Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018WSV
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: Cruise Control Switch Circuit; 2018 - 2020 MY Sienna [11/2017 -        ]

Cruise Control Switch Circuit

DESCRIPTION

The cruise control main switch operates 8 functions: SET, -(COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, CANCEL, and MODE. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it. The internal contact point of the cruise control main switch is turned on with the switch operation. The ECM then reads the voltage value that has been changed by the switch operation to control MODE, SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL. The dynamic radar cruise control system has two cruise control modes: the constant speed control mode and vehicle-to-vehicle distance control mode.

  • The vehicle-to-vehicle distance control mode is always selected when starting up the dynamic radar cruise control system.
  • The operation of the constant speed control mode is the same as that for a conventional cruise control system.

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM (CRUISE CONTROL MAIN SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Radar Cruise 1 / Data List.

(e) Check the Data List for proper functioning of the cruise control main switch.

Radar Cruise 1

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Cancel Switch

CANCEL switch status/

ON or OFF

ON: CANCEL switch on

OFF: CANCEL switch off

-

-SET Switch

-SET switch status/

ON or OFF

ON: -SET switch on

OFF: -SET switch off

-

+RES Switch

+RES switch status/

ON or OFF

ON: +RES switch on

OFF: +RES switch off

-

Cruise Main Switch Operation Condition

Cruise control main switch (ON/OFF button) status/

ON or OFF

ON: Cruise control main switch (ON/OFF button) pushed

OFF: Cruise control main switch (ON/OFF button) not pushed

-

OK:

When the cruise control main switch is operated, the display changes as shown above.

Result

Result

Proceed to

OK

A

NG (all items are defective)

B

NG (1 to 3 items are defective)

C

A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

REPLACE CRUISE CONTROL MAIN SWITCH

B

2.

INSPECT CRUISE CONTROL MAIN SWITCH

(a) Remove the cruise control main switch.

Click here 2016 - 2020 MY Sienna [12/2015 -        ]; CRUISE CONTROL: CRUISE CONTROL MAIN SWITCH: REMOVAL

(b) Inspect the cruise main switch.

Click here 2016 - 2020 MY Sienna [12/2015 -        ]; CRUISE CONTROL: CRUISE CONTROL MAIN SWITCH: INSPECTION

NG

REPLACE CRUISE CONTROL MAIN SWITCH

OK

3.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - CRUISE CONTROL MAIN SWITCH)

(a) Disconnect the cruise control switch wire connector from the spiral cable sub-assembly and cruise control main switch.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-1 (ECC) - z3-4 (ECC)

Always

Below 1 Ω

A-4 (CCS) - z3-3 (CCS)

Always

Below 1 Ω

Text in Illustration

*a

Cruise control switch wire

(to Spiral Cable Sub-assembly)

*b

Cruise control switch wire

(to Cruise Control Main Switch)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

NOTICE:

The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may cause airbag deployment. Be sure to read the page shown in the brackets.

(a) Remove the spiral cable with sensor sub-assembly.

Click here 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: REMOVAL

(b) Inspect the spiral cable with sensor sub-assembly.

Click here 2016 - 2020 MY Sienna [12/2015 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: SPIRAL CABLE: INSPECTION

NG

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

OK

5.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY - ECM, BODY GROUND)

(a) Disconnect the D149 spiral cable with sensor sub-assembly (w/ Steering Heater).

(b) Disconnect the D21 spiral cable with sensor sub-assembly (w/o Steering Heater).

(c) Disconnect the A69 ECM connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance (w/ Steering Heater):

Tester Connection

Condition

Specified Condition

D149-1 (CCS) - A69-41 (CCS)

Always

Below 1 Ω

D149-2 (ECC) - Body ground

Always

Below 1 Ω

D149-1 (CCS) or A69-41 (CCS) - Body ground

Always

10 kΩ or higher

Standard Resistance (w/o Steering Heater):

Tester Connection

Condition

Specified Condition

D21-1 (CCS) - A69-41 (CCS)

Always

Below 1 Ω

D21-2 (ECC) - Body ground

Always

Below 1 Ω

D21-1 (CCS) or A69-41 (CCS) - Body ground

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR