- Certification ECU (smart key ECU assembly)
- Electrical key transmitter sub-assembly
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001H8E0 |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): Additional Key cannot be Registered; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] | ||
|
Additional Key cannot be Registered |
DESCRIPTION
If additional registration is not possible, a malfunction of the electrical key transmitter sub-assembly, certification ECU (smart key ECU assembly), power switch, No. 1 indoor electrical key antenna assembly (front floor), steering lock ECU (steering lock actuator or upper bracket assembly) or door control receiver is suspected.
CAUTION / NOTICE / HINT
NOTICE:
-
If registration of an electrical key transmitter sub-assembly cannot be performed, refer to Registration.
Click here
![2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION](/t3Portal/stylegraphics/info.gif)
- When using the Techstream with the power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus Body Electrical Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream 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
-
Before replacing the certification ECU (smart key ECU assembly), steering lock ECU (steering lock actuator or upper bracket assembly) or electrical key transmitter sub-assembly, refer to Registration.
Click here
- After repair, confirm that no DTCs are output.
HINT:
When additional registration is not possible, freeze frame data may be stored in the certification ECU (smart key ECU assembly).
Click here
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (UNMATCHED VEHICLE-ID) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Smart Key / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Smart Key > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Unmatched Vehicle-ID |
Key No. (incorrect or correct) |
No or Yes |
No: Communication normal Yes: Communication malfunction |
The vehicle ID registered in the vehicle and the vehicle ID registered in the electrical key transmitter sub-assembly are different (if a key from another vehicle is brought into the vehicle exterior detection area while the doors are locked, "Yes" is displayed for "Unmatched Vehicle-ID" in the Data List). Other potential causes:
|
Body Electrical > Smart Key > Data List
|
Tester Display |
|---|
|
Unmatched Vehicle-ID |
|
Result |
Proceed to |
|---|---|
|
"No" is displayed |
A |
|
"Yes" is displayed |
B |
| B |
|
|
|
2. |
READ VALUE USING TECHSTREAM (OPERATION HISTORY) |
(a) Check that the connectors are properly connected to the vehicle and Techstream.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Smart Key / Utility / Operation History / Certification ECU operation log of ID code registration.
Body Electrical > Smart Key > Utility
|
Tester Display |
|---|
|
Operation History |
(f) Check the freeze frame data.
Registration Function (Reason for Non-operation):
|
Parameter Name |
Detection Condition |
Trouble Area |
|---|---|---|
|
New Key ID Registration Stopped (Conditions Other than Vehicle ID not Met) |
The key ID information of the certification ECU (smart key ECU assembly) and unregistered key transmitter sub-assembly did not match due to wave interference around the vehicle or depletion of the battery of the key transmitter sub-assembly. |
|
|
New Key ID Registration Stopped (Key Already Registered) |
A registered electrical key transmitter sub-assembly was used. |
Incorrect registration procedure is used |
|
New Key ID Registration Stopped (ID Code Writing Failure) |
An unregistered electrical key transmitter sub-assembly was held near the power switch, but key ID information was not stored by the certification ECU (smart key ECU assembly). |
Certification ECU (smart key ECU assembly) |
|
New Key ID Registration Stopped (Key Information Malfunction) |
An unregistered electrical key transmitter sub-assembly was held near the power switch, but key ID information was not stored by the certification ECU (smart key ECU assembly). |
Incorrect registration procedure is used |
|
Registration Limit |
An electrical key transmitter sub-assembly was attempted to be registered when the maximum number of electrical key transmitter sub-assemblies that can be registered has been reached. |
Incorrect registration procedure is used |
|
Cannot Enter Registration Mode (Vehicle Speed > 5 km/h) |
The vehicle speed was 5 km/h (3.1 mph) or more. |
Certification ECU (smart key ECU assembly) |
|
Registered Key Confirmation Failed (Immobilizer Certification Failed) |
A registered electrical key transmitter sub-assembly was incorrectly held near the power switch and the certification ECU (smart key ECU assembly) could not complete verification. |
|
|
ECU Code Confirmation Failed (No Response from Connected ECUs) |
The certification ECU (smart key ECU assembly) did not receive a response from the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly). |
|
