Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Cornering Light Circuit
DESCRIPTION
The No. 1 headlight ECU sub-assembly controls the cornering 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
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-
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.*
-
Check the fuses for circuits related to this system before performing the following inspection procedure.
- *: for TMMC Made
PROCEDURE
| 1. | CHECK LIGHTS |
(a) Check the illumination of each cornering lights.
| Result | Proceed to |
|---|---|
| LH side cornering light does not illuminate | A |
| RH side cornering light does not illuminate | B |
| B | .gif) | GO TO STEP 9 |
|
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| 2. | 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 4 |
|
| 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 / 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 |
|---|---|---|---|
| Cornering Light | Cornering lights | OFF or ON | - |
| Tester Display |
|---|
| Cornering Light |
OK:
Cornering lights illuminate.
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | GO TO STEP 5 |
| 4. | 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 |
|---|---|---|---|
| Cornering Light | Cornering lights | OFF or ON | - |
| Tester Display |
|---|
| Cornering Light |
OK:
Cornering lights illuminate.
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 5. | CHECK HARNESS AND CONNECTOR (POWER SOURCE - CORNERING LIGHT (FOG LIGHT ASSEMBLY LH)) |
| *a | Front view of wire harness connector (to Cornering Light (Fog Light Assembly LH)) |
(a) Disconnect the A94 cornering light (fog light assembly LH) connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A94-2 (B) - Body ground | Engine switch on (IG) | 11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 6. | CHECK HARNESS AND CONNECTOR (CORNERING LIGHT (FOG LIGHT ASSEMBLY LH) - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A94-4 (E) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 7. | CHECK HARNESS AND CONNECTOR (CORNERING LIGHT (FOG LIGHT ASSEMBLY LH) - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH) |
(a) Disconnect the A49 No. 1 headlight ECU sub-assembly LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A94-3 (CRPL) - A49-9 (CRSL) | Always | Below 1 Ω |
| A94-3 (CRPL) or A49-9 (CRSL) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 8. | INSPECT CORNERING LIGHT (FOG LIGHT ASSEMBLY LH) |
(a) Remove the cornering light (fog light assembly LH).
Click here
(b) Inspect the cornering light (fog light assembly LH).
Click here
| OK | | REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH |
| NG | | REPLACE CORNERING LIGHT (FOG LIGHT ASSEMBLY LH) |
| 9. | 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 11 |
|
| 10. | 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 |
|---|---|---|---|
| Cornering Light | Cornering lights | OFF or ON | - |
| Tester Display |
|---|
| Cornering Light |
OK:
Cornering lights illuminate.
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | GO TO STEP 12 |
| 11. | 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 |
|---|---|---|---|
| Cornering Light | Cornering lights | OFF or ON | - |
| Tester Display |
|---|
| Cornering Light |
OK:
Cornering lights illuminate.
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 12. | CHECK HARNESS AND CONNECTOR (POWER SOURCE - CORNERING LIGHT (FOG LIGHT ASSEMBLY RH)) |
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| *a | Front view of wire harness connector (to Cornering Light (Fog Light Assembly RH)) |
(a) Disconnect the A95 cornering light (fog light assembly RH) connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A95-2 (B) - Body ground | Engine switch on (IG) | 11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 13. | CHECK HARNESS AND CONNECTOR (CORNERING LIGHT (FOG LIGHT ASSEMBLY RH) - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A95-4 (E) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 14. | CHECK HARNESS AND CONNECTOR (CORNERING LIGHT (FOG LIGHT ASSEMBLY RH) - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH) |
(a) Disconnect the A50 No. 1 headlight ECU sub-assembly RH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A95-3 (CRPR) - A50-9 (CRSR) | Always | Below 1 Ω |
| A95-3 (CRPR) or A50-9 (CRSR) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 15. | INSPECT CORNERING LIGHT (FOG LIGHT ASSEMBLY RH) |
(a) Remove the cornering light (fog light assembly RH).
Click here
(b) Inspect the cornering light (fog light assembly RH).
Click here
| OK | | REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH |
| NG | | REPLACE CORNERING LIGHT (FOG LIGHT ASSEMBLY RH) |
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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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