Lexus NX: 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 power switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / (desired system) / Data List.
(f) According to the display on the Techstream, read the Data List.
(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 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 power 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 vehicle type 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.
| 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 whether the shift lever position switch (P) is malfunctioning. |
| Steering Unlock Switch | State of steering unlock sensor signal output from steering lock ECU (steering lock actuator assembly) | ON or OFF | ON: Steering unlocked OFF: Steering locked |
|
| 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 | When the hybrid control system cannot be started due to a steering lock or unlock malfunction, Yes is displayed. |
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| # Codes | Number of trouble codes | 0 to 255 | 0 | - |
| Immobiliser | Immobiliser system status determined by certification ECU (smart key ECU assembly) | Set or Unset | Set: Immobiliser set (hybrid control system start prohibited) (power switch off) Unset: Immobiliser unset (hybrid control system start permitted) (power switch on (ACC) or on (IG)) | The hybrid control system cannot be started when Set is displayed. HINT:
|
| Steering Lock Sleep Cond | Steering lock ECU (steering lock actuator assembly) sleep availability | Yes or No | Yes: Sleep available No: Sleep not available | - |
| Steering Lock Start Cond | Steering lock ECU (steering lock actuator assembly) wake up signal status | Yes or No | Yes: Wake up signal sent No: Wake up signal not sent | - |
| Engine Start Condition | Status of hybrid control system start permission signal determined by steering lock ECU (steering lock actuator assembly) and sent to certification ECU (smart key ECU assembly) | OK or NG | OK: Hybrid control system start permitted NG: Hybrid control system start prohibited |
|
| Sensor Value | History of signal error (short) sent from certification ECU (smart key ECU assembly) to steering lock ECU (steering lock actuator assembly) (DTC B2781 is output) | OK or NG(Past) | OK: History of malfunction for the lock or unlock sensor in the steering lock ECU (steering lock actuator assembly) does not exist. NG(Past): History of both the lock and unlock sensors in the steering lock ECU (steering lock actuator 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 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 assembly) (DTC B2782 is output) | 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 assembly). |
| Motor Driver Short | History of malfunction (short) in steering lock ECU (steering lock actuator assembly) motor circuit (DTC B2781 is output) | 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 assembly). |
| Lock/Unlock Receive | History of receiving an unlock request signal | Yes or No | Yes: History of receiving an unlock request signal exists No: History of receiving an unlock request signal does not exist | - |
| 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 (hybrid control system 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 |
|
| 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:
|
| L Code Check | Verification result between ID code box (immobiliser code ECU) and steering lock ECU (steering lock actuator assembly) | OK or NG | OK: Verification result normal NG: Verification result abnormal | When NG is displayed:
|
| Unlock Request Receive | Unlock request signal received state | OK or NG | OK: Unlock request signal received within 10 seconds of power switch on (IG) or on (ACC), or of a hybrid control system start operation being performed NG: Power switch not turned on (IG) or on (ACC), and hybrid control system start operation not performed |
|
| Lock Request Receive | Lock request signal received state | OK or NG | OK: Lock request signal received for 10 seconds of any of the doors being opened with shift lever in P and power 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 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 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 assembly) unlock confirmation status | Unset or Set | Unset: Unlock not confirmed Set: Unlock confirmed | When Unset is displayed, the steering is not unlocked (the hybrid control system cannot be started). |
| Engine Start Indicator | Smart warning light | OFF or ON | Customization status displayed | - |
| Open in IG2 | History of IG2 input of the steering lock ECU (steering lock actuator assembly) | OK or NG(Past) | OK: History of open in IG2 exists NG(Past): No history of open in IG2 exists | When OK is displayed, the steering lock ECU (steering lock actuator 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 power switch is on (ACC) or on (IG).
- When the power 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 hybrid control system can be started.
- 30 seconds have elapsed after opening and closing a door.
- The power 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 hybrid control system is being started or the power 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 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 power 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 power 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 power switch and check that the power source mode changes to on (ACC).
*2: Without depressing the brake pedal, press the power switch and check that the power source mode changes to on (IG).
*3: Press the power 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 power switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / (desired system) / 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 power switch is on (IG). |
READ NEXT:
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Steering Lock System DTC No. Detection Item Link B2781 Open / Short in Steering Lock ECU B2782 Power Source Control ECU Malfunction B2788
Open / Short in Steering Lock ECU (B2781)
DESCRIPTION The steering lock ECU and steering lock motor are built into the steering lock actuator assembly. The steering lock ECU (steering lock actuator assembly) detects whether the steering lock
Power Source Control ECU Malfunction (B2782)
DESCRIPTION The certification ECU (smart key ECU assembly) has a power source mode switching function. This DTC is stored when the IGE input (the steering lock motor activation permission signal) sent
SEE MORE:
Terminals Of Ecu
TERMINALS OF ECU TERMINALS OF ECU *a Component without harness connected (Skid Control ECU (Brake Booster with Master Cylinder Assembly)) - - Terminal No. (Symbol) Terminal Description 1 (MRI1) Motor power supply input 1 2 (MRI2) Motor power supply input 2 3 (STPO)
Freeze Frame Data
FREEZE FRAME DATA DESCRIPTION (a) Whenever a front radar sensor system DTC is stored, the millimeter wave radar sensor assembly stores the current vehicle state as Freeze Frame Data. CHECK FREEZE FRAME DATA (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techs
