Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018K32
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM(w/ Steering Control): PROBLEM SYMPTOMS TABLE; 2018 - 2020 MY Sienna [11/2017 -        ]

PROBLEM SYMPTOMS TABLE

HINT:

  • If any of the following symptoms exist despite the normal system code being output when checking for CAN communication and lane departure alert system DTCs, check the suspected areas in the order they are listed.
  • 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.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Lane Departure Alert System

Symptom

Suspected Area

Link

Lane departure alert system does not operate

Power source circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM(w/ Steering Control): Power Source Circuit

Steering pad switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM(w/ Steering Control): Steering Pad Switch Circuit

CAN communication system

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

Forward recognition camera

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

The lane departure alert indicator does not illuminate even when the lane departure alert main switch is operated.

Indicator circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM(w/ Steering Control): Indicator Circuit

Steering pad switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM(w/ Steering Control): Steering Pad Switch Circuit

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

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

The lane departure alert indicator does not turn off even when the lane departure alert main switch is operated.

Indicator circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM(w/ Steering Control): Indicator Circuit

Steering pad switch circuit

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM(w/ Steering Control): Steering Pad Switch Circuit

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

Forward recognition camera

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

Lane departure alert system is not canceled even when turn signal light switch is operated

Data List/Active Test

(Check turn signal switch signal)

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM(w/ Steering Control): DATA LIST / ACTIVE TEST

Turn signal switch circuit

2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (EXT): LIGHTING SYSTEM: Turn Signal Switch Circuit

Forward recognition camera

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

Increase in cases that driver can see lane markers but system cannot detect lane markers

Windshield glass is dirty

-

Forward recognition camera is dirty

-

Headlight assemblies are dirty or worn

-

Non-standard suspension is installed

-

Non-standard tires are installed

-

Non-Toyota genuine windshield glass is installed

-

There is a foreign object or foreign matter between the windshield glass and forward recognition camera

-

A sticker or similar item is attached to the area in front of the forward recognition camera

-

Adjust forward recognition camera

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

Lane departure alert system is operating, but no operation condition is displayed on multi-information display in combination meter assembly

Data List/Active Test

(Check the item LDA Control)

2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: LANE DEPARTURE ALERT SYSTEM(w/ Steering Control): DATA LIST / ACTIVE TEST

Combination meter assembly

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

Forward recognition camera

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

Buzzer does not sound even when vehicle deviates from its lane.

Combination meter assembly

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

Forward recognition camera

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