Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018WQU
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DIAGNOSIS SYSTEM; 2018 - 2020 MY Sienna [11/2017 -        ]

DIAGNOSIS SYSTEM

1. DIAGNOSIS FUNCTION

(a) The diagnosis function turns off the cruise control indicator, illuminates the master warning light and displays a warning message when a malfunction is detected. When a malfunction is detected in the dynamic radar cruise control system, DTCs are stored in the ECM or driving support ECU assembly.

Text in Illustration

*a

Multi-information Display

*b

Master Warning Light

*c

Cruise Main Indicator

(Constant speed control mode)

*d

Cruise Main Indicator

(Vehicle-to-vehicle distance control mode)

NOTICE:

  • If DTCs related to the communication system are stored, "Cruise Control Malfunction Visit Your Dealer", which is displayed in the combination meter assembly, disappears when the system returns to normal.
  • If DTCs not related to the communication system are stored, "Cruise Control Malfunction Visit Your Dealer", which is displayed in the combination meter assembly, disappears when the ignition switch is turned off then back to ON after the system returns to normal.

2. DESCRIPTION

(a) The ECM and driving support ECU controls the dynamic radar cruise control system of the vehicle. The data and DTCs relating to the dynamic radar cruise control system can be read from the DLC3 of the vehicle. If the cruise main indicator does not come on after the DTC check, there may be a problem with either the combination meter assembly or the CAN communication systems. Use the Techstream to check and solve the problem.

3. CHECK DLC3

(a) Check the DLC3 (See page 2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DTC CHECK / CLEAR ).

4. CHECK INDICATOR

(a) Turn the ignition switch to ON.

(b) Check that the cruise control indicator (constant speed control mode) or cruise control indicator (vehicle-to-vehicle distance control mode) illuminates when the dynamic radar cruise control system is turned on using the cruise control main switch (ON-OFF button), and that the indicator goes out when the dynamic radar cruise control system is turned off using the cruise control main switch (ON-OFF button).

*a

Cruise Main Indicator (Constant speed control mode)

*b

Cruise Main Indicator

(Vehicle-to-vehicle distance control mode)

HINT:

  • If the indicator check result has a malfunction, proceed to troubleshooting of the combination meter assembly.
  • While driving with the dynamic radar cruise control system controlling vehicle speed, the ECM will automatically cancel control of vehicle speed by the dynamic radar cruise control system when a malfunction is detected in one of the following: vehicle speed sensors, stop light switch assembly, or other related parts. When control of vehicle speed by the dynamic radar cruise control system is automatically canceled, the cruise control indicator (constant speed control mode) or cruise control indicator (vehicle-to-vehicle distance control mode) go out. In addition, a warning message may be displayed and malfunction data is stored as a DTC.