Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Cruise SET Indicator Light Circuit

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Engine & Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / Cruise SET Indicator Light Circuit

DESCRIPTION

The ECM illuminates the cruise SET indicator by sending request signals to the combination meter assembly via CAN communication. The cruise SET indicator illuminates when the dynamic radar cruise control system is controlling vehicle speed. If the cruise SET indicator is not operating correctly, check for CAN communication DTCs before troubleshooting this circuit.

CAUTION / NOTICE / HINT

CAUTION:

Observe the following items for safety reasons when using the Techstream:

  • Before using the Techstream, read the instruction manual.
  • Prevent the Techstream cable from being caught on the pedals, shift lever or steering wheel when driving with the Techstream connected to the vehicle.
  • When driving the vehicle for testing purposes, 2 people are required. One person should operate the Techstream while the other drives the vehicle.

NOTICE:

  • Before replacing the ECM, refer to Registration.

    Click here

  • 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.

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

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

(e) Perform "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

-
Body Electrical > Combination Meter > Active Test

Tester Display

Meter Display 1

Result

Proceed to

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

A

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

B
B

GO TO METER / GAUGE SYSTEM

A

2.

READ VALUE USING TECHSTREAM

(a) Turn the dynamic radar cruise control system on using the cruise control main switch.

(b) Drive at a speed between approximately 30 km/h (20 mph) and 180 km/h (110 mph).

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

(d) 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

-SET Switch

-SET switch status

OFF or ON

OFF: -SET switch off

ON: -SET switch on

-
Powertrain > Cruise Control > Data List

Tester Display

-SET Switch

Result

Proceed to

The cruise SET indicator illuminates and turns off according to the operation of the -SET switch

A

The cruise SET indicator does not illuminate but the Data List item -SET Switch changes according to the operation of the -SET switch

B

The cruise SET indicator does not illuminate and the Data List item -SET Switch does not change according to the operation of the -SET switch

C
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

B

REPLACE COMBINATION METER ASSEMBLY

C

REPLACE ECM

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