Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018WQS
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE; 2018 - 2020 MY Sienna [11/2017 -        ]

PROBLEM SYMPTOMS TABLE

NOTICE:

  • Before replacing the ECM, refer to Registration.

    Click here 2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): SFI SYSTEM: REGISTRATION

  • When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.
  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed.

    Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT

  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust.

    Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: FRONT CAMERA: ADJUSTMENT (SEQUENTIAL RECOGNITION)

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

Link

The dynamic radar cruise control system cannot be turned on using the cruise control main switch (ON-OFF button)

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Cruise control switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise Control Switch Circuit

Cruise main indicator light circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise Main Indicator Light Circuit

Combination meter assembly

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

Driving support ECU assembly

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DRIVING SUPPORT ECU: REMOVAL

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

The dynamic radar cruise control mode cannot be changed between vehicle-to-vehicle distance control mode and constant speed control mode

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Cruise control switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise Control Switch Circuit

Combination meter assembly

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

The vehicle-to-vehicle distance cannot be changed

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Distance control switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Distance Control Switch Circuit

Combination meter assembly

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

Driving support ECU assembly

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DRIVING SUPPORT ECU: REMOVAL

Vehicle speed setting cannot be performed (in constant speed control mode)

Fail-safe chart

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: FAIL-SAFE CHART

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Cruise control switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise Control Switch Circuit

Stop light switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: P057162; Brake Switch "A" Signal Compare Failure

Automatic transaxle system (for UA80E)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Automatic transaxle system (for UA80F)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Vehicle stability control system

2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

Vehicle speed setting cannot be performed (in vehicle-to-vehicle distance control mode)

Fail-safe chart

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: FAIL-SAFE CHART

Forward recognition camera is temporarily unavailable

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: FAIL-SAFE CHART

Millimeter wave radar sensor is dirty

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: FAIL-SAFE CHART

Millimeter wave radar sensor assembly beam axis not adjusted

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Cruise control switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise Control Switch Circuit

Automatic transaxle system (for UA80E)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Automatic transaxle system (for UA80F)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Millimeter wave radar sensor assembly

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: REMOVAL

Forward recognition camera

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: FRONT CAMERA: REMOVAL

Vehicle stability control system

2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Combination meter assembly

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

Driving support ECU assembly

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DRIVING SUPPORT ECU: REMOVAL

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

Control of vehicle speed by the dynamic radar cruise control system is canceled (in constant speed control mode)

Fail-safe chart

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: FAIL-SAFE CHART

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Cruise control switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise Control Switch Circuit

Stop light switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: P057162; Brake Switch "A" Signal Compare Failure

Automatic transaxle system (for UA80E)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Automatic transaxle system (for UA80F)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Vehicle stability control system

2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

Control of vehicle speed by the dynamic radar cruise control system is canceled (in vehicle-to-vehicle distance control mode)

Fail-safe chart

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: FAIL-SAFE CHART

Forward recognition camera is temporarily unavailable

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: FAIL-SAFE CHART

Millimeter wave radar sensor is dirty

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: FAIL-SAFE CHART

Millimeter wave radar sensor assembly beam axis not adjusted

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Cruise control switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise Control Switch Circuit

Automatic transaxle system (for UA80E)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Automatic transaxle system (for UA80F)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Millimeter wave radar sensor assembly

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: REMOVAL

Forward recognition camera

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: FRONT CAMERA: REMOVAL

Vehicle stability control system

2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Combination meter assembly

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

Driving support ECU assembly

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DRIVING SUPPORT ECU: REMOVAL

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

Hunting/vehicle speed is not constant (in constant speed control mode)

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Vehicle stability control system

2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

Hunting/vehicle speed is not constant (in vehicle-to-vehicle distance control mode)

Millimeter wave radar sensor assembly is dirty

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: FAIL-SAFE CHART

Millimeter wave radar sensor assembly beam axis not adjusted

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Vehicle stability control system

2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Driving support ECU assembly

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DRIVING SUPPORT ECU: REMOVAL

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

Pulling the cruise control main switch to CANCEL does not cancel control of vehicle speed by the dynamic radar cruise control system

Cruise control switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise Control Switch Circuit

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

Moving the shift lever does not cancel control of vehicle speed by the dynamic radar cruise control system

Park/neutral position switch (for UA80E)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: REMOVAL

Park/neutral position switch (for UA80F)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: REMOVAL

Transmission floor shift assembly (for UA80E)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): SHIFT LEVER: REMOVAL

Transmission floor shift assembly (for UA80F)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): SHIFT LEVER: REMOVAL

Automatic transaxle system (for UA80E)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Automatic transaxle system (for UA80F)

2017 - 2020 MY Sienna [08/2016 -        ]; UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

Depressing the brake pedal does not cancel control of vehicle speed by the dynamic radar cruise control system

Stop light switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: P057162; Brake Switch "A" Signal Compare Failure

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

Even though the millimeter wave radar sensor is not dirty, the warning message "Clean Sensor" is displayed

Millimeter wave radar sensor assembly

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: REMOVAL

The vehicle approach warning buzzer does not sound

Skid control buzzer circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: C1A4A; Skid Control Buzzer Circuit

Check millimeter wave radar sensor assembly installation position

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: INSTALLATION

Check installation of forward recognition camera

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: FRONT CAMERA: INSTALLATION

Forward recognition camera

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: FRONT CAMERA: REMOVAL

Millimeter wave radar sensor assembly

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: REMOVAL

Driving support ECU assembly

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DRIVING SUPPORT ECU: REMOVAL

Even though the vehicle approach warning buzzer is sounding, brake control is not performed when decelerating

Vehicle stability control system

2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Driving support ECU assembly

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DRIVING SUPPORT ECU: REMOVAL

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

Even though the SET function is operating, the cruise SET indicator does not illuminate

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Cruise SET indicator light circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise SET Indicator Light Circuit

Combination meter assembly

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

The cruise control indicator remains illuminated

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Cruise main indicator light circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise Main Indicator Light Circuit

Combination meter assembly

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

Indicators are not illuminated on the multi-information display in the combination meter assembly

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Combination meter assembly

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL

The buzzer does not sound when control of vehicle speed by the dynamic radar cruise control is canceled

CAN communication system

2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Combination meter assembly

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

ECM

2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ECM: REMOVAL