DESCRIPTION
When the light control switch is in the tail or head position, the main body ECU (multiplex network body ECU) sends an illumination request signal to the No. 1 headlight ECU sub-assembly to illuminate the front side marker lights.
WIRING DIAGRAM
for Multiple Beam Headlight
for Single Beam Headlight
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
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 | ![]() | GO TO STEP 3 |
|
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 | - |
Tester Display |
---|
Clearance Light |
OK:
Front side marker light illuminate.
Result | Proceed to |
---|---|
OK | A |
NG (LH side front side marker light does not illuminate) | B |
NG (RH side front side marker 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 | - |
Tester Display |
---|
Clearance Light |
OK:
Front side marker light illuminate.
Result | Proceed to |
---|---|
OK | A |
NG (LH side front side marker light does not illuminate) | B |
NG (RH side front side marker 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 (FRONT SIDE MARKER LIGHT) |
(a) Check that the front side marker light operates normally.
OK:
Front side marker light operates 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 (FRONT SIDE MARKER LIGHT) |
(a) Check that the front side marker light operates normally.
OK:
Front side marker light operates 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 |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Headlight Assembly: Repair
REPAIR CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
If the installation area of the headlight assembly is damaged, use a supply retainer for a low-cost repair.
Ensure that the headlight assembly is not damaged. ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Automatic Transaxle Unit: Inspection
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