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Confirm problem symptoms
Check the functions for which the problem symptoms occur. (Navigation function, audio function etc.)
If the malfunction occurs for radio, there is a high chance of the malfunction being caused by external factors.
If the malfunction occurs depending on the location, consider transmission lines, overhead wires, neon signs, trucks or motorcycles, wireless transmissions from vehicles, buildings, etc., as the cause.
If the malfunction occurs depending on the channel (broadcast station), consider excessively strong radio waves, excessively weak radio waves, poor quality signal, unstable signal, etc., as the cause.
If the malfunction occurs when playing a CD/DVD/Blu-ray disc, there is a high chance of the malfunction being caused by the media or media format. In this situation, check with the customer the conditions when the malfunction occurred in accordance with the interview sheet.
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Measure the auxiliary battery voltage with the ignition switch off.
11 to 14 V
Visually inspect for blown fuses, an open or short in a wire harness or improperly connected connectors, etc.
Not abnormal
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Check that condensation is not likely to occur in the cabin and that the temperature is not -20°C (-4°F) or lower, or 65°C (149°F) or higher.
A humid cabin and a rapid change in temperature may lead to condensation. Condensation in the cabin may cause a short circuit.
The navigation system may not operate normally when the temperature is -20°C (-4°F) or lower, or 65°C (149°F) or higher.
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Refer to Check System Normal Condition.
| Result | Proceed to |
|---|---|
| Symptom is not normal operation | A |
| Symptom is normal operation | B |
A
B
Using the GTS, select "Communication Bus Check" and check that all ECUs and sensors connected to the CAN communication system are displayed on the screen.
| Result | Proceed to |
|---|---|
| CAN DTCs are not output | A |
| CAN DTCs are output | B |
A
B
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Using the GTS, check for DTCs.
Check for DTCs.
Record the results of any DTCs (latest/confirmed)
Check the freeze frame data for both latest DTCs and confirmed DTCs.
If freeze frame data is stored, a snow icon is displayed to the left.
| Item | Details |
|---|---|
| Latest DTC | Indicates the latest malfunction judgment results during the current trip |
| Confirmed DTC | Indicates DTCs that have been confirmed |
Clear the DTCs.
Recheck for DTCs.
Based on the detection conditions of the DTCs, simulate the malfunction conditions and check if the DTCs are output again.
| Result | Proceed to |
|---|---|
| DTCs are not output (symptoms can be confirmed or reproduced) | A |
| DTCs are not output (symptoms cannot be confirmed or reproduced) | B |
| DTCs are output | C |
A
B
C
Using the GTS, check for vehicle control history (RoB).
| Tester Display |
|---|
| Vehicle Control History (RoB) |
If vehicle control history (RoB) is output, record it.
| Result | Proceed to |
|---|---|
| Vehicle control history (RoB) is not output | A |
| Vehicle control history (RoB) is output | B |
A
B
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
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Depending on the parts that are replaced, performing software update, initialization, registration or calibration may be needed.
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