Lexus NX: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
- If the problem only occurs in certain locations or at certain times of day, check for wave interference.
- If optional components are installed, check for wave interference from the components.
| Symptom | Suspected Area | Link |
|---|---|---|
| Security indicator light does not blink | Proceed to "Security Indicator Light Does not Blink" | |
| Immobiliser system does not operate properly | Proceed to "Immobiliser System does not Operate Properly" | |
| Hybrid control system cannot be started*1 | Certification ECU (Smart key ECU assembly) | |
| Hybrid vehicle control ECU | | |
| Hybrid control system | | |
| Power source mode cannot be changed*1 | Power switch | |
| Certification ECU (Smart key ECU assembly) | | |
| Steering lock lock/unlock not possible*2 | Steering lock ECU (Steering lock actuator assembly) | |
| Hybrid control system cannot be started by Lexus Enform Remote (Hybrid control system can be started by push-button start function)*3 | Proceed to "Remote Engine Starter does not Operate" | |
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- *1: Refer to Problem Symptoms Table for Smart Access System with Push-button Start (for Start Function).
- *2: Refer to Problem Symptoms Table for Steering Lock System.
- *3: w/ Lexus Enform Remote
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Terminals Of Ecu
TERMINALS OF ECU CHECK POWER SWITCH (a) Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Input/Output Wiring Color Terminal Description
Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) The certification ECU (smart key ECU assembly) and hybrid vehicle control ECU control the vehicle immobiliser system functions. Immobiliser system data and Diagnostic
Dtc Check / Clear
DTC CHECK / CLEAR NOTICE: 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
SEE MORE:
Rear Wheel House Plate
ComponentsCOMPONENTS ILLUSTRATION *1 REAR WHEEL FRONT HOUSE PLATE LH - - RemovalREMOVAL CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. REMOVE REAR WHEEL FRONT HOUSE PLATE LH (a) Remove
Short in Motor Circuit (C1521,C1531-C1534)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition C1521 Short in Motor Circuit Motor overcurrent Power steering ECU assembly On Power switch on (IG) again C1531 ECU Malfunction ECU internal malfuncti
