How To Proceed With Troubleshooting [10/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus LS 500h. However, it is still accessible from the selected car via links, so may be relevant.

VEHICLE BROUGHT TO WORKSHOP

Confirm how vehicle was brought to workshop.

Vehicle was driven
Vehicle was towed

HINT:

The malfunction location 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, in order to check the problem symptoms accurately and judge correctly, avoid having any preconceptions. 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 place
Under what conditions?	Whether the doors were locked or unlocked, whether the power switch was on (IG), whether the hybrid control system was starting
How did it happen?	Ask the customer for details about the vehicle operating conditions, environment and malfunction.*

*: Be sure to ask the customer in detail about the following points concerning the vehicle operating conditions, environment and problem, and then check for DTCs.
1. If the entry unlock function does not operate.
2. If there is no power even when the power switch is pressed (does not turn on (ACC)).
3. If the entry lock function does not operate.
4. If the entry lock/unlock function does not operate for all doors.
5. If both the entry lock and unlock functions do not operate.
6. If the wireless lock and unlock functions do not operate.
7. If the hybrid control system does not start with the push-button start function.
8. If a hybrid control system start was attempted by holding the electrical key transmitter sub-assembly near the power switch and then pressing the power switch.
9. If the interior warning buzzers do not sound.
10. If the outside warning buzzers do not sound.
If it is suspected that wave interference is likely, be sure to ask the customer in detail about the following points concerning the vehicle operating conditions, environment and problem.
1. Specific locations where the system does not operate (such as near TV towers, large video displays, wireless garage door opener systems, wireless security cameras, home security systems, etc.).
2. Specific times when the system does not operate.
3. If the symptoms occurred immediately after purchase or only recently.
4. If the system does not operate only when near specific vehicles (there may be wave interference from the wireless systems of other vehicles).
5. If the system operates intermittently.
6. If the electrical key transmitter sub-assembly is bundled together with other items.
7. If the electrical key transmitter sub-assembly is carried together with other electronic devices, such as cell phones, personal computers, portable music players, other electrical key transmitter sub-assemblies, etc. (keep the electrical key transmitter sub-assembly at least 0.1 m (0.328 ft.) away from such items).
8. Where the electrical key transmitter sub-assembly is being kept when not in use: If the electrical key transmitter sub-assembly is being placed within 1 m (3.28 ft.) of items such as TVs, DVD recorders, induction cookers, rice cookers, dishwashers, modems, cell phones, personal computers, microwave ovens, desk or floor lamps, cordless telephones, etc.
9. If there are electronic devices that transmit radio waves placed in the vehicle.
10. When the transmitter battery was last replaced. The transmitter battery can be checked roughly using the "Key Low Battery" item in the Data List.
  Refer to DATA LIST / ACTIVE TEST [10/2023 - ]
11. If the customer installed any optional components (theft deterrent devices, wireless fog lights, etc.) to the vehicle.

Result

Proceed to
NEXT

Result:

See step 3

BASIC CHECK

Measure the auxiliary battery voltage.
Standard voltage

11 to 14 V (power switch off)

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 connections 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 and: Health Check

HINT:

If DTCs are output, first 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 [10/2023 - ]

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 [10/2023 - ]

Result:

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer To DIAGNOSTIC TROUBLE CODE CHART [10/2023 - ]

Result:

See step 5

CHECK PROBLEM SYMPTOMS

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

Refer to PROBLEM SYMPTOMS TABLE [10/2023 - ]

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 [10/2023 - ]

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 on.
- Check setting using Techstream
- Check setting on multi-display
- Check setting by manual operation
Check for the customize setting.

Refer to CUSTOMIZE PARAMETERS [10/2023 - ]
Use the following customize setting methods to confirm that the wireless door lock system is on.
- Check setting using Techstream
- Check setting by manual operation
Check for the customize setting.

Refer to CUSTOMER PROBLEM ANALYSIS CHECK [10/2023 - ]

Use the following customize setting methods to confirm that the power trunk lid system is on.

Check setting using Techstream
Check setting on multi-display

Check for the customize setting.

