Toyota Tundra Service Manual: Cruise Main Indicator Light Circuit

DESCRIPTION

The ECM illuminates the cruise control indicator by sending indicator output demand signals to the combination meter assembly via CAN communication. The cruise control indicator illuminates when the cruise control system is turned on using the cruise control main switch (ON-OFF button). If a malfunction is detected, the cruise control indicator turns off and a warning message is displayed. The cruise control indicator circuit uses CAN communication. If the cruise control indicator is not functioning correctly, check for CAN communication DTCs before troubleshooting this circuit.

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
  • Before replacing the ECM, refer to Registration.

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PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (METER DISPLAY 1)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Combination Meter > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Meter Display 1

Multi-information display

OFF or All

-

Result

Proceed to

The multi-information display in the combination meter assembly turns on or off according to the operation of the Active Test.

A

The multi-information display in the combination meter assembly does not turn on or off according to the operation of the Active Test.

B

B

GO TO METER / GAUGE SYSTEM

A

2.

READ VALUE USING TECHSTREAM (CRUISE READY MAIN-CPU, CRUISE READY SUB-CPU, CRUISE INDICATOR)

(a) Enter the following menus: Powertrain / Cruise Control / Data List.

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

Powertrain > Cruise Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Cruise Ready Main-CPU

Cruise control system standby condition

ON or OFF

Each time cruise control main switch (ON-OFF button) is pushed, ON or OFF changes

-

Cruise Ready Sub-CPU

Cruise control system standby condition

ON or OFF

Each time cruise control main switch (ON-OFF button) is pushed, ON or OFF changes

-

Cruise Indicator

Cruise control indicator status

ON or OFF

ON: Cruise control indicator illuminates

OFF: Cruise control indicator turns off

-

Result

Proceed to

The cruise control indicator illuminates and turns off according to the operation of the cruise control main switch (ON-OFF button).

A

The cruise control indicator does not illuminate but the Data List item Cruise Indicator changes according to the operation of the cruise control main switch (ON-OFF button).

B

The cruise control indicator does not illuminate and the Data List item Cruise Indicator does not change according to the operation of the cruise control main switch (ON-OFF button).

C

A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

B

REPLACE COMBINATION METER ASSEMBLY

C

REPLACE ECM

    Cruise Control Switch Circuit

    Cruise SET Indicator Light Circuit

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