Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: AWD Warning Light does not Come ON

DESCRIPTION

Refer to "AWD Warning Light Remains ON".

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WIRING DIAGRAM

Refer to "AWD Warning Light Remains ON".

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CAUTION / NOTICE / HINT

NOTICE:

When the 4WD ECU assembly is replaced with a known good one from another vehicle, it is necessary to perform calibration.

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HINT:

Check the condition of each related circuit connector before troubleshooting.

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PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output.

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Result

Proceed to

CAN communication system DTCs are not output

A

CAN communication system DTCs are output

B

HINT:

If CAN communication DTCs are output, perform troubleshooting for the CAN communication system first.

B

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

A

2.

INSPECT AWD WARNING

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Four Wheel Drive / Active Test

(f) According to the display on the Techstream, perform the Active Test.

Chassis > Four Wheel Drive > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

4WD Warning Light

AWD warning (multi-information display)

Warning ON/OFF

Observe the multi-information display.

(g) When performing the 4WD Warning Light Active Test, check 4WD Warning Light in the Data List.

Chassis > Four Wheel Drive > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

4WD Warning Light

AWD warning (multi-information display)

ON or OFF

ON: Warning on

OFF: Warning off

-

Chassis > Four Wheel Drive > Active Test

Active Test Display

4WD Warning Light

Data List Display

4WD Warning Light

Result

Proceed to

Data List item 4WD Warning Light does not change according to the operation of the Active Test

A

Data List item 4WD Warning Light changes according to the operation of the Active Test

B

A

REPLACE 4WD ECU ASSEMBLY

B

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

    AWD Warning Light Remains ON
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    DESCRIPTION The 4WD ECU assembly changes the control mode in response to the "Lock Mode" signal from the AWD lock switch (combination switch assembly). WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: ...

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