Refer to CUSTOMIZE PARAMETERS [10/2023 - ]

HINT:

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

Result

Result	Proceed to
Wireless door lock system and smart access system with push-button start are on	A
Smart access system with push-button start is off	B
Wireless door lock system is off	C
Power trunk lid system is off	D

Result:

GO TO CUSTOMIZE PARAMETERS. Refer to CUSTOMIZE PARAMETERS [10/2023 - ]

Result:

GO TO CUSTOMIZE PARAMETERS. Refer to CUSTOMIZE PARAMETERS [10/2023 - ]

Result:

GO TO CUSTOMIZE PARAMETERS. Refer to CUSTOMIZE PARAMETERS [10/2023 - ]

Result:

See step 7

CHECK POWER DOOR LOCK CONTROL SYSTEM

Check the power door lock system.

Refer to OPERATION CHECK [10/2023 - ]

Result

Result	Proceed to
Power door lock system operate properly	A
Power door lock 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 [10/2023 - ]

Result:

See step 8

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

Check the wireless door lock system.

Refer to OPERATION CHECK [10/2023 - ]

Result

Result	Proceed to
All functions operate properly	A
Wireless lock/unlock function does not operate (entry and start function also does not operate)	B
Wireless lock/unlock function does not operate (entry and start function operates)	C
Only luggage door open function does not operate	D
Door ajar warning function does not operate	E
Answer-back (buzzer sounds and hazard lights flash) function does not operate	F

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (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 [10/2023 - ]

Result:

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

Result:

GO TO POWER TRUNK LID SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

Result:

GO TO LIGHTING SYSTEM (Door Courtesy Switch Circuit). Refer to Door Courtesy Switch Circuit [10/2023 - ]

Result:

GO TO WIRELESS DOOR LOCK CONTROL SYSTEM (No Answer-Back). Refer to No Answer-Back [10/2023 - ]

Result:

See step 9

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

Check the smart access system with push-button start.

Refer to OPERATION CHECK [10/2023 - ]

Result

Result	Proceed to
All functions operate properly	A
Entry lock/unlock function does not operate from all doors (wireless function also does not operate)	B
Entry lock/unlock function does not operate from all doors (wireless function operates))	C
Entry lock function/unlock function do not operate only from driver side door	D
Entry lock function/unlock function do not operate only from front passenger side door	E
Entry lock function/unlock function do not operate only from rear door LH	F
Entry lock function/unlock function do not operate only from rear door RH	G
Entry lock function does not operate only from driver side door (unlock operates)	H
Entry lock function does not operate only from passenger side door (unlock operates)	I
Entry lock function does not operate only from rear door LH (unlock operates)	J
Entry lock function does not operate only from rear door RH (unlock operates)	K
Entry unlock function does not operate only from driver side door (lock operates)	L
Entry unlock function does not operate only from passenger side door (lock operates)	M
Entry unlock function does not operate only from rear door LH (lock operates)	N
Entry unlock function does not operate only from rear door RH (lock operates)	O
Luggage door open function does not operate	P
Luggage lock-in prevention function does not operate (Luggage compartment door does not open)	Q
Smart access system with push-button start exterior warning and answer-back buzzer do not sound	R
Smart access system with push-button start interior warning does not sound	S
Entry unlock and unlatch functions do not operate using kick sensor	T

