Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Engine Switch Illumination Circuit
DESCRIPTION
The illuminated entry system controls the engine switch illumination.
WIRING DIAGRAM
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 / Smart Access / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Smart Access > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Power/Engine SW Light | Engine switch illumination | OFF or ON | When performing this Active Test, make sure the following condition is met: The engine switch illumination is off (15 seconds or more have elapsed since it turned from on to off) and the engine switch is on (ACC) or on (IG), or the engine is running. |
| Tester Display |
|---|
| Power/Engine SW Light |
OK:
Engine switch illumination comes on.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
| 2. | INSPECT ENGINE SWITCH |
(a) Remove the engine switch.
Click here .gif)
(b) Inspect the engine switch.
Click here
OK:
Engine switch illumination is normal.
| NG | | REPLACE PUSH START SWITCH |
|
| 3. | CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) |
(a) Disconnect the J41 certification ECU (smart key ECU assembly) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J14-9 (SWIL) - J41-10 (SWIL) | Always | Below 1 Ω |
| J14-6 (AGND) - J41-11 (AGND) | Always | Below 1 Ω |
| J14-9 (SWIL) or J41-10 (SWIL) - Body ground | Always | 10 kΩ or higher |
| J14-6 (AGND) or J41-11 (AGND) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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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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