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Use the following procedure to troubleshoot the window defogger system.
*: Use the GTS.
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In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
The following 5 items are important points for problem analysis:
| What | Vehicle model, system name |
| When | Date, time, occurrence frequency |
| Where | Road conditions |
| Under what conditions? | Driving conditions, weather conditions |
| How did it happen? | Problem symptoms |
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Measure the battery voltage with ignition switch off.
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
Check the fuses and relays.
Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.
Using the GTS, check the electric power control system's load control history.*
*: for Automatic Air Conditioning System
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Refer to Problem Symptoms Table.
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| Fault is not listed in Problem Symptoms Table. |
| Fault is listed in Problem Symptoms Table. |
Fault is not listed in Problem Symptoms Table.
Fault is listed in Problem Symptoms Table.
*: for Automatic Air Conditioning System
Data List / Active Test*
On-vehicle Inspection
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Repair or replace as necessary.
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