Lexus IS250 IS220d GSE20 ALE20 - CRUISE CONTROL
CRUISE CONTROL SYSTEM - PROBLEM SYMPTOMS TABLE
Be sure to perform the SYMPTOM SIMULATION procedure before replacing the ECM. If these symptoms do not persist, the cause of the problem may be a poor intermittent electrical contact (open or short) of a wire harness or connector.
| Symptom | Suspected area | See page |
| Vehicle speed cannot be set. (The CRUISE main indicator light comes on.) | 1. Cruise control switch circuit | |
| 2. If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | ||
| Pushing the ON-OFF button does not turn the cruise control system on. (Vehicle speed cannot be set.) | 1. Stop light switch circuit | |
| 2. Clutch switch circuit | ||
| 3. Vehicle speed sensor circuit | ||
| 4. Cruise control switch circuit | ||
| 5. Park/Neutral position sensor circuit | ||
| 6. Shift paddle switch circuit | ||
| 7. If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | ||
| Pushing the ON-OFF button does not turn the cruise control system on. (Vehicle speed can be set.) | 1. Cruise main indicator light circuit | |
| 2. If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | ||
| The cruise control is canceled while it is operating. | 1. Stop light switch circuit | |
| 2. Clutch switch circuit | ||
| 3. Park/Neutral position sensor circuit | ||
| 4. Shift paddle switch circuit | ||
| 5. Cruise control switch circuit | ||
| 6. Vehicle speed sensor circuit | ||
| 7. If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | ||
| Pulling back on the control main switch does not cancel the cruise control. (The CRUISE main indicator light remains on.) | 1. Cruise control switch circuit | |
| 2. If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | ||
| Pulling back on the control main switch does not cancel the cruise control. (The CRUISE main indicator light goes off.) | 1. ECM | |
| The cruise control is not canceled when vehicle speed drops below the low speed limit. (The CRUISE main indicator light remains on.) | 1. Vehicle speed sensor circuit | |
| 2. If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | ||
| The cruise control is not canceled when vehicle speed drops below the low speed limit. | 1. ECM | |
| Depressing the brake pedal does not cancel the cruise control. (The CRUISE main indicator light remains on.) | 1. Stop light switch circuit | |
| 2. If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | ||
| Depressing the brake pedal does not cancel the cruise control. (The CRUISE main indicator light goes off.) | 1. ECM | |
| Depressing the clutch pedal does not cancel the cruise control. (The CRUISE main indicator light remains on.) | 1. Clutch switch circuit | |
| 2. If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | ||
| Depressing the clutch pedal does not cancel the cruise control. (The CRUISE main indicator light goes off.) | 1. ECM | |
| Moving the shift liver does not cancel the cruise control. | 1. Park/Neutral position switch circuit | |
| 2. Shift paddle switch circuit | ||
| 3. If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | ||
| Hunting. (Speed is not constant.) | 1. Vehicle speed sensor circuit | |
| 2. If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | ||
| The CRUISE main indicator light remains blinking. | 1. TC and CG terminal circuit | |
| 2. If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. |