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

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Start Function) / Data List / Active Test

DATA LIST / ACTIVE TEST

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) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

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

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Shift P Signal

Shift position P

OFF or ON

OFF: Shift lever not in P

ON: Shift lever in P

Use this item to determine if the park/neutral position switch assembly is malfunctioning.

Steering Unlock Switch

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

OFF or ON

OFF: Steering locked

ON: Steering unlocked
  • When the shift lever is in P and the engine switch is off, if any door is opened or closed, the steering is locked.
  • When the electrical key transmitter sub-assembly is in the cabin and the engine switch is turned on (ACC) or on (IG), the steering unlocks.
  • The engine cannot be started when the steering unlock signal is off.

Stop Light Switch1

State of brake pedal

OFF or ON

OFF: Brake pedal released

ON: Brake pedal depressed
  • Use this item to determine if the stop light switch assembly is malfunctioning.
  • The engine cannot be started when this item is OFF.
  • If the stop light switch assembly is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.

Start Switch1

Engine switch 1 status

OFF or ON

OFF: Engine switch not pressed

ON: Engine switch pressed
  • If the engine switch is pressed for a short time, the display may not change.
  • Use this item to determine if the engine switch input signal is malfunctioning.

Start Switch2

Engine switch 2 status

OFF or ON

OFF: Engine switch not pressed

ON: Engine switch pressed
  • Backup for engine switch 1. However, when the engine switch is pressed and held, the control functions only when both engine switch 1 and 2 are normal.
  • Behaves the same way as engine switch 1.

Neutral SW/ Clutch SW

Shift position (P and N)

OFF or ON

OFF: Shift lever in any position other than P or N

ON: Shift lever in P or N
  • Use this item to determine if the park/neutral position switch assembly is malfunctioning.
  • When the engine cannot be started due to a park/neutral position switch assembly malfunction, OFF is displayed.

Latch Circuit

Status of IG related backup circuits

OFF or ON

OFF: Engine switch off

ON: Engine switch on (IG)
  • Operates in almost the same manner as the IG relay.
  • When the engine switch is on (ACC), OFF is displayed.

Starter Request Signal

Engine start request signal status

OFF or ON

OFF: The engine switch is not pressed

ON: With the shift lever in P and the brake pedal depressed, the engine switch is pressed and held
  • When the engine cannot be started due to a start request signal malfunction, OFF is displayed.
  • When the engine switch is pressed, the duration of time that ON is displayed will be extremely short. As such, the engine switch needs to be pressed and held for a certain period of time.

ACC Relay Monitor

ACC relay activation

OFF or ON

OFF: Engine switch off

ON: Engine switch on (ACC)
  • When the engine switch is on (IG), ON is displayed.
  • While the engine is cranking, OFF is displayed.

Engine Condition

Engine state

Stop or Run

Stop: Engine stopped

Run: Engine running

-

Vehicle Speed Signal

Vehicle being driven or stopped

Stop or Run

Stop: Vehicle stopped

Run: Vehicle being driven at 5 km/h (3 mph) or more

-

Power Supply Condition

Power supply state

All OFF, ACC ON, IG ON or ST ON

All OFF: Engine switch off (ACC and IG)

ACC ON: Engine switch on (ACC)

IG ON: Engine switch on (IG)

ST ON: Sending engine start request signal

-

Powertrain Type

Vehicle identification

HV-AT, Cnv-MT, Cnv-AT, Cnv-MMT, S&S-MT, S&S-AT or S&S-MMT

Cnv-AT: Conventional A/T model (w/o hybrid system)

-

Starter SW Sig Mismatch

Engine switch signal 1 and 2 do not match

No or Yes

No: Engine switch normal

Yes: Engine switch malfunction (Engine switch signal 1 and 2 do not match)

Even when Yes is displayed, the engine can be started. However, emergency stop while driving by pressing and holding the engine switch, and if the brake system malfunctioning, emergency start by pressing and holding the engine switch cannot be performed.

Park Signal Mismatch

P position signal malfunction

No or Yes

No: Signal normal

Yes: Signal malfunction (signals via CAN communication and direct line do not match)

Even when Yes is displayed, it is still possible to turn the engine switch off (the power source mode will not be stuck in on (ACC) or on (IG)).

Str Lock/Unlock Wait T-Out

Steering lock or unlock malfunction

No or Yes

No: Lock and unlock normal

Yes: Lock or unlock malfunction (e.g. steering lock is stuck etc.)

When the engine cannot be started due to a steering lock or unlock malfunction, Yes is displayed.

Key Certif Wait T-Out

Key verification malfunction

No or Yes

No: Verification normal

Yes: Verification error (Detected due to the electrical key transmitter sub-assembly ID code and the ID code stored in the certification ECU (smart key ECU assembly) not matching)

When the engine cannot be started due to a key verification error, Yes is displayed.

