SMART KEY SYSTEM (for Entry Function) New Key cannot be Registered

DESCRIPTION

If an electrical key transmitter could not be newly registered, wave interference or a malfunction of the certification ECU (smart key ECU assembly), electrical key transmitter sub-assembly, steering lock ECU (steering lock actuator assembly) or door control receiver is suspected.

The registration to add another electrical key transmitter sub-assembly (without replacing any parts) is called "additional key ID registration"

If additional registration is not possible, refer to "Additional Key cannot be Registered" Click here.

Tech Tips

If any of the following have been performed, new registration of the electrical key transmitter sub-assembly is necessary:

The certification ECU (smart key ECU assembly) has been replaced.
The certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator assembly) have been replaced.

WIRING DIAGRAM

INSPECTION PROCEDURE

Note

If registration of an electrical key transmitter sub-assembly is not possible, first confirm the procedure by engine immobiliser system. Click here
A new registration mode can be entered only when no electrical key transmitter sub-assemblies are stored in the certification ECU (smart key ECU assembly).
The smart key system (for Entry Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the smart key system (for Entry Function) after confirming that the communication systems are functioning properly.
When using the Techstream with the power switch off to troubleshoot: Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.
Before replacing the electrical key transmitter sub-assembly, certification ECU (smart key ECU assembly), steering lock ECU (steering lock actuator assembly), refer to the smart key system (for Entry Function) Precaution Click here
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

CHECK FOR DTC
1. Check for DTCs Click here.
  
  Note
  
  If a malfunction occurs, do not remove/install the vehicle auxiliary battery before checking for DTCs.
  
  OK
  
  DTC is not output.
NG
GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

OK

OK
DTC is not output.

READ VALUE USING TECHSTREAM (OPERATION HISTORY LIST)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / Smart Key / Utility / Operation History.

Check the freeze frame data and follow the instructions in the step column of the table below.

Certification ECU Log of ID code registration
Parameter Name	Detection Condition	Trouble Area	Step
Failed Registration Mode	A registration request was sent while in another mode. During registration a different registration request was sent.	-	Go to step 3
Vehicle ID not set	A vehicle ID has not been registered in the certification ECU (smart key ECU assembly).	Certification ECU (smart key ECU assembly)	Replace certification ECU (smart key ECU assembly) Click here
Key Registration Max	A registration request is sent when the maximum number of electrical key transmitter sub-assemblies has already been registered.	Certification ECU (smart key ECU assembly)	Go to step 6
ID-BOX Error	A registration request is sent even though whether or not the vehicle is provided with an ID code box is unknown.	Certification ECU (smart key ECU assembly)	Check for DTC B2789
Vehicle Speed Too High	A registration request is sent with a vehicle speed of 5 km/h or more.	-	Check if the vehicle is stationary. If a code cannot be registered even though the vehicle is stationary, then go to step 4
No ECU Response	The steering lock ECU (steering lock actuator assembly) was not connected.	Certification ECU (smart key ECU assembly) Steering lock ECU (steering lock actuator assembly)	Check for DTC B2785 or B2786
L Code Verification Error	The L codes registered in the certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator assembly) did not match.	Certification ECU (smart key ECU assembly) Steering lock ECU (steering lock actuator assembly)	Go to step 5
Key Verification: Max Number	The number of electrical key transmitter sub-assemblies registered in the steering lock ECU (steering lock actuator assembly) was more than 7.	Steering lock ECU (steering lock actuator assembly)	Replace steering lock ECU (steering lock actuator assembly) Click here
Key Verification: Amp Abnormal	Malfunction of the immobiliser amplifier, such as a short to ground.	Certification ECU (smart key ECU assembly) Power switch	Check for DTC B278A or B2784
Key Verification: Read Error	Although a registered electrical key transmitter sub-assembly was held near the power switch, immobiliser system certification did not succeed.	Certification ECU (smart key ECU assembly) Electrical key transmitter sub-assembly	Go to step 7
Unverified Key	Although all of the registered electrical key transmitter sub-assemblies had been held near the power switch, electrical key transmitter sub-assembly registration was not possible due to immobiliser system certification not being able to succeed.	Certification ECU (smart key ECU assembly) Electrical key transmitter sub-assembly	Go to step 11
Transponder Key Amp Error	Malfunction of the immobiliser amplifier, such as a short to ground.	Certification ECU (smart key ECU assembly) Power switch	Check for DTC B278A or B2784
New Key Registration Error	Although an unregistered electrical key transmitter sub-assembly was held near the power switch, electrical key transmitter sub-assembly registration is not possible due to immobiliser system certification not being able to succeed.	Certification ECU (smart key ECU assembly) Electrical key transmitter sub-assembly Power switch	Go to step 13
New Key Vehicle ID Error	Although an unregistered electrical key transmitter sub-assembly was held near the power switch, electrical key transmitter sub-assembly registration is not possible due to the vehicle ID not being stored successfully.	Certification ECU (smart key ECU assembly) Electrical key transmitter sub-assembly	Go to step 13
New Key Registration Failed	After successful immobiliser system certification, time expired before smart recognition completion confirmation or a registration cancellation request was sent.	Certification ECU (smart key ECU assembly) Electrical key transmitter sub-assembly	Go to step 13
New Key Already Registered	Although a registered electrical key transmitter sub-assembly was held near the power switch, time expired or a registration cancellation request was sent.	-	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. 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). Click here
New Key ID Code Error	Electrical key transmitter sub-assembly registration was not possible due to the certification ECU (smart key ECU assembly) not being able to store the information of the electrical key transmitter sub-assembly to EEPROM correctly.	Certification ECU (smart key ECU assembly)	Replace certification ECU (smart key ECU assembly) Click here
No Response Registering L/S Code	The certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator assembly) was not connected.	Certification ECU (smart key ECU assembly) Steering lock ECU (steering lock actuator assembly)	Check for DTC B2785.
L Code Verification NG	The L code could not be stored by the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator assembly).	Certification ECU (smart key ECU assembly) Steering lock ECU (steering lock actuator assembly)	Go to step 5
Key Number Write Error	The certification ECU (smart key ECU assembly) could not store the number of electrical key transmitter sub-assemblies to EEPROM.	Certification ECU (smart key ECU assembly)	Replace certification ECU (smart key ECU assembly) Click here
ID Code BOX Write Error	The certification ECU (smart key ECU assembly) could not store the information of whether or not the ID code box was provided in the vehicle to EEPROM.	Certification ECU (smart key ECU assembly)	Replace certification ECU (smart key ECU assembly) Click here

