Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Data List / Active Test

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Suspension / Steering Column / Steering Lock System / Data List / Active Test

DATA LIST / ACTIVE TEST

READ DATA LIST

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

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.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / (desired system) / Data List.

(f) Read the Data List according to the display on the Techstream.

(g) Using the Techstream, confirm the Data List items to help determine the cause of the problem.

NOTICE:

  • The steering lock ECU (steering lock actuator or upper bracket assembly) communicates with the Techstream through the certification ECU (smart key ECU assembly) which uses CAN communication. If the CAN communication system or certification ECU (smart key ECU assembly) is malfunctioning, Data List items may not be normal.
  • When using the Techstream with the engine switch off, connect the Techstream to the vehicle 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 Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Access. 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.
Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Shift P Signal

Shift position (P) signal

ON or OFF

ON: Shift lever in P

OFF: Shift lever not in P
  • Use this item to determine if the shift position switch is malfunctioning.
  • The engine cannot be started when this item is "OFF".

Steering Unlock Switch

State of steering unlock sensor signal output from steering lock ECU (steering lock actuator or upper bracket assembly)

ON or OFF

ON: Steering unlocked

OFF: Steering locked

This item can be used to determine the cause of problems when the steering does not lock or unlock.

HINT:

  • The steering is considered locked when the lock sensor is ON and the unlock sensor is OFF.
  • The steering is considered unlocked when the lock sensor is OFF and the unlock sensor is ON.

Str Lock/Unlock Wait T-Out

Steering lock or unlock malfunction

Yes or No

Yes: Steering lock/unlock timed out (Lock bar stuck, etc.)

No: Steering locks/unlocks normally within specified time

The engine cannot be started when this item is "Yes".
Body Electrical > Smart Access > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

# Codes

Number of DTCs

Min: 0

Max: 255

Number of stored DTCs displayed

-

Immobiliser

State of immobiliser system determined by certification ECU (smart key ECU assembly)

Set or Unset

Set: Immobiliser set (engine start prohibited) (engine switch off)

Unset: Immobiliser unset (engine start permitted) (engine switch on (ACC) or on (IG))
  • When the immobiliser cannot be unset, this item can be used to determine whether the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is part of the problem.
  • The engine cannot be started when this item displays "Set".

HINT:

  • The state of the immobiliser (whether it is set or unset) can be determined through the certification ECU (smart key ECU assembly). If this item displays "Set", the communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) can be determined to be normal.
  • The security indicator light operation is only linked with the state of the immobiliser (set/unset), and is not related to the steering lock operation (lock/unlock), when the immobiliser is set, the security indicator light blinks.

Steering Lock Sleep Cond

Steering lock ECU (steering lock actuator or upper bracket assembly) sleep availability

Yes or No

Yes: Sleep available

No: Sleep not available

-

Steering Lock Start Cond

Steering lock ECU (steering lock actuator or upper bracket assembly) wake up signal status

Yes or No

Yes: Wake up signal sent

No: Wake up signal not sent

-

Engine Start Condition

State of engine start permission signal determined by steering lock ECU (steering lock actuator or upper bracket assembly) sent to certification ECU (smart key ECU assembly)

OK or NG

OK: Engine start permitted

NG: Engine start prohibited
  • When this item displays "OK", the certification ECU (smart key ECU assembly) has received an unlock confirmation signal from the steering lock ECU (steering lock actuator or upper bracket assembly) and has permitted fuel injection and engine combustion.
  • The engine cannot be started when this item displays "NG".

Sensor Value

Record of malfunction of lock or unlock sensor in steering lock ECU (steering lock actuator or upper bracket assembly)

(DTC B2781 is output)

OK or NG(Past)

OK: No record of lock/unlock sensor malfunction in steering lock ECU (steering lock actuator or upper bracket assembly)

NG(Past): Record of lock/unlock sensor in steering lock ECU (steering lock actuator or upper bracket assembly) turning ON at same time exists

When this item displays "NG", the sensor inside the steering lock ECU (steering lock actuator or upper bracket assembly) may be malfunctioning, or there may be a mechanical malfunction.

