Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Parking Light/Daytime Running Light Circuit
DESCRIPTION
- When the main body ECU (multiplex network body ECU) receives the light control switch position signal, it sends an illumination request signal to the No. 1 headlight ECU sub-assembly and illuminates the parking lights.
- When the operation conditions of the daytime running lights are met, the main body ECU (multiplex network body ECU) sends an illumination request signal to the No. 1 headlight ECU sub-assembly and illuminates the daytime running lights.
WIRING DIAGRAM
for Multiple Beam Headlight
for Single Beam Headlight
CAUTION / NOTICE / HINT
NOTICE:
-
If the No. 1 headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the No. 1 headlight ECU sub-assembly LH.
Click here
.gif)
-
If the headlight assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the No. 1 headlight ECU sub-assembly LH.*
Click here
- When replacing the No. 1 headlight ECU sub-assembly LH, always replace it with a new one. If a No. 1 headlight ECU sub-assembly LH 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.
-
When replacing the headlight assembly LH, always replace it with a new one. If a headlight assembly LH 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.*
- *: for TMMC Made
PROCEDURE
| 1. | CONFIRM MODEL |
(a) Choose the model to be inspected.
| Result | Proceed to |
|---|---|
| for Multiple Beam Headlight | A |
| for Single Beam Headlight | B |
| B | .gif) | GO TO STEP 3 |
|
.gif)
| 2. | 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 / AFS / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > AFS > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Clearance Light | Parking lights | OFF or ON | - |
| Daytime Running Light | Daytime running lights | OFF or ON | This Active Test can only be performed when the customization item DRL function is set to "ON" using the Techstream. |
| Tester Display |
|---|
| Clearance Light |
| Tester Display |
|---|
| Daytime Running Light |
OK:
Parking lights and daytime running lights illuminate.
| Result | Proceed to |
|---|---|
| OK | A |
| NG (LH side parking light and daytime running light does not illuminate) | B |
| NG (RH side parking light and daytime running light does not illuminate) | C |
| A | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| B | | GO TO STEP 4 |
| C | | GO TO STEP 6 |
| 3. | 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 / HL AutoLeveling / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > HL AutoLeveling > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Clearance Light | Parking lights | OFF or ON | - |
| Daytime Running Light | Daytime running lights | OFF or ON | This Active Test can only be performed when the customization item DRL function is set to "ON" using the Techstream. |
| Tester Display |
|---|
| Clearance Light |
| Tester Display |
|---|
| Daytime Running Light |
OK:
Parking lights and daytime running lights illuminate.
| Result | Proceed to |
|---|---|
| OK | A |
| NG (LH side parking light and daytime running light does not illuminate) | B |
| NG (RH side parking light and daytime running light does not illuminate) | C |
| A | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C | | GO TO STEP 6 |
|
| 4. | CHECK HEADLIGHT UNIT LH |
(a) Interchange the headlight unit LH with RH and connect the connectors.
Click here
|
| 5. | CHECK OPERATION (PARKING LIGHTS AND DAYTIME RUNNING LIGHTS) |
(a) Check the operation of the parking lights and daytime running lights.
OK:
The parking lights and daytime running lights operate normally.
| Result | Proceed to |
|---|---|
| OK | A |
| NG (for TMC Made) | B |
| NG (for TMMC Made) | C |
| A | | REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH |
| B | | REPLACE HEADLIGHT UNIT LH |
| C | | REPLACE HEADLIGHT ASSEMBLY LH |
| 6. | CHECK HEADLIGHT UNIT RH |
(a) Interchange the headlight unit RH with LH and connect the connectors.
Click here
|
| 7. | CHECK OPERATION (PARKING LIGHTS AND DAYTIME RUNNING LIGHTS) |
(a) Check the operation of the parking lights and daytime running lights.
OK:
The parking lights and daytime running lights operate normally.
| Result | Proceed to |
|---|---|
| OK | A |
| NG (for TMC Made) | B |
| NG (for TMMC Made) | C |
| A | | REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH |
| B | | REPLACE HEADLIGHT UNIT RH |
| C | | REPLACE HEADLIGHT ASSEMBLY RH |
Headlight Dimmer Switch Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) receives the following switch information:
Light control switch in DRL OFF*1, tail, head, AUTO position
Dimmer switch in high, low or hi ...
Front Fog Light Circuit
DESCRIPTION The main body ECU (multiplex network body ECU) controls the front fog lights. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
Inspect the fuses for circuits related to this system befor ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Lane Control System: Precaution
PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE:
When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. System Name See Procedure Lane Control System Pre-collision ...
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Navigation System: Display Malfunction (B15A6,B15B0)
DESCRIPTION These DTCs are stored when a malfunction occurs in the multi-display assembly. DTC No. Detection Item DTC Detection Condition Trouble Area B15A6 Display Malfunction When any of the following conditions is met:
RAM error
Drawing controller malfunction
Internal hard ...
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
0.0109