Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000028KAN |
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): Unable to Unlock Steering Wheel (Engine cannot Start); 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 - ] |
Unable to Unlock Steering Wheel (Engine cannot Start)
|
DESCRIPTION
The steering lock ECU (steering lock actuator or upper bracket assembly) activates the steering lock motor and moves the lock bar into the steering column to lock the steering.
The steering may not unlock when the lock bar gets stuck in the lock hole of the steering column. In this case, if the ignition switch is turned to ON while shaking the steering wheel, as is done for a vehicle with a mechanical key, the lock bar will be unlocked. If the ID code box (immobiliser code ECU) or ECM is replaced, the system needs to be initialized. Otherwise, the steering cannot be unlocked and the engine cannot be started.
Related Data List and Active Test Items
Problem Symptom
|
Data List and Active Test
|
Unable to unlock steering wheel (Engine cannot start)
|
Smart Key
-
Steering Unlock Request Receive
-
S Code Check
-
L Code Check
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
1.
|
CHECK ENGINE SWITCH (SWITCH CONDITION)
|
(a) Check the power source mode change.
(1) When the electrical key transmitter sub-assembly is inside the vehicle, check that pressing the engine switch with the clutch pedal released causes the power source mode to change as follows:
OK:
Off → ACC → ON → Off
OK
|
|
|
2.
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CHECK MULTI-INFORMATION DISPLAY
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(a) With the ignition switch ON, check that Steering Lock active is displayed on the multi-information display in the combination meter assembly.
Result
|
Proceed to
|
Steering Lock active is displayed
|
A
|
Steering Lock active is not displayed
|
B
|
A
|
|
|
(a) Turn the steering wheel left and right, and then press the engine switch.
(b) Check that the steering is unlocked.
Result
|
Proceed to
|
The steering is unlocked
|
A
|
The steering is not unlocked
|
B
|
A |
|
END (STEERING LOCK NORMAL)
|
B
|
|
|
(a) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes
NOTICE:
If a malfunction occurs, do not remove/install the vehicle auxiliary battery before checking for DTCs.
OK:
DTCs are not output.
OK
|
|
|
5.
|
READ VALUE USING GTS (STEERING UNLOCK REQUEST RECEIVE)
|
(a) Read the Data List according to the display on the GTS.
Body Electrical > Smart Key > Data List
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
Steering Unlock Request Receive
|
Status of steering unlock command from certification ECU (smart key ECU assembly)
|
OK or NG
|
OK: Certification ECU (smart key ECU assembly) sends steering unlock command (within 10 seconds of ignition switch turned ACC or ON, or of engine start operation performed)
NG: Certification ECU (smart key ECU assembly) does not send steering unlock command (ignition switch not turned ACC or ON, and engine start operation not performed)
|
-
The engine cannot be started when an unlock request signal cannot be received.
-
If OK is not displayed even though the steering unlock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.
|
Body Electrical > Smart Key > Data List
Tester Display
|
Steering Unlock Request Receive
|
OK:
Within 10 seconds of turning the ignition switch to ACC or ON or starting the engine, the Data List item changes to "OK".
OK
|
|
|
6.
|
READ VALUE USING GTS (S CODE CHECK)
|
(a) Read the Data List according to the display on the GTS.
Body Electrical > Smart Key > Data List
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
S Code Check
|
Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU)
|
OK or NG
|
OK: Verification result normal
NG: Verification result abnormal
|
When NG is displayed:
-
The ID code for the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is not registered, or the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning.
-
The steering cannot be locked.
-
The steering cannot be unlocked (the engine cannot be started).
|
Body Electrical > Smart Key > Data List
Tester Display
|
S Code Check
|
OK:
OK is displayed on the GTS.
HINT:
Reasons for verification failure:
-
The certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning.
-
There is a problem with the communication between ECUs.
-
An ECU was replaced, but not registered.
-
An ECU was replaced with an ECU which has already been registered to another vehicle.
OK
|
|
|
7.
|
READ VALUE USING GTS (L CODE CHECK)
|
(a) Read the Data List according to the display on the GTS.
Body Electrical > Smart Key > Data List
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
L Code Check
|
Verification result between ID code box (immobiliser code ECU) and steering lock ECU (steering lock actuator or upper bracket assembly)
|
OK or NG
|
OK: Verification result normal
NG: Verification result abnormal
|
When NG is displayed:
-
The ID code for the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly) is not registered, or the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly) is malfunctioning.
-
The steering cannot be locked.
-
The steering cannot be unlocked (the engine cannot be started).
|
Body Electrical > Smart Key > Data List
Tester Display
|
L Code Check
|
OK:
OK is displayed on the GTS.
HINT:
Reasons for verification failure:
-
The steering lock ECU (steering lock actuator or upper bracket assembly) or certification ECU (smart key ECU assembly) is malfunctioning.
-
There is a problem with the communication between ECUs.
-
An ECU is replaced, but is not registered.
-
An ECU is replaced with an ECU which has a code already stored in it.