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ECU Code Confirmation Failed (S Code Certification Failed) |
The authentication code (S code) of the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) did not match. |
|
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ECU Code Confirmation Failed (L Code Certification Failed) |
The authentication code (L code) of the ID code box (immobiliser code ECU) and steering lock ECU (steering lock actuator or upper bracket assembly) did not match. |
|
|
ECU Code Confirmation Failed (Too Many Keys Registered in ID Code Box) |
The maximum number of electrical key transmitter sub-assemblies that can be registered to the ID code box (immobiliser code ECU) has been exceeded. |
ID code box (immobiliser code ECU) |
|
New Key ID Registration Failed (Immobilizer Certification Failed) |
An unregistered electrical key transmitter sub-assembly was incorrectly held near the power switch and the certification ECU (smart key ECU assembly) could not complete verification. |
|
|
New Key ID Registration Failed (Conditions Other than Vehicle ID not Met) |
The key ID information of the certification ECU (smart key ECU assembly) and unregistered key transmitter sub-assembly did not match due to wave interference around the vehicle or depletion of the battery of the key transmitter sub-assembly. |
|
|
New Key ID Registration Failed (Key Already Registered) |
A registered electrical key transmitter sub-assembly was used. |
Certification ECU (smart key ECU assembly) |
|
New Key ID Registration Failed (ID Code Writing Failed) |
An unregistered electrical key transmitter sub-assembly was held near the power switch, but key ID information was not stored by the certification ECU (smart key ECU assembly). |
Certification ECU (smart key ECU assembly) |
|
New Key ID Registration Failed (Key Information Malfunction) |
An unregistered electrical key transmitter sub-assembly was held near the power switch, but key ID information was not stored by the certification ECU (smart key ECU assembly). |
Incorrect registration procedure is used |
|
No Response from Connected ECUs when Registering L/S Codes |
There are no response from the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly) at registration of L code or S code. |
|
|
L Code Registration Failed (ID Code Box, Steering Lock ECU) |
The authentication code (L code) is not registered by the ID code box (immobiliser code ECU) and steering lock ECU (steering lock actuator or upper bracket assembly). |
|
|
S Code Registration Failed (Certification ECU, ID Code Box) |
The authentication code (S code) is not registered by the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU). |
ID code box (immobiliser code ECU) |
|
ECU ID Verification Error |
The certification ECU (smart key ECU assembly) did not receive S code registration response from the ID code box (immobiliser code ECU). |
|
|
Key Number Write Error |
The number of the electrical key transmitter sub-assemblies are not stored by the certification ECU (smart key ECU assembly). |
Certification ECU (smart key ECU assembly) |
|
B Code Registration Failed (Certification ECU, Main Body ECU) |
B code was not stored by the certification ECU (smart key ECU assembly). |
|
|
New Key ID Registration Stopped (Security Access Malfunction) |
.Communication error |
Communication error between the Techstream and key registration server |
|
New Key ID Registration Stopped (Certification ECU Type Malfunction) |
The electrical key transmitter sub-assembly is not compatible with the certification ECU (smart key ECU assembly). |
Certification ECU (smart key ECU assembly) |
|
New Key ID Registration Stopped (Key Type Malfunction) |
The electrical key transmitter sub-assembly is not compatible with the registration mode. |
Electrical key transmitter sub-assembly |
|
Result |
Proceed to |
|---|---|
|
Vehicle operation history related to operation malfunction does not exist |
A |
|
"New Key ID Registration Stopped (Conditions Other than Vehicle ID not Met)" is displayed on the Techstream |
B |
|
"New Key ID Registration Failed (Immobilizer Certification Failed)" is displayed on the Techstream |
|
|
"New Key ID Registration Failed (Conditions Other than Vehicle ID not Met)" is displayed on the Techstream |
|
|
"New Key ID Registration Stopped (Key Already Registered)" is displayed on the Techstream |
C |
|
"New Key ID Registration Stopped (Key Information Malfunction)" is displayed on the Techstream |
|
|
"New Key ID Registration Failed (Key Information Malfunction)" is displayed on the Techstream |
|
|
"New Key ID Registration Stopped (ID Code Writing Failure)" is displayed on the Techstream |
D |
|
"New Key ID Registration Failed (ID Code Writing Failed)" is displayed on the Techstream |
|
|
"Registration Limit" is displayed on the Techstream |
E |
|
"Cannot Enter Registration Mode (Vehicle Speed > 5 km/h)" is displayed on the Techstream |
F |
|
"Registered Key Confirmation Failed (Immobilizer Certification Failed)" is displayed on the Techstream |
