Toyota Tacoma (2015-2018) Service Manual: New Key cannot be Registered

Toyota Tacoma (2015-2018) Service Manual / Door Lock / 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 or UPR bracket assembly) or electrical key and TPMS receiver assembly 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

HINT:

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 or UPR bracket assembly) have been replaced.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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. Troubleshoot the smart key system (for Entry Function) after confirming that the communication systems are functioning properly.
Click here
When using the Techstream with the engine 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.
Before replacing the electrical key transmitter sub-assembly, certification ECU (smart key ECU assembly), steering lock ECU (steering lock actuator or UPR bracket assembly), refer to the smart key system (for Entry Function).
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Click here NOTICE:

NOTICE:

If a malfunction occurs, do not remove/install the vehicle battery before checking for DTCs.

OK:

DTC is not output.

GO TO DIAGNOSTIC TROUBLE CODE CHART

2.	READ VALUE USING TECHSTREAM (OPERATION HISTORY LIST)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Smart Key / Utility / Operation History.

(e) 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	Proceed to
Failed Registration Mode	A registration request was sent while in another mode. During registration a different registration request was sent.	-	A
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)	B
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)	C
Vehicle Speed Too High	A registration request is sent with a vehicle speed of 5 km/h or more.	-	D
No ECU Response	The steering lock ECU (steering lock actuator or UPR bracket assembly) was not connected.	Certification ECU (smart key ECU assembly) Steering lock ECU (steering lock actuator or UPR bracket assembly)	E
L Code Verification Error	The L codes registered in the certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator or UPR bracket assembly) did not match.	Certification ECU (smart key ECU assembly) Steering lock ECU (steering lock actuator or UPR bracket assembly)	F
Key Verification: Max Number	The number of electrical key transmitter sub-assemblies registered in the steering lock ECU (steering lock actuator or UPR bracket assembly) was more than 7.	Steering lock ECU (steering lock actuator or UPR bracket assembly)	G
Key Verification: Amp Abnormal	Malfunction of the immobiliser amplifier, such as a short to ground.	Certification ECU (smart key ECU assembly) Engine switch	H
Key Verification: Read Error	Although a registered electrical key transmitter sub-assembly was held near the engine switch, immobiliser system certification did not succeed.	Certification ECU (smart key ECU assembly) Electrical key transmitter sub-assembly	I
Unverified Key	Although all of the registered electrical key transmitter sub-assemblies had been held near the engine 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	J
Transponder Key Amp Error	Malfunction of the immobiliser amplifier, such as a short to ground.	Certification ECU (smart key ECU assembly) Engine switch	H
New Key Registration Error	Although an unregistered electrical key transmitter sub-assembly was held near the engine 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 Engine switch	K
New Key Vehicle ID Error	Although an unregistered electrical key transmitter sub-assembly was held near the engine 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	K
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	K
New Key Already Registered	Although a registered electrical key transmitter sub-assembly was held near the engine switch, time expired or a registration cancellation request was sent.	-	L
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)	B
No Response Registering L/S Code	The certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or UPR bracket assembly) was not connected.	Certification ECU (smart key ECU assembly) Steering lock ECU (steering lock actuator or UPR bracket assembly)	E
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 or UPR bracket assembly).	Certification ECU (smart key ECU assembly) Steering lock ECU (steering lock actuator or UPR bracket assembly)	F
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)	B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

GO TO STEP 4

GO TO STEP 5

CHECK FOR DTC B2785 or B2786

GO TO STEP 6

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPR BRACKET ASSEMBLY)

CHECK FOR DTC B278A or B2784

GO TO STEP 7

GO TO STEP 11

GO TO STEP 13

NEW KEY REGISTRATION FAILED, CHECK THE KEY

3.	CHECK REGISTRATION MODE

(a) Make sure that another mode or different registration mode is not selected.

OK:

Another mode or a different registration mode is not selected.

HINT:

If any mode has been selected, it is necessary to cancel the mode.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REREGISTRATION

4.	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 to the new ECU.

HINT:

For replacement (Click here ).
For registration (Click here ).

OK:

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

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

5.	READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

(e) 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.: 255km/h (158 mph)	Almost the same as actual vehicle speed	-

OK:

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

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

GO TO METER / GAUGE SYSTEM

6.	REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies to the new ECU.

HINT:

For replacement.
Click here
For registration.
Click here

OK:

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

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

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPR BRACKET ASSEMBLY)

7.	CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

(a) Make sure that a registered electrical key transmitter sub-assembly is used.

OK:

A registered electrical key transmitter sub-assembly is used.

USE A REGISTERED ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY AND REREGISTRATION

8.	CHECK NUMBER OF REGISTERED ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLIES

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

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

GO TO STEP 10

9.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Replace the certification ECU (smart key ECU assembly) with a new one and register the electrical key transmitter sub-assemblies to the new ECU.

HINT:

For replacement.
Click here
For registration.
Click here

OK:

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

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

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

10.	REREGISTRATION

(a) Reregister the electrical key transmitter sub-assemblies using different order combinations.

Click here OK:

OK:

"Key Verification Error" is not displayed.

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

HINT:

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

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

11.	CHECK FOR ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

(a) Check that all registered electrical key transmitter sub-assemblies are available.

OK:

No registered electrical key transmitter sub-assemblies are missing.

ERASE ALL REGISTERED ELECTRICAL KEY TRANSMITTERS EXCEPT ONE, THEN REGISTER THE REMAINING ELECTRICAL KEY TRANSMITTERS

12.	REREGISTRATION

(a) Reregister the electrical key transmitter sub-assemblies using different order combinations.

Click here OK:

OK:

"Key Verification Error" is not displayed.

HINT:

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.

HINT:

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

13.	REREGISTRATION

(a) Using an unregistered electrical key transmitter sub-assembly, register the ID.

OK:

The key ID can be registered.

END (ELECTRICAL KEY TRANSMITTER WAS DEFECTIVE)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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