Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Ambient Illumination Light Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the ambient illumination lights.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the lights for circuits related to this system before performing the following procedure.
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
.gif)
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 / Main Body / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Main Body > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Interior Illumination Light1 | Instrument panel ambient illumination light | ON or OFF | Preconditions for using the Active Test to check dimmer controlled illumination:
|
| Interior Illumination Light2 | Door ambient illumination light | ON or OFF | Preconditions for using the Active Test to check dimmer controlled illumination:
|
| Tester Display |
|---|
| Interior Illumination Light1 |
| Tester Display |
|---|
| Interior Illumination Light2 |
OK:
Instrument panel ambient illumination light and door ambient illumination lights comes on.
| Result | Proceed to |
|---|---|
| OK | A |
| NG (All ambient lights do not illuminate) | B |
| NG (Instrument panel ambient illumination light does not illuminate) | C |
| NG (Door ambient illumination light does not illuminate) | D |
| A | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C | | GO TO STEP 4 |
| D | | GO TO STEP 7 |
|
.gif)
| 2. | CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 2E instrument panel junction block assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 2E-1 - Body ground | Always | 11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Disconnect the 2B instrument panel junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
.png)
| *a | Component without harness connected (Instrument Panel Junction Block Assembly) | - | - |
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 2E-1 - 2B-24 | Always | Below 1 Ω |
| 2E-1 - 2B-25 | Always | Below 1 Ω |
| 2E-1 - 2B-27 | Always | Below 1 Ω |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
| 4. | INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Disconnect the 2B and 2E instrument panel junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
| *a | Component without harness connected (Instrument Panel Junction Block Assembly) | - | - |
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 2E-1 - 2B-24 | Always | Below 1 Ω |
| NG | | REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
|
| 5. | CHECK HARNESS AND CONNECTOR (INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the K10 interior illumination light sub-assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| K10-2 - 2B-24 | Always | Below 1 Ω |
| K10-2 or 2B-24 - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 6. | CHECK HARNESS AND CONNECTOR (INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Disconnect the J9 main body ECU (multiplex network body ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| K10-1 - J9-21 (LED1) | Always | Below 1 Ω |
| K10-1 or J9-21 (LED1) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 7. | INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Disconnect the 2B and 2E instrument panel junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
| *a | Component without harness connected (Instrument Panel Junction Block Assembly) | - | - |
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 2E-1 - 2B-25 | Always | Below 1 Ω |
| 2E-1 - 2B-27 | Always | Always |
| NG | | REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
|
| 8. | CHECK HARNESS AND CONNECTOR (DOOR TRIM BOARD SUB-ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the M12 front door trim board sub-assembly RH connector.
(b) Disconnect the N12 front door trim board sub-assembly LH connector.
(c) Disconnect the Q5 rear door trim board sub-assembly RH connector.
(d) Disconnect the Q6 rear door trim board sub-assembly LH connector.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| M12-1 - 2B-27 | Always | Below 1 Ω |
| M12-1 or 2B-27 - Body ground | Always | 10 kΩ or higher |
| Q5-1 - 2B-27 | Always | Below 1 Ω |
| Q5-1 or 2B-27 - Body ground | Always | 10 kΩ or higher |
| N12-1 - 2B-25 | Always | Below 1 Ω |
| N12-1 or 2B-25 - Body ground | Always | 10 kΩ or higher |
| Q6-1 - 2B-25 | Always | Below 1 Ω |
| Q6-1 or 2B-25 - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 9. | CHECK HARNESS AND CONNECTOR (DOOR TRIM BOARD SUB-ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Disconnect the J9 main body ECU (multiplex network body ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| M12-2 - J9-22 (LED2) | Always | Below 1 Ω |
| M12-2 or J9-22 (LED2) - Body ground | Always | 10 kΩ or higher |
| Q5-2 - J9-22 (LED2) | Always | Below 1 Ω |
| Q5-2 or J9-22 (LED2) - Body ground | Always | 10 kΩ or higher |
| N12-2 - J9-22 (LED2) | Always | Below 1 Ω |
| N12-2 or J9-22 (LED2) - Body ground | Always | 10 kΩ or higher |
| Q6-2 - J9-22 (LED2) | Always | Below 1 Ω |
| Q6-2 or J9-22 (LED2) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Instrument Panel Box Light and Footwell Light Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the instrument panel box light and footwell light. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Before replacing the main body EC ...
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) ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Rear Combination Light Assembly (w/o Rear No. 2 Seat): Components
COMPONENTS ILLUSTRATION *A except TMMC Made *B for TMMC Made *C for LH Side - - *1 DECK BOARD ASSEMBLY *2 DECK SIDE TRIM BOX RH *3 FRONT DECK FLOOR BOX *4 REAR DECK FLOOR BOX *5 REAR FLOOR FINISH PLATE *6 REAR NO. 3 FLOOR BOARD *7 REAR NO. 4 FL ...
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Panoramic View Monitor System: ECU Power Source Circuit
DESCRIPTION This circuit is the power source circuit to operate the parking assist ECU. The parking assist ECU controls the panoramic view monitor system. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuse for circuits related to this system before performing the following inspection p ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
0.0139