G |
|
"ECU Code Confirmation Failed (No Response from Connected ECUs)" is displayed on the Techstream |
H |
|
"No Response from Connected ECUs when Registering L/S Codes" is displayed on the Techstream |
|
|
"ECU Code Confirmation Failed (S Code Certification Failed)" is displayed on the Techstream |
I |
|
"ECU ID Verification Error" is displayed on the Techstream |
|
|
"ECU Code Confirmation Failed (L Code Certification Failed)" is displayed on the Techstream |
J |
|
"L Code Registration Failed (ID Code Box, Steering Lock ECU)" is displayed on the Techstream |
|
|
"ECU Code Confirmation Failed (Too Many Keys Registered in ID Code Box)" is displayed on the Techstream |
K |
|
"S Code Registration Failed (Certification ECU, ID Code Box)" is displayed on the Techstream |
|
|
"New Key ID Registration Failed (Key Already Registered)" is displayed on the Techstream |
L |
|
"Key Number Write Error" is displayed on the Techstream |
M |
|
"New Key ID Registration Stopped (Certification ECU Type Malfunction)" is displayed on the Techstream |
|
|
"B Code Registration Failed (Certification ECU, Main Body ECU)" is displayed on the Techstream |
N |
|
"New Key ID Registration Stopped (Security Access Malfunction)" is displayed on the Techstream |
O |
|
"New Key ID Registration Stopped (Key Type Malfunction)" is displayed on the Techstream |
P |
| B |
|
| C |
|
PERFORM REREGISTRATION |
| D |
|
| E |
|
END (REGISTRATION NOT FINISHED DUE TO MAXIMUM NUMBER OF REGISTERED ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLIES BEING EXCEEDED) (a) If another electrical key transmitter sub-assembly needs to be registered, perform "UNDESIGNATED KEY PERMANENT ERASURE" before performing the registration procedure. Click here
|
| F |
|
| G |
|
| H |
|
| I |
|
| J |
|
| K |
|
REPLACE ID CODE BOX (IMMOBILISER CODE ECU)
|
| L |
|
NEW KEY REGISTRATION FAILED, CHECK THE KEY (a) Check if a registered electrical key transmitter sub-assembly was held near the power switch instead of an unregistered electrical key transmitter sub-assembly by mistake. (b) Perform registration again using an unregistered electrical key transmitter sub-assembly. If the same problem occurs again, replace the certification ECU (smart key ECU assembly). |
| M |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
| N |
|
| O |
|
CHECK TECHSTREAM (a) Check communication between the Techstream and the key registration server. |
| P |
|
REREGISTRATION (a) Replace the electrical key transmitter sub-assembly, register the ID. Click here
|
|
|
3. |
CHECK SMART KEY SYSTEM (for Start Function) |
(a) Remove the transmitter battery from the electrical key transmitter sub-assembly.
|
(b) With the brake pedal depressed, hold the electrical key transmitter sub-assembly near the power switch and check if the power source mode changes. OK: The power source mode changes. HINT: If the power source mode changes, the cabin verification is malfunctioning. |
|
|
Result |
Proceed to |
|---|---|
|
The power source mode changes |
A |
|
The power source mode does not change |
B |
| B |
|
GO TO SMART KEY SYSTEM (for Start Function) (Power Source Mode does not Change to ON (IG and ACC))
|
|
|
4. |
CHECK STEERING LOCK FUNCTION |
(a) The power switch is on (ACC) or on (IG).
(b) Check that the steering unlocks.
HINT:
- When the power switch is turned on (ACC) or on (IG) and the electrical key transmitter assembly and certification ECU (smart key ECU assembly) are verified, the steering is unlocked.
- Check that the communication between the steering lock ECU (steering lock actuator or upper bracket assembly) and certification ECU (smart key ECU assembly) is normal.
OK:
The steering unlocks.
| NG |
|
|
|
5. |
REGISTRATION |
(a) Using an unregistered electrical key transmitter sub-assembly, perform the additional registration procedure.
Click here
OK:
Additional registration can be completed.
| OK |
|
REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY (FIRST REGISTERED KEY WAS DEFECTIVE) |
| NG |
|
|
6. |
REREGISTRATION |
(a) Using an unregistered electrical key transmitter sub-assembly, register the ID.
Click here
OK:
The key ID can be registered.
| OK |
|
END (ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY WAS DEFECTIVE) |
| NG |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
|
7. |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Temporarily replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies.
HINT:
-
For replacement.
Click here
-
For registration.
Click here
OK:
All of the electrical key transmitter sub-assemblies could be registered to the new certification ECU (smart key ECU assembly) successfully.
| OK |
|
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) |
| NG |
|
|
8. |
READ VALUE USING TECHSTREAM (OPERATION HISTORY) |
(a) Connect the Techstream to the DLC3.
(b) Register the key ID.
Click here
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Smart Key / Utility / Operation History / Certification ECU operation log of ID code registration.
