Toyota Sienna Service Manual: 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 laser 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 laser cruise control system.
•  The operation of the constant speed control mode is the same as that for a conventional cruise control system.

WIRING DIAGRAM

INSPECTION PROCEDURE

1 READ VALUE OF INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.
2.  Turn the ignition switch to the ON position and turn the intelligent tester main switch on.
3.  Check the DATA LIST for proper functioning of the cruise control main switch.

ECM (Cruise control):

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

Result

2 INSPECT CRUISE CONTROL MAIN SWITCH

1. Remove the cruise control main switch

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

Standard resistance

3 INSPECT HARNESS AND CONNECTOR (CRUISE CONTROL MAIN SWITCH - SPIRAL CABLE)

1. Disconnect the b1 connector from the spiral cable.
2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

4 INSPECT SPIRAL CABLE

NOTICE: The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the page shown in the brackets.

HINT:

•  Removal (34)
•  Installation

1. Remove the spiral cable.
2. Measure the resistance according to the value(s) in the table below.

Standard resistance

HINT: The spiral cable makes a maximum of approximately 5 rotations

5 CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - ECM)

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

Standard resistance

REPLACE ECM