Use the following procedure to troubleshoot the automatic high beam 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 auxiliary battery voltage with the ignition switch off.
11 to 14 V
If the voltage is below 11 V, recharge or replace the auxiliary 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.
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Using the GTS, check for CAN communication system DTCs.
| Result | Proceed to |
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| CAN DTCs are not output | A |
| CAN DTCs are output | B |
A
B
Check for DTCs.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
A
B
Using the GTS, check for Vehicle Control History (RoB).
| Tester Display |
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| Vehicle Control History (RoB) |
Make sure to record the output Vehicle Control History.
| Result | Proceed to |
|---|---|
| Vehicle Control History codes are not output | A |
| Vehicle Control History code X2020 and/or X204D is output | B |
| Vehicle Control History codes other than X2020 and X204D are output | C |
A
B
C
Refer to Problem Symptoms Table.
| Result | Proceed to |
|---|---|
| Fault is not listed in Problem Symptoms Table | A |
| Fault is listed in Problem Symptoms Table | B |
A
B
On-vehicle Inspection.
Inspection.
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Clear Vehicle Control History
| Tester Display |
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| Vehicle Control History (RoB) |
Check Vehicle Control History
| Tester Display |
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| Vehicle Control History (RoB) |
| Result | Proceed to |
|---|---|
| Vehicle Control History (RoB) codes are not output | A |
| Vehicle Control History (RoB) codes are output | B |
A
B