Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000028K9Y |
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): B278215; Power Source Control System Circuit Short to Battery or Open; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 - ] |
DTC
|
B278215
|
Power Source Control System Circuit Short to Battery or Open
|
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
|
B278215
|
Power Source Control System Circuit Short to Battery or Open
|
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
|
B278215
|
-
|
for Manual Transaxle
-
The certification ECU (smart key ECU assembly) has a power source mode switching function.
This DTC is stored when the IGE 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
|
B278215
|
Power Source Control System Circuit Short to Battery or Open
|
Either of the following conditions is met (1-trip detection logic (Only output while a malfunction is present and the ignition switch is ON.)):
-
The steering lock motor activation command circuit has a short circuit.
-
The steering lock motor activation command circuit has an open circuit.
HINT:
If the power supply signal from the LIN communication line does not match the power supply signal from the direct line, the system is determined to be malfunctioning.
|
-
Steering lock ECU (steering lock actuator or upper bracket assembly)
-
Certification ECU (smart key ECU assembly)
-
Wire harness or connector
|
DTC Output Confirmation Operation:
-
Perform a steering lock/unlock operation. (The steering locks when a door is opened with the ignition switch off. The steering unlocks when the ignition switch is turned to ACC or ON while carrying the key.)
|
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
|
B278215
|
-
|
WIRING DIAGRAM
for Manual Transaxle
CAUTION / NOTICE / HINT
PROCEDURE
(a) Check the vehicle specification.
Result
|
Proceed to
|
for Manual Transaxle
|
A
|
except Manual Transaxle
|
B
|
A
|
|
|
2.
|
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
|
OK
|
|
|
3.
|
CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)
|
(a) Check the signal waveform according to the condition(s) in the table below.
Tester Connection
|
Condition
|
Tool Setting
|
Specified Condition
|
I59-3 (IGE) - I59-1 (GND)
|
Steering lock motor operating when all conditions met, and then door opened:
-
Steering unlocked
-
Ignition switch turned off
|
2 V/DIV., 200 ms./DIV.
|
Pulse generation
(See waveform)
|
Result:
|
|
*a
|
Component with harness connected
(Steering lock ECU (steering lock actuator or upper bracket assembly))
|
*b
|
Waveform
|
*c
|
Steering lock motor not operating
|
*d
|
Steering lock motor operating
|
|
|
OK
|
|
|
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
NEXT
|
|
|
5.
|
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:
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notices before proceeding with work.
Click here
NEXT
|
|
|
Pre-procedure1
(a) Perform the DTC output confirmation operation.
Procedure1
(b) Check if DTC B278215 is output.
Body Electrical > Smart Key > Trouble Codes
Result
|
Proceed to
|
B278215 is not output
|
A
|
B278215 is output
|
B
|
Post-procedure1
(c) None
A |
|
SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR)
|
7.
|
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
|
I59-3 (IGE) - I167-24 (SLR+)
|
Always
|
Below 1 Ω
|
I59-3 (IGE) or I167-24 (SLR+) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
NOTICE:
Check for deformation and corrosion of the connector case and terminals.
Post-procedure1
(d) None
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
NEXT
|
|
|
(a) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes
OK:
DTC B278215 is not output.
OK |
|
END
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