Body Electrical > Smart Key > Utility
|
Tester Display |
|---|
|
Operation History |
(f) Check the freeze frame data.
|
Result |
Proceed to |
|---|---|
|
"New Key ID Registration Stopped (Key Already Registered)" is not displayed on the Techstream |
A |
|
"New Key ID Registration Stopped (Key Already Registered)" is displayed on the Techstream |
B |
| A |
|
END (COMMUNICATION ERROR BETWEEN TECHSTREAM AND VEHICLE) |
| B |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
|
9. |
READ VALUE USING TECHSTREAM (VEHICLE SPEED METER) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Combination Meter / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Combination Meter > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Vehicle Speed Meter |
Vehicle speed |
Min.: 0, Max.: 255 |
Almost same as actual vehicle speed (Speedometer tester) |
- |
Body Electrical > Combination Meter > Data List
|
Tester Display |
|---|
|
Vehicle Speed Meter |
OK:
"0 km/h (0 mph)" is displayed when the vehicle is stationary.
| OK |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
| NG |
|
|
10. |
CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY |
(a) Make sure that a registered electrical key transmitter sub-assembly is being used.
OK:
A registered electrical key transmitter sub-assembly is being used.
| NG |
|
USE A REGISTERED ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY AND PERFORM REREGISTRATION |
|
|
11. |
CHECK NUMBER OF REGISTERED ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLIES |
(a) Check the number of registered electrical key transmitter sub-assemblies.
|
Result |
Proceed to |
|---|---|
|
Only one electrical key transmitter sub-assembly is registered |
A |
|
2 or more electrical key transmitter sub-assemblies are registered |
B |
| A |
|
|
|
12. |
REREGISTRATION |
(a) Reregister the electrical key transmitter sub-assemblies using different order combinations.
Click here
HINT:
If there are 2 or more electrical key transmitter sub-assemblies, make sure that the number of order combinations is the same as the number of electrical key transmitter sub-assemblies so that each transmitter can be checked first.
Example: When there are 3 registered electrical key transmitter sub-assemblies (A, B and C).
|
Combination |
Order* |
|---|---|
|
1 |
A → B → C |
|
2 |
B → C→ A |
|
3 |
C → A → B |
- *: Except for the first electrical key transmitter sub-assembly, the remaining electrical key transmitter sub-assemblies can be checked in any order.
OK:
"Key Verification: Read Error" is not displayed.
| OK |
|
REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY (ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY HELD WHEN "Key Verification: Read Error" WAS DETECTED WAS DEFECTIVE) |
|
|
13. |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Temporarily replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies.
HINT:
-
For replacement.
Click here
-
For registration.
Click here
OK:
All of the electrical key transmitter sub-assemblies could be registered to the new certification ECU (smart key ECU assembly) successfully.
| OK |
|
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) |
| NG |
|
REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY |
|
14. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes
NOTICE:
If a malfunction occurs, do not remove/install the vehicle battery before checking for DTCs.
OK:
DTC B2785 is not output.
| NG |
|
|
|
15. |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Temporarily replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies.
HINT:
-
For replacement.
Click here
-
For registration.
Click here
OK:
All of the electrical key transmitter sub-assemblies could be registered to the new certification ECU (smart key ECU assembly) successfully.
| OK |
|
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) |
| NG |
|
REPLACE ID CODE BOX (IMMOBILISER CODE ECU)
|
|
16. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Temporarily replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies.
HINT:
-
For replacement.
Click here
-
For registration.
Click here
OK:
All of the electrical key transmitter sub-assemblies could be registered to the new certification ECU (smart key ECU assembly) successfully.
| OK |
|
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) |
|
|
17. |
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 register the electrical key transmitter sub-assemblies.
Click here
OK:
All of the electrical key transmitter sub-assemblies could be registered to the new steering lock ECU (steering lock actuator or upper bracket assembly) successfully.
| OK |
|
END (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) WAS DEFECTIVE) |
| NG |
|
REPLACE ID CODE BOX (IMMOBILISER CODE ECU)
|
|
18. |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
(a) Temporarily replace the main body ECU (multiplex network body ECU) with a new one and register the electrical key transmitter sub-assemblies.
HINT:
-
For replacement.
Click here
-
For registration.
Click here
OK:
All of the electrical key transmitter sub-assemblies could be registered to the new main body ECU (multiplex network body ECU) successfully.
| OK |
|
END (MAIN BODY ECU (MULTIPLEX NETWROK BODY ECU) WAS DEFECTIVE) |
| NG |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
|
|