Toyota Tundra Service Manual: Cruise Control Switch Circuit

Toyota Tundra Service Manual / Engine, Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / 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.

    Click here

  • 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.

    Click here

PROCEDURE

1.

READ VALUE ON TECHSTREAM

(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

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:

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

2.

INSPECT CRUISE CONTROL MAIN SWITCH

(a) Remove the cruise control main switch.

Click here

(b) Inspect the cruise control main switch.

Click here

NG

REPLACE CRUISE CONTROL MAIN SWITCH

OK

3.

CHECK CRUISE CONTROL SWITCH WIRE

(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):

Tester Connection

Specified Condition

Cruise control main switch side connector terminal 3 - z2-3

Below 1 Ω

Cruise control main switch side connector terminal 1 - z2-4

Below 1 Ω
NG

REPLACE CRUISE CONTROL SWITCH WIRE

OK

4.

INSPECT SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

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

Click here

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

Click here

NG

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

OK

5.

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

(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):

Tester Connection

Condition

Specified Condition

J45-1 (CCS) - A24-45 (CCS)

Always

Below 1 Ω

J45-2 (ECC) - Body ground

Always

Below 1 Ω

J45-1 (CCS) or A24-45 (CCS) - Body ground

Always

10 kΩ or higher

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

Tester Connection

Condition

Specified Condition

J45-1 (CCS) - A24-60 (CCS)

Always

Below 1 Ω

J45-2 (ECC) - A24-59 (ECCS)

Always

Below 1 Ω

J45-1 (CCS) or A24-60 (CCS) - Body ground

Always

10 kΩ or higher

J45-2 (ECC) - A24-59 (ECCS) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

(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):

Tester Connection

Condition

Specified Condition

J45-2 (ECC) - Body ground

Always

Below 1 Ω

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

Tester Connection

Condition

Specified Condition

D74-81 (E1) - Body ground

Always

Below 1 Ω
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Radar Cruise Control Presence Determination Malfunction (Engine / HV) (C1A52)

    Cruise Main Indicator Light Circuit

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