Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2009SIENNA XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSDYNAMIC LASER CRUISE CONTROL SYSTEMPROBLEM SYMPTOMS TABLE
2009 Toyota Sienna XLE, FWD
Problem Symptoms Table
2009 Toyota Sienna XLE, FWDSECTION Problem Symptoms Table
HINT:
- Use the table below to help determine the cause of the problem symptom. The likely causes of the problem are indicated in descending order. Check each suspected area in order. Repair or replace faulty parts or perform adjustments as necessary.
- Inspect the fuse and relay related to this system before inspecting the suspected areas below.
Dynamic Laser Cruise Control System:
DYNAMIC LASER CRUISE CONTROL SYSTEM PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See |
|---|---|---|
| Main switch cannot be turned on. (CRUISE main indicator light on combination meter does not illuminate.) | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| CRUISE main indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | REMOVAL | |
| Vehicle speed setting cannot be done. (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 | 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 | |
| Vehicle speed setting cannot be done. (CRUISE main indicator light on combination meter illuminates when main switch is turned on, and remains on when operating SET function.) | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Stop light switch circuit | DTC P0571 BRAKE SWITCH "A" CIRCUIT | |
| Transmission range sensor circuit (U151E) | DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| Transmission range sensor circuit (U151F) | DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| Vehicle speed sensor circuit | DTC P0500 VEHICLE SPEED SENSOR MALFUNCTION; DTC P0503 VEHICLE SPEED SENSOR "A" INTERMITTENT / ERRATIC / HIGH | |
| Combination meter system | 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 | |
| While vehicle is driven with cruise control, the control is canceled. (CRUISE main indicator light remains on.) | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Vehicle speed sensor circuit | DTC P0500 VEHICLE SPEED SENSOR MALFUNCTION; DTC P0503 VEHICLE SPEED SENSOR "A" INTERMITTENT / ERRATIC / HIGH | |
| Stop light switch circuit | DTC P0571 BRAKE SWITCH "A" CIRCUIT | |
| Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Transmission range sensor circuit (U151E) | DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| Transmission range sensor circuit (U151F) | 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 | |
| Hunting (Speed is not constant.) | Vehicle speed sensor circuit | DTC P0500 VEHICLE SPEED SENSOR MALFUNCTION; DTC P0503 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 | |
| Vehicle speed setting cannot be canceled. (When coast, acceleration, resume, or set speed change function is operated with control switch.) | 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 | |
| Erroneous detection or lost sight of the vehicle ahead. | Clean laser sensor with soft cloth, etc. | - |
| Improper aiming of sensor beam axis | LASER SENSOR | |
| Alarm buzzer does not sound. | Skid control buzzer circuit | SKID CONTROL BUZZER CIRCUIT |
| VSC system | SYSTEM DESCRIPTION | |
| Distance control ECU power source circuit | DISTANCE CONTROL ECU POWER SOURCE CIRCUIT | |
| Distance control ECU | DISTANCE CONTROL ECU | |
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | REMOVAL | |
| Set distance cannot be changed. | Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING |
| Distance control switch circuit | DISTANCE CONTROL SWITCH CIRCUIT | |
| Distance control ECU | DISTANCE CONTROL ECU | |
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | REMOVAL | |
| No information on the display | Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING |
| If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | REMOVAL | |
| No brake control (when decelerating) | VSC system | SYSTEM DESCRIPTION |
| Distance control ECU power source circuit | DISTANCE CONTROL ECU POWER SOURCE CIRCUIT | |
| Distance control ECU | DISTANCE CONTROL ECU | |
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | REMOVAL | |
| Constant speed mode cannot be turned on. | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Combination meter system | 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 | |
| Vehicle speed setting cannot be canceled with wiper HI or LO. | Wiper signal circuit | WIPER SIGNAL CIRCUIT |
| Distance control ECU | DISTANCE CONTROL ECU | |
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | REMOVAL | |
| Vehicle speed setting is canceled with washer ON. | Washer signal circuit | WASHER SIGNAL CIRCUIT |
| Distance control ECU | DISTANCE CONTROL ECU | |
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | REMOVAL | |
| Unable to adjust (complete) beam axis of laser sensor. | Check position, distance and angle of reflector | LASER SENSOR |
| Check installation of laser sensor | INSTALLATION | |
| Laser sensor | LASER SENSOR | |
| Distance control ECU | DISTANCE CONTROL ECU | |
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. | REMOVAL | |
| Cannot change from constant speed control mode to vehicle-to-vehicle distance control mode. | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Laser sensor power source circuit | LASER SENSOR POWER SOURCE CIRCUIT | |
| Distance Control ECU | DISTANCE CONTROL ECU | |
| If the symptoms still occur after the above areas have been inspected and have 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 |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.