- The steering lock motor activation command circuit has a short circuit.
- The steering lock motor activation command circuit has an open circuit.
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM1000000028KA6 |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [11/2022 - ] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): B279F1C; Steering Lock Confirmation Signal Circuit Voltage Out of Range; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 - ] | ||
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DTC |
B279F1C |
Steering Lock Confirmation Signal Circuit Voltage Out of Range |
DESCRIPTION
except Manual Transaxle
-
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
Note
B279F1C
Steering Lock Confirmation Signal Circuit Voltage Out of Range
Noise in the LIN communication system, etc.
ID code box (immobiliser code ECU)
No confirmation operation is necessary (monitoring is continuous).
Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected
Fail-safe Function when Malfunction Detected
The engine cannot be started.
-
Related Data List and Active Test Items
DTC No.
Data List and Active Test
B279F1C
-
for Manual Transaxle
-
This DTC is stored when the SLA input (the steering lock motor activation permission signal) sent directly from the certification ECU (smart key ECU assembly) to the steering lock ECU (steering lock actuator or upper bracket assembly) is determined to be abnormal.
HINT:
The steering lock ECU (steering lock actuator or upper bracket assembly) is not connected to the CAN communication system. However, the steering lock ECU (steering lock actuator or upper bracket assembly) is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
Note
B279F1C
Steering Lock Confirmation Signal Circuit Voltage Out of Range
Either of the following conditions is met (1-trip detection logic*):
- Steering lock ECU (steering lock actuator or upper bracket assembly)
- Certification ECU (smart key ECU assembly)
- Wire harness or connector
DTC Output Confirmation Operation:
- Any time
*: Only detected while a malfunction is present and the ignition switch is ON.
Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected
Fail-safe Function when Malfunction Detected
The steering cannot be locked or unlocked. For this reason, the engine cannot be started.
Prohibits the engine from being started (the engine does not start).
Related Data List and Active Test Items
DTC No.
Data List and Active Test
B279F1C
-
WIRING DIAGRAM
for Manual Transaxle
CAUTION / NOTICE / HINT
NOTICE:
-
When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins.
Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Start Key(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS 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
![2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 - ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
-
Before replacing the ID code box (immobiliser code ECU)*1, steering lock ECU (steering lock actuator or upper bracket assembly)*2 or certification ECU (smart key ECU assembly)*2, refer to Registration.
Click here
- *1: except Manual Transaxle
- *2: for Manual Transaxle
- After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
Click here
PROCEDURE
|
1. |
SYSTEM CHECK |
(a) Check the vehicle specification.
|
Result |
Proceed to |
|---|---|
|
for Manual Transaxle |
A |
|
except Manual Transaxle |
B |
| B |
|
|
|
2. |
CHECK FOR DTC |
(a) Using the GTS, check if LIN communication DTC B278588 is output.
Body Electrical > Smart Key > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B278588 is not output |
A |
|
B278588 is output |
B |
| B |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (GROUND) |
Pre-procedure1
(a) Disconnect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
Procedure1
(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 |
Post-procedure1
(c) None
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
Pre-procedure1
(a) Connect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
Procedure1
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I59-6 (SLA) - I59-1 (GND) |
Ignition switch off |
Below 1 V |
|
I59-6 (SLA) - I59-1 (GND) |
Ignition switch ON |
11 to 14 V |
Post-procedure1
(c) None
| NG |
|
|
|
5. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
|
6. |
CLEAR DATA LIST MALFUNCTION RECORD |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal, wait for 30 seconds or more, and then reconnect the cable to the negative (-) auxiliary battery terminal to clear the record of malfunctions stored in the Data List.
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
Click here
|
|
7. |
CHECK FOR DTC |
Pre-procedure1
(a) Perform the DTC output confirmation operation.
Procedure1
(b) Check if DTC B279F1C is output.
Body Electrical > Smart Key > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B279F1C is output |
A |
|
B279F1C is not output |
B |
Post-procedure1
(c) None
| A |
|
REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
| B |
|
SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR) |
|
8. |
CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) |
Pre-procedure1
(a) Disconnect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(b) Disconnect the I167 certification ECU (smart key ECU assembly) connector.
Procedure1
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I59-6 (SLA) - I167-3 (SLA1) |
Always |
Below 1 Ω |
|
I59-6 (SLA) or I167-3 (SLA1) - Other terminals and body ground |
Always |
10 kΩ or higher |
Post-procedure1
(d) None
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
9. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
|
10. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B279F1C is output |
A |
|
B279F1C is not output |
B |
| A |
|
REPLACE ID CODE BOX (IMMOBILISER CODE ECU) |
| B |
|
END |
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