Toyota Yaris: Lighting System / Front Fog Light Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the front fog lights.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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-
First, confirm that there is no malfunction in the power integration system. Refer to the How to Proceed with Troubleshooting procedure.
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-
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.
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-
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CXPI communication malfunctions before troubleshooting this symptom.
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PROCEDURE
| 1. | READ VALUE USING GTS |
(a) Turn the light control switch to the TAIL position.
(b) Turn the front fog light switch on.
(c) Using the GTS, read the Data List.
Body Electrical > Power Integration No.1 > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Front Fog Light Fuse Shut Off Status | Front fog light fuse condition | OFF or ON | OFF: Front fog light fuse not shut off ON: Front fog light fuse shut off |
|
| Tester Display |
|---|
| Front Fog Light Fuse Shut Off Status |
OK:
The Data List value displays "OFF".
| NG |
.gif) | GO TO STEP 3 |
|
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| 2. | READ VALUE USING GTS |
(a) Using the GTS, read the Data List.
Body Electrical > Power Integration No.1 > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Front Fog Light Output Signal | Front fog light output | OFF or ON | OFF: Front fog light is not output ON: Front fog light is output |
|
| Tester Display |
|---|
| Front Fog Light Output Signal |
OK:
Display changes according to the front fog light switch operation.
| OK |
| REPLACE SEMICONDUCTOR POWER INTEGRATION ECU |
| NG |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 3. | INSPECT FRONT FOG LIGHT ASSEMBLY LH |
(a) Disconnect the A104 front fog light assembly LH connector.
(b) Turn the front fog light switch off.
(c) Turn the front fog light switch on.
(d) Using the GTS, read the Data List.
Body Electrical > Power Integration No.1 > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Front Fog Light Fuse Shut Off Status | Front fog light fuse condition | OFF or ON | OFF: Front fog light fuse not shut off ON: Front fog light fuse shut off |
|
OK:
The Data List value displays "OFF".
| OK |
| REPLACE FRONT FOG LIGHT ASSEMBLY LH |
|
| 4. | INSPECT FRONT FOG LIGHT ASSEMBLY RH |
(a) Disconnect the A105 front fog light assembly RH connector.
(b) Turn the front fog light switch off.
(c) Turn the front fog light switch on.
(d) Using the GTS, read the Data List.
Body Electrical > Power Integration No.1 > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Front Fog Light Fuse Shut Off Status | Front fog light fuse condition | OFF or ON | OFF: Front fog light fuse not shut off ON: Front fog light fuse shut off |
|
OK:
The Data List value displays "OFF".
| OK |
| REPLACE FRONT FOG LIGHT ASSEMBLY RH |
|
| 5. | CHECK HARNESS AND CONNECTOR |
(a) Disconnect the A104 front fog light assembly LH connector.
(b) Disconnect the A105 front fog light assembly RH connector.
(c) Disconnect the cable from the negative (-) auxiliary battery terminal.
(d) Disconnect the A86 semiconductor power integration computer connector.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A104-2 (B) or A86-18 (L) - Body ground | Always | 10 kΩ or higher |
| A105-2 (B) or A86-17 (L) - Body ground | Always | 10 kΩ or higher |
| OK |
| REPLACE SEMICONDUCTOR POWER INTEGRATION ECU |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
Clearance Light/Daytime Running Light Circuit
DESCRIPTION
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Rear Fog Light Circuit
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CAUTION / NOTICE / HINT NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration...
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WARNING
When removing the fuel-filler cap, loosen the cap slightly and wait for any hissing to stop, then remove it
Fuel spray is dangerous. Fuel can burn skin and eyes and cause illness if ingested. Fuel spray is released when there is pressure in the fuel tank and the fuel-filler cap is removed too quickly.
