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.
If the normal codes for the pre-collision system and CAN communication system are output but the following problem symptoms are present, perform the malfunction diagnosis by following the "Suspected Area" procedures below.
Pre-collision system
PROBLEM SYMPTOMS REFERENCE
| Symptom | Suspected Area | See |
|---|---|---|
| "Check PCS system" is displayed | Seat belt control ECU | SEAT BELT CONTROL ECU |
| Combination Meter | REMOVAL | |
| "PCS not Available Now" is displayed | Pre-collision brake cancel switch is ON | - |
| System determines obstacles cannot be detected due to front millimeter wave radar sensor or radiator grille being dirty If dirt is removed, normal control returns (Dirt history can be checked using DATA LIST) | - | |
| System determines wave radar sensor cannot detect obstacles due to bad weather If weather recovers, normal control returns (Bad weather history can be checked using DATA LIST) | - | |
| Overheating protection fail-safe of seat belt control ECU operates If ECU temperature drops, normal control returns | - | |
| Pre-collision brake cancel switch | - | |
| Wire harness between pre-collision brake cancel switch and driving support ECU | - | |
| Front millimeter wave radar sensor | REMOVAL | |
| Seat belt control ECU | SEAT BELT CONTROL ECU | |
| Driving support ECU | REMOVAL | |
| Although there is possibility of collision, pre-collision control (all front collision controls) do not operate ("PCS not available now" is not displayed) | Vehicle condition/environment does not match pre-collision control operation conditions (Confirm control operation conditions) | - |
| Check installation condition of front millimeter wave radar sensor | INSTALLATION | |
| Perform front millimeter wave radar sensor adjustment | ADJUSTMENT | |
| Front millimeter wave radar sensor | REMOVAL | |
| Driving support ECU | REMOVAL | |
| Although there is no possibility of collision, pre-crash | Check installation condition of front millimeter wave radar sensor | INSTALLATION |
| Perform front millimeter wave radar sensor adjustment | REMOVAL | |
| Front millimeter wave radar sensor | REMOVAL | |
| Driving support ECU | REMOVAL | |
| Only pre-collision seat belt does not operate | Buckle switch error (malfunction in which DTC is not output) | - |
| Seat belt control ECU | SEAT BELT CONTROL ECU | |
| Pre-collision brake cannot be canceled (pre-collision warning indicator does not blink) | Combination meter (check if indicator blinks using ACTIVE TEST) | DATA LIST / ACTIVE TEST |
| Pre-collision brake cancel switch | - | |
| Wire harness between pre-collision brake cancel switch and driving support ECU | - | |
| Driving support ECU | REMOVAL |