Lexus NX: Precaution
PRECAUTION
PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL
NOTICE:
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After the power switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
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When disconnecting and reconnecting the auxiliary battery
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HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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PRECAUTIONS WHEN CHECKING FOR DTCS
(a) When the cable is disconnected from the negative (-) auxiliary battery terminal, the DTCs stored in the steering lock ECU (steering lock actuator assembly) are cleared. Be sure to record any output DTCs immediately.
(b) When using the Techstream with the power switch off, connect the Techstream to the DLC3 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.
PRECAUTIONS WHEN REPLACING STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)
(a) If the steering lock ECU (steering lock actuator assembly) is replaced, be sure to confirm that the steering is unlocked by turning the steering wheel to the left and right before starting the hybrid control system. If the steering is locked for any reason, open and close a door with the power switch off, and then unlock the steering lock by pressing the power switch. This prevents the hybrid control system from starting while the steering is locked.
PRECAUTION FOR REGISTRATION
(a) If replacing any of the following parts, refer to theregistration procedures.
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(1) Certification ECU (Smart key ECU assembly)
(2) Steering lock ECU (Steering lock actuator assembly)
(3) Electrical key transmitter sub-assembly
(4) ID code box (Immobiliser code ECU)
(5) Main body ECU (Multiplex network body ECU)
(6) Hybrid vehicle control ECU
PRECAUTIONS FOR STEERING LOCK / UNLOCK FUNCTION
(a) After turning the power switch off and opening and closing any of the doors, the steering wheel will be locked due to the steering lock function. Operating the power switch again automatically cancels the steering lock function.
(b) To prevent the steering lock motor from overheating, the motor operation may be suspended if the steering is locked and unlocked repeatedly in a short period of time. In this case, refrain from operating the power switch. After about 10 seconds, the steering lock motor will resume functioning.
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Parts Location
PARTS LOCATION ILLUSTRATION *1 NO. 1 ENGINE ROOM RELAY BLOCK - IG2-MAIN RELAY - IG2-MAIN FUSE - STRG LOCK FUSE - - ILLUSTRATION *1 POWER SWITCH *2 INSTRUMENT PANEL JUNCTION BLOC
System Diagram
SYSTEM DIAGRAM Circuit Description Component Outline Steering Lock ECU (Steering Lock Actuator Assembly)
The steering is locked and unlocked by communicating with the certification ECU
System Description
SYSTEM DESCRIPTION UNLOCK OPERATION CONDITIONS FOR STEERING LOCK (a) When the following condition is met, the unlock operation is performed.
The power switch is on (ACC) or on (IG).
HINT: When t
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Installation
INSTALLATION PROCEDURE 1. INSTALL SERVICE PLUG GRIP CAUTION: Wear insulating gloves. NOTICE: Before connecting the service plug, check that no parts and tools remain and that the high voltage terminals and connectors are connected securely. (a) Wear insulated gloves and install the service plug grip
Terminals Of Ecu
TERMINALS OF ECU TERMINAL INSPECTION *a Component without harness connected (Steering Lock ECU (Steering Lock Actuator Assembly)) - - (a) Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Input/Output Wiring Color Terminal De