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (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 [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Driver Side Door Entry Lock and Unlock Functions do not Operate). Refer to Driver Side Door Entry Lock and Unlock Functions do not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (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 [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Rear Door LH Entry Lock and Unlock Functions do not Operate). Refer to Rear Door LH Entry Lock and Unlock Functions do not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Rear Door RH Entry Lock and Unlock Functions do not Operate). Refer to Rear Door RH Entry Lock and Unlock Functions do not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Driver Side Door Entry Lock Function does not Operate). Refer to Driver Side Door Entry Lock Function does not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Front Passenger Side Door Entry Lock Function does not Operate). Refer to Front Passenger Side Door Entry Lock Function does not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Rear Door LH Entry Lock Function does not Operate). Refer to Rear Door LH Entry Lock Function does not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Rear Door RH Entry Lock Function does not Operate). Refer to Rear Door RH Entry Lock Function does not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Driver Side Door Entry Unlock Function does not Operate). Refer to Driver Side Door Entry Unlock Function does not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Front Passenger Side Door Entry Unlock Function does not Operate). Refer to Front Passenger Side Door Entry Unlock Function does not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Rear Door LH Entry Unlock Function does not Operate). Refer to Rear Door LH Entry Unlock Function does not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Rear Door RH Entry Unlock Function does not Operate). Refer to Rear Door RH Entry Unlock Function does not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Luggage Compartment Door Entry Unlock Function does not Operate when Key is Outside Luggage Compartment). Refer to Luggage Compartment Door Entry Unlock Function does not Operate when Key is Outside Luggage Compartment [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Key Luggage Compartment Lock-in Prevention Function does not Operate). Refer to Key Luggage Compartment Lock-in Prevention Function does not Operate [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Entry Exterior Alarm and Answer-back Buzzer do not Sound). Refer to Entry Exterior Alarm and Answer-back Buzzer do not Sound [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Entry Interior Alarm does not Sound). Refer to Entry Interior Alarm does not Sound [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) (Entry Unlock and Unlatch Functions do not Operate Using Kick Sensor). Refer to Entry Unlock and Unlatch Functions do not Operate Using Kick Sensor [10/2023 - ]

Result:

See step 10

INSPECT SMART ACCESS SYSTEM WITH PUSH-BUTTON START

Check the smart access system with push-button start.

Refer to OPERATION CHECK [10/2023 - ]

Result

HYBRID CONTROL SYSTEM WAS STARTED

Result	Proceed to
All functions operate properly	A
Power source mode changing function does not operate (power source mode does not change to on (ACC), but changes to on (IG))	B
Security indicator light does not blink	C

HYBRID CONTROL SYSTEM WAS NOT STARTED

Result	Proceed to
Push-button start function does not operate	D
Immobiliser function does not operate	E
Power source mode changing function does not operate (does not change to on (ACC) or on (IG))	F
Power source mode changing function does not operate (changes to on (ACC), but not on (IG))	G
Immobiliser function does not operate (Security Indicator light does not turn off)	H

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (Power Source Mode does not Change to ON (ACC)). Refer to Power Source Mode does not Change to ON (ACC) [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (Security Indicator Light Does not Blink). Refer to Security Indicator Light Does not Blink [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (Power Source Mode does not Change to ON (READY)). Refer to Power Source Mode does not Change to ON (READY) [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (Immobiliser System does not Operate Properly). Refer to Immobiliser System does not Operate Properly [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (Power Source Mode does not Change to ON (IG and ACC)). Refer to Power Source Mode does not Change to ON (IG and ACC) [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (Power Source Mode does not Change to ON (IG)). Refer to Power Source Mode does not Change to ON (IG) [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (Immobiliser System does not Operate Properly). Refer to Immobiliser System does not Operate Properly [10/2023 - ]

Result:

See step 11

INSPECT ELECTRICAL KEY REGISTRATION FUNCTION

Check the electrical key registration function for malfunctions.

Refer to the Registration.

Refer to REGISTRATION [10/2023 - ]

Result

Result	Proceed to
All functions operate properly	A
Cannot register new keys	B
Cannot register additional keys	C
Additional key registration display is not displayed	D
"Key Battery Low Replace Key Battery" is Displayed on the Multi-information Display	E

Result:

CHECK FOR USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (New Key cannot be Registered). Refer to New Key cannot be Registered [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (Additional Key cannot be Registered). Refer to Additional Key cannot be Registered [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (New Key Registration Warning Message is not Displayed). Refer to New Key Registration Warning Message is not Displayed [10/2023 - ]

Result:

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) ("Key Battery Low Replace Key Battery" is Displayed on the Multi-information Display). Refer to "Key Battery Low Replace Key Battery" is Displayed on the Multi-information Display [10/2023 - ]