Toyota Yaris: Smart Key System (for Start Function) / How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
- Replace parts related to the wireless door lock control system and smart key system according to the inspection procedure.
- If the wireless door lock control system and smart key system do not operate, check the customize settings and make sure that the wireless door lock control system and smart key system are not disabled.
-
The wireless door lock control system and smart key system primarily use the following systems.
- Power door lock control system
- Wireless door lock control system
- Smart key system (for Entry Function)
-
Smart key system (for Start Function)
- Steering lock function
- Immobiliser function
- If 2 or more electrical key transmitter sub-assemblies are registered to the system, make sure to perform troubleshooting with all of them.
PROCEDURE
| 1. | VEHICLE BROUGHT TO WORKSHOP |
(a) Confirm how the vehicle was brought to the workshop.
- Vehicle was driven.
- Vehicle was towed.
HINT:
The cause of the malfunction may be narrowed down by confirming whether the vehicle was driven or towed.
|
| 2. | CUSTOMER PROBLEM ANALYSIS |
HINT:
- In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
- Gather as much information as possible for reference. Past malfunctions that seem unrelated may also help in some cases.
-
The following 5 items are important points for problem analysis:
What
Vehicle model, system name
When
Date and time, frequency, whether the problem occurred recently or has been occurring for a long time
Where
Whether the problem occurs at specified location
Under what conditions?
Whether the doors were locked or unlocked, whether the ignition switch was ON, whether the engine was running
How did it happen?
Ask the customer for details about the vehicle operating conditions, environment and malfunction.
|
| 3. | BASIC CHECK |
(a) Measure the auxiliary battery voltage.
Standard Voltage:
11 to 14 V
HINT:
- A simple method to determine whether the auxiliary battery is depleted is to operate the horn.
- If the auxiliary battery voltage is below 11 V, recharge or replace the auxiliary battery.
(b) Check for blown fuses, open or shorted wire harnesses, improperly connected connectors and other problems in areas that can be visually inspected.
(c) Check the connection of each connector and check them for deformation or damage.
|
| 4. | CHECK DTCS AND SAVE VEHICLE CONTROL HISTORY |
(a) Using the GTS, enter the following menus: System Select / Health Check
HINT:
- If DTCs are output, perform troubleshooting for the DTCs.
- Save all output DTCs and vehicle control history.
-
Vehicle control history can also be checked using the Utility menu of the GTS.
Click here
| Result | Proceed to |
|---|---|
| No DTCs are output | A |
| Wireless door lock system and smart key system DTCs are output | B |
| DTCs other than wireless door lock system and smart key system DTCs are output | C |
| B |
 | GO TO DIAGNOSTIC TROUBLE CODE CHART |
| C |
 | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
| 5. | CHECK PROBLEM SYMPTOMS |
(a) Based on the customer problem analysis, check the problem symptoms.
Click here
| Result | Proceed to |
|---|---|
| The problem symptom can be confirmed | A |
| The problem symptom cannot be confirmed | B |
| B |
 | GO TO CHECK FOR INTERMITTENT PROBLEMS |
|
| 6. | CHECK CUSTOMIZE ITEMS |
(a) Use the following customize setting methods to confirm that the smart key system is enabled.
- Using the GTS
- Using manual operation
Check the customize settings.
Click here
(b) Use the following customize setting methods to confirm that the wireless door lock system is enabled.
- Using the GTS
Check the customize settings.
Click here
HINT:
- Even when the smart key system is disabled by a customize setting, the engine can be started by an emergency key operation.
- If the smart key system or wireless door lock control system is disabled, all entry and start functions or wireless functions will not operate.
| Result | Proceed to |
|---|---|
| Wireless door lock control system and smart key system are enabled | A |
| Smart key system is disabled | B |
| Wireless door lock system is disabled | C |
| B |
 | GO TO CUSTOMIZE PARAMETERS |
| C |
 | GO TO CUSTOMIZE PARAMETERS |
|
| 7. | CHECK POWER DOOR LOCK CONTROL SYSTEM |
(a) Check the power door lock control system.
