Lexus RX (RX 350L, RX450h) 2016-2026 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 | .gif) | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
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| 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 | - |
| 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
DESCRIPTION The 4WD ECU assembly is connected to the combination meter assembly via CAN communication. If the 4WD ECU assembly stores any DTCs which are related to the dynamic torque control AWD syste ...
AWD Control Switch Circuit
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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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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