| Last Modified: 11-27-2007 | 1.6 T | |
| Service Category: Engine/Hybrid System | Section: Cruise Control | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000000PLS036X |
| Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE (2008 LX570) | ||
PROBLEM SYMPTOMS TABLE
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, 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.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Dynamic Radar Cruise Control System
|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
Main switch cannot be turned on (CRUISE main indicator light on combination meter does not illuminate) |
Cruise control switch circuit |
|
|
CRUISE main indicator light circuit |
|
|
|
Meter/gauge system |
|
|
|
ECM |
|
|
|
CAN communication line |
|
|
|
Vehicle speed setting cannot be performed (CRUISE main indicator light on combination meter illuminates when main switch is turned on, but turns off when operating SET function) |
Cruise control switch circuit |
|
|
ECM |
|
|
|
Vehicle speed setting cannot be performed (CRUISE main indicator light on combination meter illuminates when main switch is turned on, and remains illuminated when operating SET function) |
Cruise control switch circuit |
|
|
Vehicle speed sensor circuit |
|
|
|
Meter/gauge system |
|
|
|
ECM |
|
|
|
CAN communication line |
|
|
|
While the vehicle is driving with cruise control, the SET control is canceled (CRUISE main indicator light remains illuminated) |
Cruise control switch circuit |
|
|
Vehicle speed sensor circuit |
|
|
|
Stop light switch circuit |
|
|
|
CRUISE main indicator light circuit |
|
|
|
Park/neutral position switch circuit |
|
|
|
CAN communication line |
|
|
|
ECM |
|
|
|
Hunting (speed is not constant) |
Vehicle speed sensor circuit |
|
|
Speedometer malfunction |
|
|
|
Millimeter wave radar sensor power source circuit |
|
|
|
Distance control ECU power source circuit |
|
|
|
Distance control ECU |
|
|
|
CAN communication line |
|
|
|
ECM |
|
|
|
Vehicle speed setting cannot be canceled (CANCEL function failure) |
Cruise control switch circuit |
|
|
ECM |
|
|
|
DTC is not output, or is output when it should not be |
TC and CG terminal circuit |
|
|
ECM |
|
|
|
Erroneous detection or lost sight of vehicle in front |
Clean radar sensor with soft cloth, etc. |
- |
|
Improper aiming of sensor beam axis |
|
|
|
Warning buzzer does not sound |
Warning buzzer circuit |
|
|
Vehicle stability control system |
|
|
|
Millimeter wave radar sensor power source circuit |
|
|
|
Distance control ECU power source circuit |
|
|
|
Distance control ECU |
|
|
|
ECM |
|
|
|
Set distance cannot be changed |
Meter/gauge system |
|
|
Cruise control switch circuit |
|
|
|
Distance control switch circuit |
|
|
|
ECM |
|
|
|
No display |
Meter/gauge system |
|
|
CAN communication line |
|
|
|
ECM |
|
|
|
No brake control (when decelerating) |
Vehicle stability control system |
|
|
Distance control ECU power source circuit |
|
|
|
Distance control ECU |
|
|
|
CAN communication line |
|
|
|
ECM |
|
|
|
Constant speed control mode cannot be turned on |
Cruise control switch circuit |
|
|
Meter/gauge system |
|
|
|
ECM |
|
|
|
Vehicle speed cannot be canceled with wiper HI (including automatic wiper) |
Wiper switch (HI speed) circuit |
|
|
Distance control ECU |
|
|
|
ECM |
|
|
|
Unable to adjust beam axis of front millimeter wave radar sensor |
Check for DTC P1570 |
|
|
Check position, distance and angle of reflector |
|
|
|
Check installation of millimeter wave radar sensor |
|
|
|
Millimeter wave radar sensor |
|
|
|
Distance control ECU |
|
|
|
ECM |
|
|
|
System cannot change between constant speed control mode and vehicle-to-vehicle distance control mode |
Cruise control switch circuit |
|
|
ECM |
|
|
|