Toyota Yaris: Lighting System / Rear Fog Light Circuit
DESCRIPTION
The main body ECU (multiplex network body ECU) controls the rear fog light.
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 rear fog light switch on.
(c) Using the GTS, read the Data List.
Body Electrical > Power Distribution Box > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Rear Fog Light Fuse Shut Off Status | Rear fog light fuse condition | OFF or ON | OFF: Rear fog light fuse not shut off ON: Rear fog light fuse shut off | - |
| Tester Display |
|---|
| Rear 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 Distribution Box > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Rear Fog Light Output Signal | Rear fog light output | OFF or ON | OFF: Rear fog light is not output ON: Rear fog light is output | - |
| Tester Display |
|---|
| Rear Fog Light Output Signal |
OK:
Display changes according to the rear fog light switch operation.
| OK |
| REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
| NG |
| REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 3. | INSPECT REAR FOG LIGHT ASSEMBLY |
(a) Disconnect the W8 rear fog light LED connector.
(b) Turn the rear fog light switch off.
(c) Turn the rear fog light switch on.
(d) Using the GTS, read the Data List.
Body Electrical > Power Distribution Box > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Rear Fog Light Fuse Shut Off Status | Rear fog light fuse condition | OFF or ON | OFF: Rear fog light fuse not shut off ON: Rear fog light fuse shut off | - |
OK:
The Data List value displays "OFF".
| OK |
| REPLACE REAR FOG LIGHT ASSEMBLY |
|
| 4. | CHECK HARNESS AND CONNECTOR |
(a) Disconnect the W8 rear fog light LED connector.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal.
(c) Disconnect the 4E power distribution box assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| W8-2 (B) or 4E-7 - Body ground | Always | 10 kΩ or higher |
| OK |
| REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
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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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Fuel Gauge
The fuel gauge shows approximately how much fuel is remaining in the tank when the ignition is switched ON. We recommend keeping the tank over 1/4 full.
