Toyota Yaris: Smart Key System (for Start Function) / 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), engine switch, No. 1 indoor electrical key antenna assembly (front floor), steering lock ECU (steering lock actuator or upper bracket assembly), smart door control receiver assembly is suspected.
CAUTION / NOTICE / HINT
NOTICE:
-
If registration of an electrical key transmitter sub-assembly cannot be performed, refer to Registration.
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- When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS 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.
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-
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.
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- 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).
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PROCEDURE
| 1. | CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Key > Trouble CodesNOTICE:
If a malfunction occurs, do not remove/install the vehicle auxiliary battery before checking for DTCs.
OK:
DTCs are not output.
| NG |
 | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
| 2. | READ VALUE USING GTS (VEHICLE ID DIFFERENCE (KEY REGISTRATION)) |
(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 |
|---|---|---|---|---|
| Vehicle ID Difference (Key Registration) | Status of vehicle ID (key registration) | No or Yes | No: Vehicle ID normal (key registration) Yes: Vehicle ID malfunction (key registration) | - |
| Tester Display |
|---|
| Vehicle ID Difference (Key Registration) |
| Result | Proceed to |
|---|---|
| "No" is displayed | A |
| "Yes" is displayed | B |
| B |
 | GO TO STEP 6 |
|
| 3. | READ VALUE USING GTS (VEHICLE CONTROL HISTORY (ROB)) |
(a) Read the Vehicle Control History (RoB) according to the display on the GTS.
Body Electrical > Smart Key > Utility| Tester Display |
|---|
| Vehicle Control History (RoB) |
Registration Function (Reason for Non-operation):
| Parameter Name | Detection Condition | Trouble Area |
|---|---|---|
| New Key ID Registration Stopped (Security Access Malfunction) | Communication error | Communication error between the GTS 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 1) | The electrical key transmitter sub-assembly is not compatible with the registration mode. | Electrical key transmitter sub-assembly |
| New Key ID Registration Stopped (Key Type Malfunction 2) | The electrical key transmitter sub-assembly is not compatible with the certification ECU (smart key ECU assembly). | Electrical key transmitter sub-assembly |
| Result | Proceed to |
|---|---|
| Vehicle control history related to operation malfunction does not exist | A |
| "New Key ID Registration Stopped (Security Access Malfunction)" is displayed on the GTS | B |
| "New Key ID Registration Stopped (Certification ECU Type Malfunction)" is displayed on the GTS | C |
| "New Key ID Registration Stopped (Key Type Malfunction 1)" is displayed on the GTS | D |
| "New Key ID Registration Stopped (Key Type Malfunction 2)" is displayed on the GTS |
| B |
 | PERFORM REREGISTRATION |
| C |
 | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| D |
 | REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY |
|
| 4. | 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 engine 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)) |
|
| 5. | CHECK STEERING LOCK FUNCTION |
(a) The ignition switch is ACC or ON.
(b) Check that the steering unlocks.
HINT:
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 |
 | GO TO SMART KEY SYSTEM (for Start Function) (Unable to Unlock Steering Wheel (Engine cannot Start)) |
|
| 6. | REGISTRATION |
(a) Using an unregistered electrical key transmitter sub-assembly, perform the additional registration procedure.
OK:
Additional registration can be completed.
| OK |
 | REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY ((FIRST REGISTERED KEY WAS DEFECTIVE)) |
|
| 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.
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-
For registration.
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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 |
 | GO TO OTHER PROBLEM (New Key cannot be Registered) |
New Key cannot be Registered
DESCRIPTION If a new electrical key transmitter sub-assembly could not be registered, wave interference or a malfunction of the certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU), electrical key transmitter sub-assembly, steering lock ECU (steering lock actuator or upper bracket assembly), smart door control receiver assembly is suspected...
New Key Registration Warning Message is not Displayed
DESCRIPTION If the new key registration warning message is not displayed after an electrical key transmitter sub-assembly has been registered, there may be communication problem between the certification ECU (smart key ECU assembly) and combination meter assembly (meter ECU)...
Other information:
Toyota Yaris XP210 (2020-2023) Reapir and Service Manual: Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts...
Toyota Yaris XP210 (2020-2023) Reapir and Service Manual: Removal
REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during the transfer assembly removal/installation are shown below...
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