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 > Cooling Fan System: Cooling Fan Circuit
DESCRIPTION The ECM calculates an appropriate cooling fan speed based on the engine coolant temperature, air conditioning switch condition, refrigerant pressure, engine speed and vehicle speed. The cooling fan ECUs control each cooling fan speed based on the duty cycle calculated by the ECM. By opti ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Intake System: On-vehicle Inspection
ON-VEHICLE INSPECTION CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced when repairing air leaks in the intake system are shown below. Necessary Procedures After Parts R ...