Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018YB4
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: PRE-COLLISION: PRE-COLLISION SYSTEM: DIAGNOSIS SYSTEM; 2018 - 2020 MY Sienna [11/2017 -        ]

DIAGNOSIS SYSTEM

CHECK DLC3

(a) Check the DLC3.

Click here 2016 - 2020 MY Sienna [12/2015 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: GENERAL INFORMATION

FUNCTION OF WARNING INDICATOR AND MESSAGE

(a) If the pre-collision system is not functioning properly, the driver is warned by the PCS warning light and a warning message displayed on the multi-information display.

Master Warning Indicator

Warning Message

Detail

DTC

PCS warning light

Illuminated

"PCS System Malfunction Contact Your Dealer" is displayed

Pre-collision system malfunctioning

Stored

Blinks

Not illuminated

"Pre-Collision System Unavailable"
  • Millimeter wave radar sensor assembly misaligned
  • Millimeter wave radar sensor assembly temperature malfunction
  • Millimeter wave radar sensor assembly low voltage malfunction

Not stored

Blinks

Not illuminated

"Pre-Collision System Unavailable Clean Sensor"

Foreign matter attached to millimeter wave radar sensor assembly

Not stored

Blinks

Not illuminated

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

Not stored

Blinks

Not illuminated

"Forward Camera System Unavailable Clean Windshield"
  • Foreign matter attached to forward recognition camera or area of windshield in front of forward recognition camera
  • Forward recognition camera or area of windshield in front of forward recognition camera is fogged up or covered with condensation or ice

Not stored

Illuminates

Not illuminated

"VSC Turned Off Pre-Collision Brake System Unavailable"

VSC system is disabled

Not stored

Illuminates

PCS Warning Light Illumination Status

PCS Warning Light

Condition

Blinks

ON: 0.5 sec./OFF: 1.5 sec.

Pre-collision system malfunctioning (DTC stored)

Pre-collision system temporarily disabled

Pre-collision system temporarily unavailable (for reasons other than dirty or fogged up camera or windshield)

Illuminates

Pre-collision system disabled

VSC system disabled

Pre-collision system temporarily unavailable (for reasons other than dirty or fogged up camera or windshield)

Not illuminated

Other

INITIAL CHECK

(a) An initial check is performed when the ignition switch is off for more than 2 seconds and then turned on (IG). The initial check consists of a pre-collision system diagnostic check with a duration of approximately 3 seconds.

(b) If a malfunction is detected during the initial check, the PCS warning light in the combination meter assembly will blink or illuminates and a warning message indicating the pre-collision system is malfunctioning or disabled will be displayed on the multi-information display.

CONSTANT CHECK

(a) The driving support ECU assembly constantly monitors the pre-collision system for malfunctions after the ignition switch is turned to ON and the initial check (approximately 3 seconds) has completed.

(b) If a malfunction is detected during the constant check, the PCS warning light in the combination meter assembly will blink or illuminates and a warning message indicating the pre-collision system is malfunctioning or disabled will be displayed on the multi-information display.