How To Proceed With Troubleshooting [10/2018 - 07/2022]: Procedure

WARNING: This page is about a different car, the 2022 Lexus UX 200, 2021 Lexus UX 200, 2020 Lexus UX 200, and 2019 Lexus UX 200. However, it is still accessible from the selected car via links, so may be relevant.

VEHICLE BROUGHT TO WORKSHOP

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.

Result

Proceed to
NEXT

Result:

See step 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 engine switch was on (IG), whether the engine was starting
How did it happen?	Ask the customer for details about the vehicle operating conditions, environment and malfunction. Refer to CUSTOMER PROBLEM ANALYSIS CHECK [10/2018 - 07/2022]

Result

Proceed to
NEXT

Result:

See step 3

BASIC CHECK

Measure the auxiliary battery voltage with the engine switch off.
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.
Check for blown fuses, open or shorted wire harnesses, improperly connected connectors and other problems in areas that can be visually inspected.

Check the connection of each connector and check them for deformation or damage.

Result

Proceed to
NEXT

Result:

See step 4

CHECK DTCS AND SAVE OPERATION HISTORY

Using the Techstream, enter the following menus: System Select / Health Check

HINT:

If DTCs are output, perform troubleshooting for the DTCs.
Save all output DTCs and operation history.
Operation history can also be checked using the Utility menu of the Techstream.
Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2018 - 07/2022]

Result

Result	Proceed to
No DTCs are output	A
Wireless door lock system and smart access system with push-button start DTCs are output	B
DTCs other than wireless door lock system and smart access system with push-button start DTCs are output	C

Result:

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2018 - 07/2022]

Result:

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2018 - 07/2022]

Result:

See step 5

CHECK PROBLEM SYMPTOMS

Based on the customer problem analysis, check the problem symptoms.

Refer to CUSTOMER PROBLEM ANALYSIS CHECK [10/2018 - 07/2022]

Result

Result	Proceed to
The problem symptom can be confirmed	A
The problem symptom cannot be confirmed	B

Result:

GO TO CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2018 - 07/2022]

Result:

See step 6

CHECK CUSTOMIZE ITEMS

Use the following customize setting methods to confirm that the smart access system with push-button start is enabled.
1. Using manual operation
Check the customize settings.

Refer to CUSTOMER PROBLEM ANALYSIS CHECK [10/2018 - 07/2022]

Use the following customize setting methods to confirm that the wireless door lock system is enabled.

Using the Techstream
Using the multi-display

Check the customize settings.

Refer to CUSTOMIZE PARAMETERS [10/2018 - ]

HINT:

Even when the smart access system with push-button start is disabled by a customize setting, the engine can be started by an emergency key operation.
If the smart access system with push-button start or wireless door lock control system is disabled, all entry and start functions or wireless functions will not operate.

Result

Result	Proceed to
Wireless door lock control system and smart access system with push-button start are enabled	A
Smart access system with push-button start is disabled	B
Wireless door lock system is disabled	C

Result:

GO TO CUSTOMIZE PARAMETERS. Refer to CUSTOMIZE PARAMETERS [10/2018 - 07/2022]

Result:

GO TO CUSTOMIZE PARAMETERS. Refer to CUSTOMIZE PARAMETERS [10/2018 - ]

Result:

See step 7

CHECK POWER DOOR LOCK CONTROL SYSTEM

Check the power door lock control system.

Refer to OPERATION CHECK [10/2018 - 07/2022]

Result

Result	Proceed to
Power door lock control system operates properly	A
Power door lock control system does not operate properly	B

Result:

GO TO POWER DOOR LOCK CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 07/2022]

Result:

See step 8

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

Check the wireless door lock control system.

Refer to OPERATION CHECK [10/2018 - 07/2022]

Result

Result	Proceed to
All functions operate properly	A
Wireless lock/unlock functions do not operate (smart access with push-button start functions also do not operate)	B
Wireless lock/unlock functions do not operates (smart access with push-button start functions operate)	C
Only back door open function does not operate (w/ Power Back Door System)	D
Door ajar warning function does not operate (except Back Door)	E
Door ajar warning function does not operate (for Back Door)	F
Answer-back (buzzer sounds and hazard lights flash) function does not operate	G

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (All door entry lock/unlock functions and wireless functions do not operate). Refer to All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate [10/2018 - 08/2021] , or refer to All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate [08/2021 - 07/2022]

Result:

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

Result:

GO TO POWER BACK DOOR SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 07/2022]

Result:

GO TO LIGHTING SYSTEM (Door Courtesy Switch Circuit). Refer to Door Courtesy Switch Circuit [10/2018 - 07/2022]

Result:

GO TO LIGHTING SYSTEM (Back Door Courtesy Switch Circuit). Refer to Back Door Courtesy Switch Circuit [10/2018 - 07/2022]

Result:

GO TO WIRELESS DOOR LOCK CONTROL SYSTEM (No Answer-Back). Refer to No Answer-Back [10/2018 - 07/2022]

Result:

See step 9

CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model)

Check the smart access system with push-button start (for Entry Function, Gasoline Model).