IG Circuit

IG relay coil circuit malfunction

OK or NG

OK: Circuit normal

NG: Circuit malfunctioning
  • Use this item to determine if the IG relay is malfunctioning.
  • When the engine cannot be started due to an IG relay malfunction, NG is displayed.

IG Relay Monitor (Outside)

IG relay coil voltage monitor status

OFF or ON

OFF: Engine switch off

ON: Engine switch on (IG)
  • Use this item to determine if the IG relay is malfunctioning.
  • When the engine switch is on (ACC), OFF is displayed.

IG Relay Monitor (Inside)

IG relay activation

OFF or ON

OFF: Engine switch off

ON: Engine switch on (IG)
  • Use this item to determine if the IG relay is malfunctioning.
  • When the engine switch is on (ACC), OFF is displayed.

Number of Diagnosis Code

Number of DTCs

0 to 255

-

-
To check if the Data List display changes, get into the vehicle while carrying an electrical key transmitter sub-assembly and perform the following operations with the engine switch off and the shift lever in P.

HINT:

*1: Press the engine switch with the brake pedal released and check that the engine switch turns on (ACC).

*2: Press the engine switch with the brake pedal released and check that the engine switch turns on (IG).

*3: Depress the brake pedal (stop light switch assembly is on).

*4: Press the engine switch with the brake pedal depressed and check that the engine starts.

*5: Press the engine switch with the brake pedal depressed and check that the engine switch turns off.

*6: Release the brake pedal.

*7: Open a door.

Body Electrical > Smart Access > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Key Low Battery

Transmitter battery depleted

No or Yes

No: Transmitter battery not depleted

Yes: Transmitter battery depleted

The electrical key transmitter sub-assembly sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. "Yes" is displayed for the Data List item "Key Low Battery" when this voltage information indicates 2.2 V or less. This Data List item should be checked when the electrical key transmitter sub-assembly is at room temperature (example: at -20°C (-4°F), "Yes" may be displayed even if the transmitter battery is new).

# Codes

Number of DTCs

0 to 255

-

-

Immobiliser

Immobiliser system status 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))

The engine cannot be started when Set is displayed.

HINT:

  • The security indicator light blinks when Set is displayed.
  • The security indicator light is linked with set/unset of the immobiliser and not linked with lock/unlock of the steering.

Steering Lock Sleep Cond

Steering lock ECU sleep availability

No or Yes

No: Sleep not available

Yes: Sleep available

-

Steering Lock Start Cond

Steering lock ECU wake up signal status

No or Yes

No: Wake up signal not sent

Yes: Wake up signal sent

-

Engine Start Condition

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

NG or OK

NG: Engine start prohibited

OK: Engine start permitted
  • When OK is displayed, the certification ECU (smart key ECU assembly) receives an unlock confirmation signal from the steering lock ECU (steering lock actuator or upper bracket assembly) and makes fuel injection and engine starting possible.
  • The engine cannot be started when NG is displayed.

Sensor Value

History of malfunction of position sensor in steering lock ECU (steering lock actuator or upper bracket assembly) (DTC B2781 is stored)

OK or NG(Past)

OK: History of malfunction for the lock or unlock sensor in the steering lock ECU (steering lock actuator or upper bracket assembly) does not exist.

NG(Past): History of both the lock and unlock sensors in the steering lock ECU (steering lock actuator or upper bracket assembly) being on exists. (Under normal operation, neither sensor is on.)

When NG(Past) is displayed, either the position sensor in the steering lock ECU (steering lock actuator or upper bracket assembly) or the assembly itself may be malfunctioning.

Power Supply Short

History of signal error (short) sent from certification ECU (smart key ECU assembly) to steering lock ECU (steering lock actuator or upper bracket assembly) (DTC B2782 is stored)

OK or NG(Past)

OK: History of motor power source short does not exist

NG(Past): History of motor power source short exists

This item displays history of a malfunction in the circuit between the certification ECU (smart key ECU assembly) and the steering lock ECU (steering lock actuator or upper bracket assembly).

Motor Driver Short

History of malfunction (short) in steering lock ECU (steering lock actuator or upper bracket assembly) motor circuit (DTC B2781 is stored)

OK or NG(Past)

OK: History of short in the motor circuit does not exist

NG(Past): History of short in the motor circuit exists

This item displays history of a malfunction in the steering lock motor circuit in the steering lock ECU (steering lock actuator or upper bracket assembly).