Power Supply Short

Record of malfunction of signal sent to steering lock motor (steering lock actuator or upper bracket assembly) from certification ECU (smart key ECU assembly) (short circuit)

(DTC B2782 is output)

OK or NG(Past)

OK: No record of malfunction (short circuit)

NG(Past): Record of malfunction (short circuit) exists

This item records malfunctions in the circuit between the certification ECU (smart key ECU assembly) and steering lock motor (steering lock actuator or upper bracket assembly).

Motor Driver Short

Record of malfunction of motor activation circuit in steering lock ECU (steering lock actuator or upper bracket assembly) (short circuit)

(DTC B2781 is output)

OK or NG(Past)

OK: No record of malfunction (short circuit)

NG(Past): Record of malfunction (short circuit) exists

This item records malfunctions in the motor activation circuit inside the steering lock ECU (steering lock actuator or upper bracket assembly) (short circuit).

Lock/Unlock Receive

Reception state of steering lock or unlock request signal from certification ECU (smart key ECU assembly)

Yes or No

Yes: Record of receiving lock or unlock request signal exists

No: No record of receiving lock or unlock request signal

-

Lock Bar Stuck Error

Record of lock bar not properly unlocking after being commanded to unlock for certain amount of time

OK or NG(Past)

OK: No record of stuck lock bar

NG(Past): Record of stuck lock bar exists

-

Engine Start Request

Reception state of engine start permission signal determined by steering lock ECU (steering lock actuator or upper bracket assembly) sent to certification ECU (smart key ECU assembly)

OK or NG

OK: Receiving signal

NG: Not receiving signal
  • When this item displays "OK", the certification ECU (smart key ECU assembly) has received an unlock confirmation signal from the steering lock ECU (steering lock actuator or upper bracket assembly) and has permitted fuel injection and engine combustion.
  • The engine cannot be started when this item displays "NG".

S Code Check

Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU)

OK or NG

OK: Verification result normal

NG: Verification result abnormal

When a malfunction is present:

  • The ID code for the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is not registered or the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning.
  • The steering cannot be locked.
  • The steering cannot be unlocked (the engine cannot be started).

L Code Check

Verification result between ID code box (immobiliser code ECU) and steering lock ECU (steering lock actuator or upper bracket assembly)

OK or NG

OK: Verification result normal

NG: Verification result abnormal

When a malfunction is present:

  • The ID code for the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly) is not registered or the ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly) is malfunctioning.
  • The steering cannot be locked.
  • The steering cannot be unlocked (the engine cannot be started).

Unlock Request Receive

Reception state of steering unlock request signal by certification ECU (smart key ECU assembly) sent to ID code box (immobiliser code ECU)

HINT:

  • The reception state is maintained for 10 seconds.
  • When 10 seconds or more have elapsed after receiving the signal, the item changes to "NG".

OK or NG

OK: Unlock request received within 10 seconds of turning engine switch on (IG) or on (ACC) or starting engine

NG: Except above
  • If the unlock signal has not been received, the engine cannot be started.
  • If this item does not change to "OK" even though the steering unlock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.

Lock Request Receive

Reception state of steering lock request signal by certification ECU (smart key ECU assembly) sent to ID code box (immobiliser code ECU)

HINT:

  • The reception state is maintained for 10 seconds.
  • When 10 seconds or more have elapsed after receiving the signal, the item changes to "NG".

OK or NG

OK: Lock request received within 10 seconds of opening any door with engine switch off and shift lever in P

NG: Except above

If this item does not change to "OK" even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.

S Code Check(Past)

Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) (Past)

OK or NG(Past)

OK: Verification result normal

NG(Past): Verification result abnormal (Past)

-

L Code Check(Past)

Verification result between ID code box (immobiliser code ECU) and steering lock ECU (steering lock actuator or upper bracket assembly) (Past)

OK or NG(Past)

OK: Verification result normal

NG(Past): Verification result abnormal (Past)

-

Steering Lock

State of whether steering lock ECU (steering lock actuator or upper bracket assembly) determined steering is locked

Set or Unset

Set: Steering locked

Unset: Steering unlocked

If this item displays "Unset", the steering is not locked.