OK
|
|
|
8.
|
CHECK HARNESS AND CONNECTOR (POWER SOURCE AND GROUND)
|
(a) Disconnect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(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
|
NOTICE:
If the result is not as specified, check for looseness in the ground cable connection.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
I59-7 (B) - Body ground
|
Always
|
11 to 14 V
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
9.
|
CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)
|
(a) Connect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
|
|
*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
|
|
|
(b) 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)
|
NG
|
|
|
10.
|
CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))
|
(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.
(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
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
11.
|
CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)
|
(a) Connect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
|
|
*a
|
Component with harness connected
(Steering lock ECU (steering lock actuator or upper bracket assembly))
|
|
|
(b) Connect the I167 certification ECU (smart key ECU assembly) connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
I59-3 (IGE) - Body ground
|
Always
|
11 to 14 V
|
12.
|
CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)
|
(a) Replace the steering lock ECU (steering lock actuator or upper bracket assembly) with a new one and perform registration.
HINT:
For replacement.
Click here
(b) Read the Data List according to the display on the GTS.
Body Electrical > Smart Key > Data List
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
L Code Check
|
Verification result between ID code box (immobiliser code ECU) and steering lock ECU (steering lock actuator or upper bracket assembly)
|
OK or NG
|
OK: Verification result normal
NG: Verification result abnormal
|
When NG is displayed:
-
The ID code for the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly) is not registered, or the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly) is malfunctioning.
-
The steering cannot be locked.
-
The steering cannot be unlocked (the engine cannot be started).
|
Body Electrical > Smart Key > Data List
Tester Display
|
L Code Check
|
OK:
OK is displayed on the GTS.
OK |
|
END (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) WAS DEFECTIVE)
|
13.
|
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
(a) Replace the certification ECU (smart key ECU assembly) with a new one and perform registration.
Click here
(b) Read the Data List according to the display on the GTS.
Body Electrical > Smart Key > Data List
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
S Code Check
|
Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU)
|
OK or NG
|
OK: Verification result normal
NG: Verification result abnormal
|
When NG is displayed:
-
The ID code for the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is not registered, or the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning.
-
The steering cannot be locked.
-
The steering cannot be unlocked (the engine cannot be started).
|
Body Electrical > Smart Key > Data List
Tester Display
|
S Code Check
|
OK:
OK is displayed on the GTS.
OK |
|
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)
|
14.
|
CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)
|
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
I59-4 (SLP1) - Body ground
|
Steering locked
|
11 to 14 V
|
|
|
*a
|
Component with harness connected
(Steering lock ECU (steering lock actuator or upper bracket assembly))
|
|
|
OK
|
|
|
15.
|
READ VALUE USING GTS (STEERING UNLOCK REQUEST RECEIVE)
|
(a) Replace the certification ECU (smart key ECU assembly) with a new one and perform registration.
Click here
(b) Turn the ignition switch to ON.
(c) Read the Data List according to the display on the GTS.
Body Electrical > Smart Key > Data List
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
Steering Unlock Request Receive
|
Status of steering unlock command from certification ECU (smart key ECU assembly)
|
OK or NG
|
OK: Certification ECU (smart key ECU assembly) sends steering unlock command (within 10 seconds of ignition switch turned ACC or ON, or of engine start operation performed)
NG: Certification ECU (smart key ECU assembly) does not send steering unlock command (ignition switch not turned ACC or ON, and engine start operation not performed)
|
-
The engine cannot be started when an unlock request signal cannot be received.
-
If OK is not displayed even though the steering unlock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.
|
Body Electrical > Smart Key > Data List
Tester Display
|
Steering Unlock Request Receive
|
OK:
Within 10 seconds after the ignition switch is turned to ACC or ON or the engine is started, the Data List item changes to "OK".
OK |
|
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)
|
16.
|
CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))
|
(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.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I59-4 (SLP1) - I167-11 (SLP)
|
Always
|
Below 1 Ω
|
I59-4 (SLP1) or I167-11 (SLP) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
17.
|
READ VALUE USING GTS (STEERING UNLOCK REQUEST RECEIVE)
|
(a) Replace the steering lock ECU (steering lock actuator or upper bracket assembly) with a new one and perform registration.
HINT:
-
For replacement.
Click here
-
For registration.
Click here
(b) Turn the ignition switch to ON.
(c) Use the Data List to check if the steering lock request is functioning properly.
Body Electrical > Smart Key > Data List
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
Steering Unlock Request Receive
|
Status of steering unlock command from certification ECU (smart key ECU assembly)
|
OK or NG
|
OK: Certification ECU (smart key ECU assembly) sends steering unlock command (within 10 seconds of ignition switch turned ACC or ON, or of engine start operation performed)
NG: Certification ECU (smart key ECU assembly) does not send steering unlock command (ignition switch not turned ACC or ON, and engine start operation not performed)
|
-
The engine cannot be started when an unlock request signal cannot be received.
-
If OK is not displayed even though the steering unlock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.
|
Body Electrical > Smart Key > Data List
Tester Display
|
Steering Unlock Request Receive
|
OK:
Within 10 seconds of turning the ignition switch to ACC or ON or starting the engine, the Data List item changes to "OK".
OK |
|
END (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) WAS DEFECTIVE)
|
|