Toyota Sienna Service Manual: How to proceed with troubleshooting

Toyota Sienna Service Manual / Navigation / Navigation system / How to proceed with troubleshooting

1 VEHICLE BROUGHT INTO A WORKSHOP

2 DIAGNOSTIC QUESTIONING AND SYMPTOM CONFIRMATION

Ask the customer about symptoms and confirm malfunctions.

3 CONFIRM THE SYSTEM NORMAL CONDITION

4 CHECK DTC

HINT: If the system cannot enter the diagnosis mode, inspect each AVC-LAN communication signal and repair or replace problem parts.

5 DTC CLEAR

Clear the DTCs and finish the diagnostic mode.

HINT: The currently output DTCs may not indicate actual malfunctions depending on the vehicle conditions.

6 RECHECK DTC

HINT:

If the system cannot enter the diagnosis mode, inspect the AVC-LAN and all the components that connect to the AVCLAN for short circuits.
Even if the malfunction symptom is not confirmed, check for diagnostic trouble codes. This is because the system stores past diagnostic trouble codes.
Refer to the detailed description on the diagnostic screen, as necessary.
Check the diagnostic trouble code and inspect the area the code indicates.

7 DIAGNOSTIC TROUBLE CODE CHART

Find the output code on the diagnostic trouble code chart.

8 PROBLEM SYMPTOMS TABLE

Find the applicable symptom code in the problem symptoms table.

HINT: If the symptom does not recur and no code is output, perform the symptom reproduction method

9 CHECK THE ECU TERMINAL ARRANGEMENT BASED ON THE MALFUNCTION SYMPTOM

10 CHECK THE CIRCUIT

Adjust, repair, or replace as necessary.

11 RECHECK THE DIAGNOSTIC TROUBLE CODE

HINT: After deleting the DTCs, recheck for diagnostic trouble codes.

12 PERFORM CONFIRMATION TEST

END

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