Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018YB2
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: PRE-COLLISION: PRE-COLLISION SYSTEM: PROBLEM SYMPTOMS TABLE; 2018 - 2020 MY Sienna [11/2017 -        ]

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.
  • The pre-collision system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

Pre-Collision System

Symptom

Suspected Area

Link

"Pre-Collision System Unavailable" is displayed

Perform millimeter wave radar sensor assembly adjustment

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

Millimeter wave radar sensor assembly temperature malfunction

2018 - 2020 MY Sienna [11/2017 -        ]; PRE-COLLISION: PRE-COLLISION SYSTEM: DATA LIST / ACTIVE TEST

Millimeter wave radar sensor assembly low voltage malfunction

2018 - 2020 MY Sienna [11/2017 -        ]; PRE-COLLISION: PRE-COLLISION SYSTEM: DATA LIST / ACTIVE TEST

Millimeter wave radar sensor assembly

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

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

"Pre-Collision System Unavailable Clean Sensor" is displayed

Foreign matter attached to millimeter wave radar sensor assembly

-

Millimeter wave radar sensor assembly

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

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

"Front Camera Unavailable" is displayed

Check current condition of forward recognition camera based on related Data List items.

  • Abnormal forward recognition camera voltage
  • Forward recognition camera temperature outside of operational range
  • Other forward recognition camera malfunction

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: FORWARD RECOGNITION CAMERA SYSTEM: DATA LIST / ACTIVE TEST

Forward recognition camera

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

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

"Front Camera System Unavailable Clean Windshield" is displayed

Foreign matter attached to forward recognition camera or area of windshield in front of forward recognition camera

-

Forward recognition camera

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

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

Although there is possibility of collision, pre-collision controls (all controls) do not operate ("Pre-collision System Unavailable" is not displayed)

Check if pre-collision system is canceled

-

Vehicle condition/environment does not match the pre-collision system operation conditions (Confirm control operation conditions).

2018 - 2020 MY Sienna [11/2017 -        ]; PRE-COLLISION: PRE-COLLISION SYSTEM: SYSTEM DESCRIPTION

Check installation condition of millimeter wave radar sensor assembly

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

Perform millimeter wave radar sensor assembly adjustment

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

Millimeter wave radar sensor assembly

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

Check installation condition of forward recognition camera

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

Perform forward recognition camera adjustment

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

Forward recognition camera

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

Driving support ECU assembly

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

Although there is no possibility of collision, pre-collision controls (all controls) operate

Vehicle condition/environment does not match the pre-collision system operation conditions (Confirm control operation conditions).

2018 - 2020 MY Sienna [11/2017 -        ]; PRE-COLLISION: PRE-COLLISION SYSTEM: SYSTEM DESCRIPTION

Check installation condition of millimeter wave radar sensor assembly

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

Perform millimeter wave radar sensor assembly adjustment

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

Millimeter wave radar sensor assembly

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

Check installation condition of forward recognition camera

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

Perform forward recognition camera adjustment

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

Forward recognition camera

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

Driving support ECU assembly

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

Pre-collision system does not operate

Check if pre-collision system is canceled

-

ECU power source circuit

2018 - 2020 MY Sienna [11/2017 -        ]; PRE-COLLISION: PRE-COLLISION SYSTEM: ECU Power Source Circuit

Driving support ECU assembly

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

Pre-collision system cannot be canceled (PCS warning light does not illuminate)

Combination meter assembly (check if indicator illuminates using Active Test)

2018 - 2020 MY Sienna [11/2017 -        ]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: DATA LIST / ACTIVE TEST

Driving support ECU assembly

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

Combination meter assembly

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