message

DESCRIPTION

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator with ECU assembly) stops for 10 seconds or more.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B278187

Steering Lock System Missing Message

No communication between certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator with ECU assembly) for 10 seconds or more.
  • Certification ECU (smart key ECU assembly)
  • Steering lock ECU (steering lock actuator with ECU assembly)
  • Wire harness or connector

Smart Key

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • When using the GTS with the ignition switch off, perform lock and unlock operations using the door control switch of the multiplex network master switch assembly at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins, and then select the vehicle model manually.

    Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key (CAN). While using the GTS, periodically perform lock and unlock operations using the door control switch of the multiplex network master switch assembly at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • Before replacing the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator with ECU assembly), refer to Registration.

    for HV Model: Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

    for Gasoline Model: Click here 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ECU (STEERING LOCK ACTUATOR WITH ECU ASSEMBLY))

(a) Disconnect the I167 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the I59 steering lock ECU (steering lock actuator with ECU assembly) connector.

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

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I167-8 (LIN) - I59-5 (LIN)

Ignition switch off

Below 1 Ω

I167-8 (LIN) or I59-5 (LIN) - Body ground

Ignition switch off

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR WITH ECU ASSEMBLY) - AUXILIARY BATTERY AND BODY GROUND)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I59-7 (B) - I59-1 (GND)

Always*1

Ignition switch off*2

11 to 14 V
  • *1: for Gasoline Model
  • *2: for HV Model

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I59-1 (GND) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR WITH ECU ASSEMBLY)

(a) Replace the steering lock ECU (steering lock actuator with ECU assembly).

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: DISASSEMBLY

NEXT

4.

REGISTER ECU CODE REGISTRATION

(a) Register the recognition codes in the ECUs.

for HV Model: Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

for Gasoline Model: Click here 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

NEXT

5.

CHECK FOR DTC

(a) Clear the DTCs.

Body Electrical > Smart Key > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Smart Key > Trouble Codes

OK:

DTC B278187 is not output.

OK

END (STEERING LOCK ECU (STEERING LOCK ACTUATOR WITH ECU ASSEMBLY) WAS DEFECTIVE)
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)