Steering Unlock

State of whether steering lock ECU (steering lock actuator or upper bracket assembly) determined steering is unlocked

Set or Unset

Set: Steering unlocked

Unset: Steering locked

If this item displays "Unset", the steering is not unlocked (engine cannot be started).

Engine Start Indicator

Smart warning light

ON or OFF

Customize setting displayed

-

Open in IG2

History of IG2 input of the steering lock ECU (steering lock actuator or upper bracket assembly)

OK or NG(Past)

OK: History of open in IG2 exists

NG(Past): No history of open in IG2 exists

If this item displays "OK", the steering lock ECU (steering lock actuator or upper bracket assembly) has an IG2 input circuit malfunction.

HINT:

Unlock operation conditions for the steering lock:

When the following condition is met, the unlock operation is performed:

The engine switch is on (ACC) or on (IG).

  • When the engine switch is turned on (ACC) or on (IG) and the key and certification ECU (smart key ECU assembly) are verified, the steering is unlocked.

When any of the following conditions are met, key verification is performed.

  • The brake pedal is depressed so that the engine can be started.
  • 30 seconds have elapsed after opening and closing a door.
  • The engine switch is pressed.

Key verification occurs when the code emitted from the key and the code stored in the certification ECU (smart key ECU assembly) are compared to check that they match.

Certification ECU (smart key ECU assembly) verification occurs when the S code and L code are verified while the engine is being started or the engine switch is being pushed. The ID code box (immobiliser code ECU) uses the S code to determine whether the certification ECU (smart key ECU assembly) is authorized. The steering lock ECU (steering lock actuator or upper bracket assembly) uses the L code to determine whether the ID code box (immobiliser code ECU) is authorized.

Lock operation conditions for the steering:

When the following conditions are met and the certification ECU (smart key ECU assembly) has been verified, the lock operation is performed.

  • The engine switch is off.
  • The shift lever is in P.
  • A door is opened or a door lock operation (door lock, wireless door lock or key-linked lock) is performed.

HINT:

The following example shows the behavior of various Data List items when the shift lever is in P, the brake pedal is not depressed, the vehicle is normal and the power source mode changes.

Get into the vehicle while carrying the key. With the engine switch off, the shift lever in P and all the doors closed, perform the following procedures and check the power source mode.

HINT:

*1: Without depressing the brake pedal, press the engine switch and check that the power source mode changes to on (ACC).

*2: Without depressing the brake pedal, press the engine switch and check that the power source mode changes to on (IG).

*3: Press the engine switch and check that the power source mode changes to off.

*4: Release the brake pedal, open the driver door and check that the steering locks.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FL Door Courtesy SW

Front door courtesy light switch assembly LH

ON or OFF

ON: Front door LH open

OFF: Front door LH closed

If this item does not change according to the actual state of the driver door, there is a malfunction in the door courtesy light switch or related part.

ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / (desired system) / Active Test.

(f) According to the display on the Techstream, perform the Active Test.

Body Electrical > Power Source Control > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

P Supply for Steering Lock

Certification ECU (smart key ECU assembly)

OFF/ON

HINT:

OFF: Power is not supplied

ON: Power is supplied

When performing this Active Test, make sure the following condition is met:

The engine switch is on (IG).
    IG2 Signal Malfunction (B2788)
    DESCRIPTION This DTC is stored when the steering lock ECU (steering lock actuator or upper bracket assembly) detects an IG2 power supply malfunction. HINT: The steering lock ECU (steering lock actuato ...

    Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION (a) The steering lock ECU (steering lock actuator or upper bracket assembly) stores DTCs when a malfunction occurs in the system. These DTCs can be confirmed by using the ...

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