Lock/Unlock Receive

History of receiving an unlock request signal

No or Yes

No: History of receiving an unlock request signal does not exist

Yes: History of receiving an unlock request signal exists

-

Lock Bar Stuck Error

History of steering not being able to unlock properly when steering lock operates for a certain period of time

OK or NG(Past)

OK: History of steering lock being stuck does not exist

NG(Past): History of steering lock being stuck exists

-

Engine Start Request

Immobiliser unset (engine start permitted) signal from certification ECU (smart key ECU assembly) to ID code box (immobiliser code ECU) received state

OK or NG

OK: Signal received

NG: Signal not received
  • The ID code box (immobiliser code ECU) receives the immobiliser unset (engine start permitted) signal from the certification ECU (smart key ECU assembly) and permits fuel injection and ignition when OK is displayed.
  • The engine cannot be started when NG is displayed.

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 NG is displayed:

  • 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 NG is displayed:

  • 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

Unlock request signal received state

OK or NG

OK: Unlock request signal received within 10 seconds of engine switch being turned on (IG) or on (ACC) or of an engine start operation being performed

NG: Engine switch not turned on (IG) or on (ACC) and engine start operation not being performed
  • The engine cannot be started when an unlock request signal cannot be received.
  • If OK is not displayed even though the steering unlock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.

Lock Request Receive

Lock request signal received state

OK or NG

OK: Lock request signal received within 10 seconds of any of the doors being opened with shift lever in P and engine switch off.

NG: Except above

If OK is not displayed even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.

S Code Check(Past)

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

OK or NG(Past)

OK: History of abnormal verification result does not exist

NG(Past): History of abnormal verification result exists

-

L Code Check(Past)

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

OK or NG(Past)

OK: History of abnormal verification result does not exist

NG(Past): History of abnormal verification result exists

-

Steering Lock

Steering lock ECU (steering lock actuator or upper bracket assembly) lock confirmation status

Unset or Set

Unset: Lock not confirmed

Set: Lock confirmed

When Unset is displayed, the steering is not locked.

Steering Unlock

Steering lock ECU (steering lock actuator or upper bracket assembly) unlock confirmation status

Unset or Set

Unset: Unlock not confirmed

Set: Unlock confirmed

When Unset is displayed, the steering is not unlocked (the engine cannot be started).

Engine Start Indicator

Key indicator display

OFF or ON

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 terminal circuit exists

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

When OK is displayed, the steering lock ECU (steering lock actuator or upper bracket assembly) has an IG2 input circuit malfunction.
To check if the Data List display changes, get into the vehicle while carrying an electrical key transmitter sub-assembly and perform the following operations with the engine switch off and the shift lever in P.

HINT:

*1: Press the engine switch with the brake pedal released and check that the engine switch turns on (ACC).

*2: Press the engine switch with the brake pedal released and check that the engine switch turns on (IG).

*3: Press the engine switch and check that the engine switch turns off.

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

Body Electrical > Starting Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Starter SW

Starter operation request

OFF or ON

OFF: Starter operation not requested

ON: Starter operation requested

When OFF is displayed, the engine will not crank.

Shift Position P or N

Park/Neutral position switch status

OFF or ON

OFF: Shift lever not in P or N

ON: Shift lever in P or N

When OFF is displayed, the engine will not crank.

Starter Relay

Starter relay voltage monitor

OFF or ON

OFF: ST relay off

ON: ST relay on

When OFF is displayed the engine cannot be cranked.

Starting Control SW

Starter request signal monitor

OFF or ON

OFF: Starting control switch off

ON: Starting control switch on

When OFF is displayed, the engine cannot be cranked.

Ignition

IG2 status

OFF or ON

OFF: IG2 relay off

ON: IG2 relay on

-

Engine Speed

Engine speed

0 to 16383 rpm

Fluctuates in accordance with actual engine speed

-

Number of DTCs

Number of DTCs

0 to 255

-

-

HINT:

*: With the engine switch on (IG), the shift lever in P and the brake pedal depressed, press the engine switch and check that the engine starts.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Vehicle Speed Meter

Vehicle speed

Min.: 0, Max.: 255

Almost same as actual vehicle speed (Speedometer tester)

-
Powertrain > Engine > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light SW

Brake pedal signal

OFF or ON

OFF: Brake pedal released

ON: Brake pedal depressed

-

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) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

(e) Perform Active Test according to the display on the Techstream.

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).
Body Electrical > Smart Access > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Power/Engine SW Light

Engine switch light

OFF/ON

When performing this Active Test, make sure the following conditions are met:

The engine switch illumination is off (15 seconds or more have elapsed since it turned off) and the engine switch is on (ACC) or on (IG), or the engine is running.
Body Electrical > Starting Control > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Activate the Starter Relay

ST relay

OFF/ON

When performing this Active Test, make sure the following conditions are met:

The electrical key transmitter sub-assembly is in the cabin and the engine is stopped.
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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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