Lexus ES: High Beam Headlight Circuit
DESCRIPTION
The headlight ECU sub-assembly controls the high beam headlights.
WIRING DIAGRAM
except Bulb Type Turn Signal Light (for TMMK Made)
for Bulb Type Turn Signal Light (for TMMK Made)
CAUTION / NOTICE / HINT
NOTICE:
-
If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.*1
Click here
.gif)
-
If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.*2
Click here
-
If the headlight assembly LH has been replaced, it is necessary to synchronize the vehicle information the headlight ECU sub-assembly LH.*3
Click here
-
When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a 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.
- *1: for LED Type Turn Signal Light
- *2: for Bulb Type Turn Signal Light
- *3: for Bulb Type Turn Signal Light (for TMMK Made)
PROCEDURE
| 1. | CONFIRM MODEL |
(a) Choose the model to be inspected.
| Result | Proceed to |
|---|---|
| for LED Type Turn Signal Light | A |
| for Bulb Type Turn Signal Light | B |
| B | .gif) | GO TO STEP 5 |
|
.gif)
| 2. | CHECK LIGHTS |
(a) Check the illumination of each high beam lights.
| Result | Proceed to |
|---|---|
| LH side high beam light does not illuminate | A |
| RH side high beam light does not illuminate | 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 |
|---|---|---|---|
| Headlight High Beam | High beam headlights | OFF or ON | - |
| Tester Display |
|---|
| Headlight High Beam |
OK:
High beam headlight turn on.
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | GO TO STEP 7 |
| 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 / AFS (Sub) / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > AFS (Sub) > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Headlight High Beam | High beam headlights | OFF or ON | - |
| Tester Display |
|---|
| Headlight High Beam |
OK:
High beam headlight turn on.
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | GO TO STEP 12 |
| 5. | CHECK LIGHTS |
(a) Check the illumination of each high beam lights.
| Result | Proceed to |
|---|---|
| LH side high beam light does not illuminate | A |
| RH side high beam light does not illuminate | B |
| B | | GO TO STEP 11 |
|
| 6. | 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 |
|---|---|---|---|
| Headlight High Beam | High beam headlights | OFF or ON | - |
| Tester Display |
|---|
| Headlight High Beam |
OK:
High beam headlight turn on.
| Result | Proceed to |
|---|---|
| OK | A |
| NG (for TMC Made) | B |
| NG (for TMMK Made) | C |
| A | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C | | GO TO STEP 9 |
|
| 7. | CHECK HEADLIGHT UNIT ASSEMBLY LH |
(a) Interchange the headlight unit assembly LH with RH and connect the connectors.
for LED Type Turn Signal Light: Click here
for Bulb Type Turn Signal Light: Click here
|
| 8. | CHECK OPERATION (HIGH BEAM HEADLIGHT) |
(a) Check that the high beam headlight operates normally.
OK:
High beam headlight operates normally.
| OK | | REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH |
| NG | | REPLACE HEADLIGHT UNIT ASSEMBLY LH |
| 9. | CHECK HEADLIGHT ASSEMBLY LH |
(a) Remove each headlight ECU sub-assembly, interchange the headlight assembly LH with RH and connect the connectors.
Click here
|
| 10. | CHECK OPERATION (HIGH BEAM HEADLIGHT) |
(a) Check that the high beam headlight operates normally.
OK:
High beam headlight operates normally.
| OK | | REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH |
| NG | | REPLACE HEADLIGHT ASSEMBLY LH |
| 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 (Sub) / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > HL AutoLeveling (Sub) > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Headlight High Beam | High beam headlights | OFF or ON | - |
| Tester Display |
|---|
| Headlight High Beam |
OK:
High beam headlight turn on.
| Result | Proceed to |
|---|---|
| OK | A |
| NG (for TMC Made) | B |
| NG (for TMMK Made) | C |
| A | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C | | GO TO STEP 14 |
|
| 12. | CHECK HEADLIGHT UNIT ASSEMBLY RH |
(a) Interchange the headlight unit assembly RH with LH and connect the connectors.
for LED Type Turn Signal Light: Click here
for Bulb Type Turn Signal Light: Click here
|
| 13. | CHECK OPERATION (HIGH BEAM HEADLIGHT) |
(a) Check that the high beam headlight operates normally.
OK:
High beam headlight operates normally.
| OK | | REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH |
| NG | | REPLACE HEADLIGHT UNIT ASSEMBLY RH |
| 14. | CHECK HEADLIGHT ASSEMBLY RH |
(a) Remove each headlight ECU sub-assembly, interchange the headlight assembly RH with LH and connect the connectors.
Click here
|
| 15. | CHECK OPERATION (HIGH BEAM HEADLIGHT) |
(a) Check that the high beam headlight operates normally.
OK:
High beam headlight operates normally.
| OK | | REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH |
| NG | | REPLACE HEADLIGHT ASSEMBLY RH |
READ NEXT:
Precaution
PRECAUTION PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL NOTICE: When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following s
Parts Location
PARTS LOCATION ILLUSTRATION *1 SIDE TURN SIGNAL LIGHT ASSEMBLY LH *2 SIDE TURN SIGNAL LIGHT ASSEMBLY RH *3 HEADLIGHT ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT UNIT ASSEMB
SEE MORE:
Rear Power Window LH does not Operate with Rear Power Window Switch LH
DESCRIPTION When the power switch is on (IG), the power window regulator motor assembly (for rear LH door) is operated by the rear power window regulator switch assembly (for LH door). The power window regulator motor assembly (for rear LH door) has motor, regulator, and ECU functions. WIRING DIAGRA
Parts Location
PARTS LOCATION ILLUSTRATION *1 DEF RELAY *2 REAR WINDOW DEFOGGER WIRE *3 NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - DEF FUSE *4 BACK WINDOW GLASS ILLUSTRATION *1 REAR WINDOW DEFOGGER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) *2 DLC3 *3 A
