Problem Symptoms Table
WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
HINT
Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary
Steering lock system
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See |
|---|---|---|
| Steering wheel cannot unlock (hybrid control system cannot start) | Steering lock actuator assembly (steering lock ECU) | PROBLEM SYMPTOMS TABLE |
| Main body ECU | TERMINALS OF ECU | |
| Certification ECU | TERMINALS OF ECU | |
| Smart access system with push-button start | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Steering lock motor drive power circuit | STEERING LOCK MOTOR DRIVE POWER CIRCUIT | |
| Unlock position sensor signal circuit | UNLOCK POSITION SENSOR SIGNAL CIRCUIT | |
| Power source circuit | POWER SOURCE CIRCUIT | |
| Steering wheel cannot unlock (after connecting intelligent tester or Techstream to DLC3, power switch ON (IG), Data List certification ECUs item Lock/Unlock Receive data is read, and steering lock command reception records display is NO) | Main body ECU | TERMINALS OF ECU |
| Certification ECU | TERMINALS OF ECU | |
| ID code box | TERMINALS OF ECU | |
| LIN communication line | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Smart access system with push-button start | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Steering wheel cannot lock | Steering lock actuator assembly (steering lock ECU) | PROBLEM SYMPTOMS TABLE |
| Main body ECU | TERMINALS OF ECU | |
| Certification ECU | TERMINALS OF ECU | |
| Smart access system with push-button start | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Steering lock motor drive power circuit | STEERING LOCK MOTOR DRIVE POWER CIRCUIT | |
| Power source circuit | POWER SOURCE CIRCUIT | |
| Steering wheel cannot lock (after connecting intelligent tester or Techstream to DLC3, power switch ON (IG), Data List certification ECUs item Lock/Unlock Receive data is read, and steering lock command reception records display is NO) | Main body ECU | TERMINALS OF ECU |
| Certification ECU | TERMINALS OF ECU | |
| ID code box | TERMINALS OF ECU | |
| LIN communication line | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Smart access system with push-button start | HOW TO PROCEED WITH TROUBLESHOOTING |