CHECK REGISTRATION MODE
1. Make sure that another mode or different registration mode is not selected.
  
  OK
  
  Another mode or a different registration mode is not selected.
  
  Tech Tips
  
  If any mode has been selected, it is necessary to cancel the mode.
NG
REREGISTRATION Click here

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

OK
Another mode or a different registration mode is not selected.

READ VALUE USING TECHSTREAM (VEHICLE SPEED)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / Combination Meter / Data List.

Read the Data List according to the display on the Techstream.

Combination Meter
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Vehicle Speed Meter	Vehicle speed/Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)	Almost the same as actual vehicle speed	-

OK
"0 km/h (0 mph)" is displayed when the vehicle is stationary.

GO TO METER / GAUGE SYSTEM Click here

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
1. Temporarily replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies to the new ECU.
  Tech Tips
  - For replacement, Click here.
  - For registration, Click here.
  OK
  
  Registration to the new certification ECU (smart key ECU assembly) has completed successfully.
NG
REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)

OK

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
1. Temporarily replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies to the new ECU.
  Tech Tips
  - For replacement, Click here.
  - For registration, Click here.
NEXT

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)
CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY
1. Make sure that a registered electrical key transmitter sub-assembly is used.
  
  OK
  
  A registered electrical key transmitter sub-assembly is used.
NG
USE A REGISTERED ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY AND REREGISTRATION Click here

OK

OK
Registration to the new certification ECU (smart key ECU assembly) has completed successfully.

OK
A registered electrical key transmitter sub-assembly is used.

CHECK NUMBER OF REGISTERED ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLIES

Check the number of registered electrical key transmitter sub-assemblies.

Result

Result	Proceed to
When only one electrical key transmitter sub-assembly is registered	A
When 2 or more electrical key transmitter sub-assemblies are registered	B

REREGISTRATION Click here

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
1. Temporarily replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies to the new ECU.
  Tech Tips
  - For replacement, Click here.
  - For registration, Click here.
  OK
  
  Registration to the new certification ECU (smart key ECU assembly) has completed successfully.
NG
REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

OK

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)

OK
Registration to the new certification ECU (smart key ECU assembly) has completed successfully.

REREGISTRATION

Reregister the electrical key transmitter sub-assemblies using different order combinations Click here.

OK
"Key Verification Error" is not displayed.

Tech Tips

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 the first electrical key transmitter sub-assembly, the remaining electrical key transmitter sub-assemblies can be checked in any order.

Tech Tips

The electrical key transmitter sub-assembly held near the power switch when the malfunction was detected is defective. The defective electrical key transmitter sub-assembly is the one that should be replaced.

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

CHECK FOR ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY
1. Check that all registered electrical key transmitter sub-assemblies are available.
  
  OK
  
  No registered electrical key transmitter sub-assemblies are missing.
NG
ERASE ALL REGISTERED ELECTRICAL KEY TRANSMITTERS EXCEPT ONE, THEN REGISTER THE REMAINING ELECTRICAL KEY TRANSMITTERS Click here

OK

OK
No registered electrical key transmitter sub-assemblies are missing.

REREGISTRATION

Reregister the electrical key transmitter sub-assemblies using different order combinations Click here.

OK
"Key Verification Error" is not displayed.

Tech Tips

If there are 2 or more electrical key transmitters, make sure that the number of order combinations is the same as the number of electrical key transmitters 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 the first electrical key transmitter sub-assembly, the remaining electrical key transmitter sub-assemblies can be checked in any order.

Tech Tips

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

REREGISTRATION
1. Using an unregistered electrical key transmitter sub-assembly, register the ID Click here.
  
  OK
  
  The key ID can be registered.
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

OK

END (ELECTRICAL KEY TRANSMITTER WAS DEFECTIVE)