Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIUV
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 11/2017]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PRECAUTION; 2016 - 2017 MY Sienna [12/2015 - 11/2017]

PRECAUTION

1. IGNITION SWITCH EXPRESSIONS

(a) The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section.

Expression

Switch (Position)

Engine Switch (Condition)

Ignition switch off

LOCK

Off

Ignition switch ACC

ACC

On (ACC)

Ignition switch ON

ON

On (IG)

Engine start

START

Start

2. TROUBLESHOOTING PRECAUTIONS

(a) When there is a malfunction with terminal contact points or part installation problems, removal and installation of the suspected parts may return the system to the normal condition either completely or temporarily.

(b) In order to determine the malfunctioning area, be sure to check the conditions at the time the malfunction occurred, such as DTC output and the Freeze Frame Data, and record them before disconnecting each connector or removing and installing parts.

(c) Since the system may be influenced by malfunctions in systems other than the VSC system, be sure to check for DTCs in other systems.

3. HANDLING PRECAUTIONS

(a) Do not remove or install VSC parts such as the steering angle sensor or yaw rate and acceleration sensor except when necessary, as they must be calibrated after removal or installation.

(b) Be sure to perform preparation before work and confirmation after work is completed by following the directions in the repair manual when working on the VSC system.

(c) Be sure to remove and install the ECU, brake actuator and each sensor, etc. with the ignition switch off unless otherwise specified in the inspection procedure.

(d) If the ECU, brake actuator or a sensor has been removed and installed, it is necessary to check the system for problems after the parts have been reassembled. Check for DTCs using the Techstream, and also check that system functions and signals received by the ECU are normal using Test Mode.

4. DTC PRECAUTION

(a) Warnings for some DTCs will not be cleared by just replacing the defective parts. If a warning is still displayed after completing a repair, turn the ignition switch off before beginning the procedure for clearing DTCs.

NOTICE:

If a part is still malfunctioning even after the DTC is cleared, the DTC will be stored again.

5. CHASSIS DYNAMOMETER PRECAUTION

When testing with a 2-wheel drum tester such as a speedometer tester, a combination tester for the speedometer and brake, a chassis dynamometer, or when jacking up the front wheels and turning the wheels, perform the following procedure to enter the Inspection Mode and stop the TRAC and VSC systems.

Enter Inspection Mode to disable TRAC and VSC control when using a chassis dynamometer.

HINT:

The vehicle may move unexpectedly out of the dynamometer because of TRAC and VSC operations.

NOTICE:

  • Secure the vehicle with the lock chain for safety.
  • When performing procedures related to VSC OFF switch operation, make sure that the mode is VSC OFF mode.

(a) Activating Inspection Mode (When Using the Techstream)

(1) Ensure that the ignition switch is off and the engine is stopped.

(2) Make sure that the shift lever is in P.

(3) Connect the Techstream to the DLC3.

(4) Start the engine.

(5) Turn the Techstream on.

(6) Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Inspection Mode.

(7) Check that the VSC OFF indicator light comes on and the "TRAC OFF"*1 or "Traction Control OFF"*2 message will be displayed on the multi-information display.

HINT:

  • If the VSC OFF indicator light does not come on and the "TRAC OFF"*1 or "Traction Control OFF"*2 message is not displayed on the multi-information display, repeat the steps.
  • Turning the ignition switch off ends Inspection Mode.
  • *1: for Multi-information Display (Monochrome Type)
  • *2: for Multi-information Display (Color Type)

(b) Activating Inspection Mode (When not Using the Techstream)

HINT:

  • Perform steps "D" to "H" within 30 seconds.

(1) Ensure that the ignition switch is off and the engine is stopped (Step "A").

(2) Make sure that the shift lever is in P (Step "B").

(3) Start the engine (Step "C").

(4) Apply the parking brake by depressing the parking brake pedal (Step "D").

(5) Depress and release the brake pedal twice (Step "E").

(6) Depress and hold the brake pedal down, then release and apply the parking brake twice (Step "F").

(7) With the parking brake applied, depress and release the brake pedal twice (Step "G").

(8) Check that the VSC OFF indicator light comes on and the "TRAC OFF"*1 or "Traction Control OFF"*2 message is displayed on the multi-information display (Step "H").*2

HINT:

  • If the VSC OFF indicator light does not come on and the "TRAC OFF"*1 or "Traction Control OFF"*2 message is not displayed on the multi-information display in step "H", repeat steps "A" to "H".
  • Turning the ignition switch off ends Inspection Mode.
  • *1: for Multi-information Display (Monochrome Type)
  • *2: for Multi-information Display (Color Type)

6. CAN COMMUNICATION SYSTEM PRECAUTIONS

(a) The CAN communication system is used for data communication between the skid control ECU, the steering angle sensor, the yaw rate and acceleration sensor and other ECUs. If there are any problems in the CAN communication lines, corresponding DTCs for the communication lines are output.

(b) If any CAN communication line DTCs are output, repair the malfunction in the communication lines and troubleshoot the VSC system after data communication becomes normal.

(c) In order to enable CAN communication, a specific type of wiring is used for the CAN communication lines. The wiring used for each communication line is a twisted pair of wires that have an equal length. A bypass wire should not be used because the data being transmitted will be corrupted.