Problem Symptoms Table
WARNING: This page is about a different car, the 2007 Lexus RX 350. 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.
- Inspect the fuse and relay related to this system before inspecting the suspected areas below.
CRUISE CONTROL SYSTEM:
PROBLEM SYMPTOMS TABLE
| Symptom | Suspected area | See |
|---|---|---|
| Vehicle speed cannot be set. (The CRUISE main indicator light comes on.) | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Combination meter | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Vehicle speed sensor circuit | DTC P0500, P0503: VEHICLE SPEED SENSOR MALFUNCTION; VEHICLE SPEED SENSOR "A" INTERMITTENT/ERRATIC/HIGH | |
| Stop light switch circuit | DTC P0571: BRAKE SWITCH "A" CIRCUIT | |
| Park/Neutral position sensor circuit | DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | REMOVAL | |
| Pushing the ON-OFF button does not turn the cruise control system on. (Vehicle speed cannot be set.) | Stop light switch circuit | DTC P0571: BRAKE SWITCH "A" CIRCUIT |
| Vehicle speed sensor circuit | DTC P0500, P0503: VEHICLE SPEED SENSOR MALFUNCTION; VEHICLE SPEED SENSOR "A" INTERMITTENT/ERRATIC/HIGH | |
| Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT | |
| Park/Neutral position switch circuit | DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| Combination meter | HOW TO PROCEED WITH TROUBLESHOOTING | |
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | REMOVAL | |
| Pushing the ON-OFF button does not turn the cruise control system on. (Vehicle speed can be set.) | Cruise main indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT |
| If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | REMOVAL | |
| The cruise control is canceled while it is operating. | Stop light switch circuit | DTC P0571: BRAKE SWITCH "A" CIRCUIT |
| Park/Neutral position switch circuit | DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT | |
| Vehicle speed sensor circuit | DTC P0500, P0503: VEHICLE SPEED SENSOR MALFUNCTION; VEHICLE SPEED SENSOR "A" INTERMITTENT/ERRATIC/HIGH | |
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | REMOVAL | |
| Pulling back on the control main switch does not cancel the cruise control. (The CRUISE main indicator light remains on.) | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | REMOVAL | |
| Pulling back on the control main switch does not cancel the cruise control. (The CRUISE main indicator light goes off.) | Replace the ECM | REMOVAL |
| The cruise control is not canceled when vehicle speed drops below the low speed limit. (The CRUISE main indicator light remains on.) | Vehicle speed sensor circuit | DTC P0500, P0503: VEHICLE SPEED SENSOR MALFUNCTION; VEHICLE SPEED SENSOR "A" INTERMITTENT/ERRATIC/HIGH |
| If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | REMOVAL | |
| The cruise control is not canceled when vehicle speed drops below the low speed limit. (The CRUISE main indicator light goes off.) | Replace the ECM | REMOVAL |
| Depressing the brake pedal does not cancel the cruise control. (The CRUISE main indicator light remains on.) | Stop light switch circuit | DTC P0571: BRAKE SWITCH "A" CIRCUIT |
| If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | REMOVAL | |
| Depressing the brake pedal does not cancel the cruise control. (The CRUISE main indicator light goes off.) | Replace the ECM | REMOVAL |
| Moving the shift lever does not cancel the cruise control. | Park/Neutral position switch circuit | DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) |
| If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | REMOVAL | |
| Hunting (Speed is not constant.) | Vehicle speed sensor circuit | DTC P0500, P0503: VEHICLE SPEED SENSOR MALFUNCTION; VEHICLE SPEED SENSOR "A" INTERMITTENT/ERRATIC/HIGH |
| If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | REMOVAL | |
| The CRUISE main indicator light remains blinking. | TC and CG terminal circuit | TC AND CG TERMINAL CIRCUIT |
| If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | REMOVAL |