Refer to OPERATION CHECK [10/2018 - 08/2021] , or refer to OPERATION CHECK [08/2021 - 07/2022]

Result

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
Back door lock function/unlock function do not operate	J
Back door lock function does not operate	K
Back door unlock function does not operate	L
Smart access system with push-button start exterior warning and answer-back buzzer do not sound	M
Smart access system with push-button start interior warning does not sound	N
Entry unlock and unlatch functions do not operate using kick sensor*1	O
Touching unlock sensor for certain period of time does not unlock all doors	P

*1: w/ Hands Free Power Back Door

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (All Door Entry Lock/Unlock Functions do not Operate, but Wireless Functions Operate). Refer to All Door Entry Lock/Unlock Functions do not Operate, but Wireless Functions Operate [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Driver Side Door Entry Lock and Unlock Functions do not Operate). Refer to Driver Side Door Entry Lock and Unlock Functions do not Operate [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Front Passenger Side Door Entry Lock and Unlock Functions do not Operate). Refer to Front Passenger Side Door Entry Lock and Unlock Functions do not Operate [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Driver Side Door Entry Lock Function does not Operate). Refer to Driver Side Door Entry Lock Function does not Operate [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Front Passenger Side Door Entry Lock Function does not Operate). Refer to Front Passenger Side Door Entry Lock Function does not Operate [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Driver Side Door Entry Unlock Function does not Operate). Refer to Driver Side Door Entry Unlock Function does not Operate [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Front Passenger Side Door Entry Unlock Function does not Operate). Refer to Front Passenger Side Door Entry Unlock Function does not Operate [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Back Door Entry Lock and Unlock Function do not Operate). Refer to Back Door Entry Lock and Unlock Functions do not Operate [10/2018 - 07/2022]

Result:

SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Back Door Entry Lock Function do not Operate). Refer to Back Door Entry Lock Function does not Operate [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Back Door Entry Unlock Function does not Operate). Refer to Back Door Entry Unlock Function does not Operate [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Entry Exterior Alarm and Answer-back Buzzer do not Sound). Refer to Entry Exterior Alarm and Answer-back Buzzer do not Sound [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Entry Interior Alarm does not Sound). Refer to Entry Interior Alarm does not Sound [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Entry Unlock and Unlatch Functions do not Operate Using Kick Sensor). Refer to Entry Unlock and Unlatch Functions do not Operate Using Kick Sensor [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function, Gasoline Model) (Touching Unlock Sensor for Certain Period of Time does not Unlock All Doors). Refer to Touching Unlock Sensor for Certain Period of Time does not Unlock All Doors [10/2018 - 07/2022]

Result:

See step 10

CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Engine Model)

Check the smart access system with push-button start (for Start Function, Engine Model).

Refer to OPERATION CHECK [10/2018 - 08/2021] , or refer to OPERATION CHECK [08/2021 - 07/2022]

Result

ENGINE WAS STARTED

Result	Proceed to
All functions operate properly	A
Power source mode changing function does not operate correctly (power source mode cannot be changed to on (ACC), but can be changed to on (IG))	B
Steering lock function does not operate	C
Security indicator light does not blink	D

ENGINE WAS NOT START

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 on (ACC) or on (IG))	H
Power source mode changing function does not operate correctly (power source mode can be changed to on (ACC), but not on (IG))	I
Immobiliser function does not operate (security indicator light does not turn off)	J

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) (Power Source Mode does not Change to ON (ACC)). Refer to Power Source Mode does not Change to ON (ACC) [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) (Steering Lock does not Lock). Refer to Steering Lock does not Lock [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) (Security Indicator Light Does not Blink). Refer to Security Indicator Light Does not Blink [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) (Engine does not Start). Refer to Engine does not Start [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) (Immobiliser System does not Operate Properly). Refer to Immobiliser System does not Operate Properly [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) (Unable to Unlock Steering Wheel (Engine cannot Start)). Refer to Unable to Unlock Steering Wheel (Engine cannot Start) [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) (Power Source Mode does not Change to ON (IG and ACC)). Refer to Power Source Mode does not Change to ON (IG and ACC) [10/2018 - 08/2021] , or refer to Power Source Mode does not Change to ON (IG and ACC) [08/2021 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) (Power Source Mode does not Change to ON (IG)). Refer to Power Source Mode does not Change to ON (IG) [10/2018 - 07/2022]

Result:

See step 11

CHECK ELECTRICAL KEY REGISTRATION FUNCTION

Check the electrical key registration function.

Refer to OPERATION CHECK [10/2018 - 08/2021] , or refer to OPERATION CHECK [08/2021 - 07/2022]

Result

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

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) (New Key cannot be Registered). Refer to New Key cannot be Registered [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) (Additional Key cannot be Registered). Refer to Additional Key cannot be Registered [10/2018 - 07/2022]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, Gasoline Model) (New Key Registration Warning Message is not Displayed). Refer to New Key Registration Warning Message is not Displayed [10/2018 - 07/2022]