Toyota Tundra Service Manual: Cruise Control Switch Circuit

DESCRIPTION

The cruise control main switch is used to turn the dynamic radar cruise control system on and off, as well as operate 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP and CANCEL.

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 contains momentary type contacts for each function. The contacts close only while the cruise control main switch is being operated in the direction of the relative function arrow, and open when the cruise control main switch is released. The voltage at the terminal of the hybrid vehicle control ECU assembly changes as each of the different contacts open or close. The hybrid vehicle control ECU assembly reads this voltage and controls the SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL functions accordingly.

• Vehicle-to-vehicle distance control mode is selected by default when the dynamic radar cruise control system is turned on using the cruise control main switch (ON-OFF button).
• The operation of constant speed control mode is the same as that for a conventional cruise control system.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• Before replacing the ECM, refer to Registration.

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• The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

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PROCEDURE

(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 Cruise1 / Data List.

(e) Read the Data List according to the display on the Techstream.

Powertrain > Radar Cruise1 > Data List

OK:

The Data List items shown in the table change according to the operation of the cruise control main switch.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

(a) Remove the cruise control main switch.

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(b) Inspect the cruise control main switch.

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NG

REPLACE CRUISE CONTROL MAIN SWITCH

OK

(a) Remove the cruise control switch wire. Click here

*1 Cruise Control Switch Wire *a Front view of wire harness connector (to Spiral Cable with Sensor Sub-assembly) *b Front view of wire harness connector (to Cruise Control Main Switch)

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

Standard Resistance (Check for Open):

NG

REPLACE CRUISE CONTROL SWITCH WIRE

OK

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

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

Click here

NG

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

OK

(a) Disconnect the J45 spiral cable with sensor sub-assembly connector.

(b) Disconnect the A24 ECM connector.

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

Standard Resistance (1UR-FE):

Standard Resistance (3UR-FE, 3UR-FBE):

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) for 1UR-FE:

Disconnect the J45 spiral cable with sensor sub-assembly connector.

(b) for 3UR-FE, 3UR-FBE:

Disconnect the D74 ECM connector.

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

Standard Resistance (for 1UR-FE):

Standard Resistance (for 3UR-FE, 3UR-FBE):

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR