| Last Modified: 08-23-2025 | 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 - 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - ] | ||
|
DTC |
B278187 |
Steering Lock System Missing Message |
DESCRIPTION
w/ Steering Lock:
- 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.
w/o Steering Lock:
- As this DTC is not normally output, it may be due to noise in the LIN communication system, etc.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
DTC Output from |
|---|---|---|---|---|
|
B278187 |
Steering Lock System Missing Message |
w/ Steering Lock:
w/o Steering Lock:
|
w/ Steering Lock:
w/o Steering Lock:
|
Smart Key |
WIRING DIAGRAM
w/ Steering Lock
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), steering lock ECU (steering lock actuator with ECU assembly)*1 or ID code box (immobiliser code ECU)*2, refer to Registration.
for HV Model: Click here
![2023 - 2026 MY Corolla Corolla HV [09/2022 - ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION](/t3Portal/stylegraphics/info.gif)
for Gasoline Model: Click here
- *1: w/ Steering Lock
- *2: w/o Steering Lock
PROCEDURE
|
1. |
CONFIRM MODEL |
(a) Choose the model to be inspected.
|
Result |
Proceed to |
|---|---|
|
w/ Steering Lock |
A |
|
w/o Steering Lock |
B |
| B |
|
|
|
2. |
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 |
|
|
3. |
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 |
|
|
4. |
REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR WITH ECU ASSEMBLY) |
(a) Replace the steering lock ECU (steering lock actuator with ECU assembly).
Click here
|
|
5. |
REGISTER ECU CODE REGISTRATION |
(a) Register the recognition codes in the ECUs.
for HV Model: Click here
for Gasoline Model: Click here
|
|
6. |
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)
|
|
7. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
|
8. |
CHECK FOR DTC |
(a) Recheck for DTCs.
Body Electrical > Smart Key > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B278187 is not output |
A |
|
B278187 is output |
B |
| A |
|
| B |
|
|
|