Toyota Corolla Cross: Front Side Marker Light Circuit
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 headlight ECU sub-assembly LH/RH to illuminate the front side marker lights.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the bulbs for circuits related to this system before performing the following procedure.
- 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.
Click here
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PROCEDURE
|
1. | CHECK LIGHTS |
(a) Check the illumination of each front side marker light.
|
Result | Proceed to |
|---|---|
|
LH side front side marker light does not illuminate |
A |
| RH side front side marker light does not illuminate |
B |
| B |
.gif) | GO TO STEP 5 |
|
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| 2. |
PERFORM ACTIVE TEST USING GTS |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Headlight Control > Active Test|
Tester Display | Measurement Item |
Control Range | Diagnostic Note |
|---|---|---|---|
|
Clearance Light (+ Front Side Marker Light) |
Parking lights and side marker lights |
OFF or ON | - |
|
Tester Display |
|---|
| Clearance Light (+ Front Side Marker Light) |
OK:
Front side marker light illuminates.
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
|
| 3. |
CHECK HEADLIGHT UNIT ASSEMBLY LH |
(a) Interchange the headlight unit assembly LH with RH and connect the connectors.
Click here
|
| 4. |
CHECK OPERATION (FRONT SIDE MARKER LIGHT) |
(a) Check the operation of front side marker light.
|
Result | Proceed to |
|---|---|
|
LH side front side marker light does not illuminate |
A |
| RH side front side marker light does not illuminate |
B |
| A |
| REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH |
| B |
| REPLACE HEADLIGHT UNIT ASSEMBLY LH
|
| 5. |
PERFORM ACTIVE TEST USING GTS |
(a) Perform the Active Test according to the display on the GTS.
Body Electrical > Headlight Control (Sub) > Active Test|
Tester Display | Measurement Item |
Control Range | Diagnostic Note |
|---|---|---|---|
|
Clearance Light (+ Front Side Marker Light) |
Parking lights and side marker lights |
OFF or ON | - |
|
Tester Display |
|---|
| Clearance Light (+ Front Side Marker Light) |
OK:
Front side marker light illuminates.
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
|
| 6. |
CHECK HEADLIGHT UNIT ASSEMBLY RH |
(a) Interchange the headlight unit assembly RH with LH and connect the connectors.
Click here
|
| 7. |
CHECK OPERATION (FRONT SIDE MARKER LIGHT) |
(a) Check the operation of front side marker light.
|
Result | Proceed to |
|---|---|
|
RH side front side marker light does not illuminate |
A |
| LH side front side marker light does not illuminate |
B |
| A |
| REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH |
| B |
| REPLACE HEADLIGHT UNIT ASSEMBLY RH
|
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