Click here
| Result | Proceed to |
|---|---|
| Power door lock control system operates properly | A |
| Power door lock control system does not operate properly | B |
| B |
 | GO TO POWER DOOR LOCK CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
| 8. | CHECK WIRELESS DOOR LOCK CONTROL SYSTEM |
(a) Check the wireless door lock control system.
Click here
| Result | Proceed to |
|---|---|
| All functions operate properly | A |
| Wireless lock/unlock functions do not operate (entry and start functions also do not operate) | B |
| Wireless lock/unlock functions do not operates (entry and start functions operate) | C |
| Door ajar warning function does not operate | D |
| Answer-back (hazard lights flash) function does not operate | E |
| B |
 | GO TO SMART KEY SYSTEM (for Entry Function) (All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate) |
| C |
 | REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY |
| D |
 | GO TO LIGHTING SYSTEM (Front/Back Door Courtesy Switch Circuit) |
| E |
 | GO TO WIRELESS DOOR LOCK CONTROL SYSTEM (No Answer-Back) |
|
| 9. | CHECK SMART KEY SYSTEM (for Entry Function) |
(a) Check the smart key system (for Entry Function).
Click here
| Result | Proceed to |
|---|---|
| All functions operate properly | A |
| Entry lock/unlock functions do not operate for all doors (wireless function also does not operate) | B |
| Entry lock/unlock functions do not operate for all doors (wireless function operates)) | C |
| Entry lock/unlock functions do not operate only for driver side door | D |
| Entry lock/unlock functions do not operate only for front passenger side door | E |
| Entry lock function does not operate only for driver side door (unlock function operates) | F |
| Entry lock function does not operate only for passenger side door (unlock function operates) | G |
| Entry unlock function does not operate only for driver side door (lock function operates) | H |
| Entry unlock function does not operate only for passenger side door (lock function operates) | I |
| Entry lock/unlock functions do not operate only for back door | J |
| Entry lock function does not operate only for back door (unlock function operates) | K |
| Entry unlock function does not operate only for back door (lock function operates) | L |
| Smart key system exterior warning do not sound | M |
| Smart key system interior warning does not sound | N |
| B |
 | GO TO SMART KEY SYSTEM (for Entry Function) (All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate) |
| C |
 | GO TO SMART KEY SYSTEM (for Entry Function) (All Door Entry Lock/Unlock Functions do not Operate, but Wireless Functions Operate) |
| D |
 | GO TO SMART KEY SYSTEM (for Entry Function) (Driver Side Door Entry Lock and Unlock Functions do not Operate) |
| E |
 | GO TO SMART KEY SYSTEM (for Entry Function) (Front Passenger Side Door Entry Lock and Unlock Functions do not Operate) |
| F |
 | GO TO SMART KEY SYSTEM (for Entry Function) (Driver Side Door Entry Lock Function does not Operate) |
| G |
 | GO TO SMART KEY SYSTEM (for Entry Function) (Front Passenger Side Door Entry Lock Function does not Operate) |
| H |
 | GO TO SMART KEY SYSTEM (for Entry Function) (Driver Side Door Entry Unlock Function does not Operate) |
| I |
 | GO TO SMART KEY SYSTEM (for Entry Function) (Front Passenger Side Door Entry Unlock Function does not Operate) |
| J |
 | GO TO SMART KEY SYSTEM (for Entry Function) (Back Door Entry Unlock Function does not Operate) |
| K |
 | GO TO SMART KEY SYSTEM (for Entry Function) (Back Door Entry Lock and Unlock Functions do not Operate) |
| L |
 | GO TO SMART KEY SYSTEM (for Entry Function) (Back Door Entry Lock Function does not Operate) |
| M |
 | GO TO SMART KEY SYSTEM (for Entry Function) (Entry Exterior Alarm do not Sound) |
| N |
 | GO TO SMART KEY SYSTEM (for Entry Function) (Entry Interior Alarm does not Sound) |
|
| 10. | CHECK SMART KEY SYSTEM (for Start Function) |
(a) Check the smart key system (for Start Function).
Click here
| Result | Proceed to |
|---|---|
| All functions operate properly | A |
| Power source mode changing function does not operate correctly (power source mode cannot be changed to ACC, but can be changed to ON) | B |
| Steering lock function does not operate | C |
| Security indicator light does not blink | D |
| Result | Proceed to |
|---|---|
| Push-button start function does not operate | E |
| Immobiliser function does not operate | F |
| Steering wheel cannot be unlocked | G |
| Power source mode changing function does not operate (power source mode cannot be changed to ACC or ON) | H |
| Power source mode changing function does not operate correctly (power source mode can be changed to ACC, but not ON) | I |
| Immobiliser function does not operate (security indicator light does not turn off) | J |
| B |
 | GO TO SMART KEY SYSTEM (for Start Function) (Power Source Mode does not Change to ON (ACC)) |
| C |
 | GO TO SMART KEY SYSTEM (for Start Function) (Steering Lock does not Lock) |
| D |
 | GO TO SMART KEY SYSTEM (for Start Function) (Security Indicator Light Does not Blink) |
| E |
 | GO TO SMART KEY SYSTEM (for Start Function) (Engine does not Start) |
| F |
 | GO TO SMART KEY SYSTEM (for Start Function) (Immobiliser System does not Operate Properly) |
| G |
 | GO TO SMART KEY SYSTEM (for Start Function) (Unable to Unlock Steering Wheel (Engine cannot Start)) |
| H |
 | GO TO SMART KEY SYSTEM (for Start Function) (Power Source Mode does not Change to ON (IG and ACC)) |
| I |
 | GO TO SMART KEY SYSTEM (for Start Function) (Power Source Mode does not Change to ON (IG)) |
| J |
 | GO TO SMART KEY SYSTEM (for Start Function) (Immobiliser System does not Operate Properly) |
|
| 11. | CHECK ELECTRICAL KEY REGISTRATION FUNCTION |
(a) Check the electrical key registration function.
Click here
| Result | Proceed to |
|---|---|
| Electrical key registration function operates properly | A |
| Cannot register new keys | B |
| Cannot register additional keys | C |
| Additional key registration display is not displayed | D |
| A |
 | USE SIMULATION METHOD TO CHECK |
| B |
 | GO TO SMART KEY SYSTEM (for Start Function) (New Key cannot be Registered) |
| C |
 | GO TO SMART KEY SYSTEM (for Start Function) (Additional Key cannot be Registered) |
| D |
 | GO TO SMART KEY SYSTEM (for Start Function) (New Key Registration Warning Message is not Displayed) |
System Diagram
S..
Check For Intermittent Problems
CHECK FOR INTERMITTENT PROBLEMS NOTICE:
Operation history is stored in the RAM or EEPROM of the certification ECU (smart key ECU assembly). As the cause of a malfunction stored in the RAM will be cleared when the cable is disconnected from the negative (-) battery terminal, do not disconnect the cable from the negative (-) battery terminal before checking and recording are complete...
Other information:
Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Disassembly
DISASSEMBLY 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 front door removal/installation are shown below...
Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Installation
INSTALLATION CAUTION / NOTICE / HINT NOTICE: This procedure includes the installation of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts. Click here PROCEDURE 1. INSTALL REAR ENGINE OIL SEAL (a) Using height adjustment attachments and plate lift attachments, place the engine assembly on a flat level surface...
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Key Suspend Function
If a key is left in the vehicle, the functions of the key left in the vehicle are temporarily suspended to prevent theft of the vehicle.
To restore the functions, press the unlock button on the functions-suspended key in the vehicle.
