How to Proceed With Troubleshooting

NAVIGATION: NAVIGATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

HINT
Use the following procedure to troubleshoot the navigation system.

1. VEHICLE BROUGHT TO WORKSHOP

NEXT -- Continue to next step.

2. CUSTOMER PROBLEM ANALYSIS

* When 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 in problem analysis:





NEXT -- Continue to next step.

3. INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard voltage:

11 to 14 V

HINT
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

NEXT -- Continue to next step.

4. CHECK CABIN

(a) Check that condensation is not likely to occur in the cabin, and that the temperature is not high or extremely low in the cabin.

OK:

Condensation is not likely being produced and the temperature is not high or extremely low.

HINT
* 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.

NG -- SET CABIN TO APPROPRIATE TEMPERATURE
OK -- Continue to next step.

5. CHECK NAVIGATION SYSTEM NORMAL CONDITION

(a) Refer to Check System Normal Condition Operation Check.

Result





B -- SYMPTOM IS NORMAL OPERATION
A -- Continue to next step.

6. CHECK FOR DTC

(a) Refer to DTC Check/Clear Reading and Clearing Diagnostic Trouble Codes.

Result





HINT
If the system cannot enter diagnostic mode, inspect the AVC-LAN and all the components that connect to the AVC-LAN for short circuits and repair or replace the problem part AVC-LAN Circuit.

B -- Go to step 10
A -- Continue to next step.

7. DTC CLEAR

(a) Refer to DTC Check/Clear Reading and Clearing Diagnostic Trouble Codes.

HINT
The present DTCs may not indicate actual malfunctions depending on the vehicle operating conditions.

NEXT -- Continue to next step.

8. RECHECK FOR DTC

(a) Refer to DTC Check/Clear Reading and Clearing Diagnostic Trouble Codes.

Result





HINT
* Even if the malfunction symptom is not confirmed, check for DTCs. This is because the system stores history DTCs.
* If more information is needed, perform a recheck using the "System Check Mode" screen after rechecking for DTCs using the Techstream.
* Check the DTCs and inspect the area that the code indicates.

B -- Go to step 10
A -- Continue to next step.

9. DIAGNOSTIC TROUBLE CODE CHART

(a) Find the output code in Diagnostic Trouble Code Chart Navigation System.

NEXT -- Go to step 12

10. PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table Problem Symptoms Table.

Result





HINT
If the symptom does not recur and no DTCs are output, attempt to reproduce the symptoms How To Proceed With Troubleshooting.

B -- Go to step 12
A -- Continue to next step.

11. PERFORM TROUBLESHOOTING BASED ON MALFUNCTION SYMPTOM

(a) Refer to Terminals of ECU Pinout Values and Diagnostic Parameters.

NEXT -- Continue to next step.

12. CHECK CIRCUIT

(a) Adjust, repair or replace as necessary.

NEXT -- Continue to next step.

13. RECHECK FOR DTC*

(a) After clearing DTCs, recheck for DTCs.

NEXT -- Continue to next step.

14. PERFORM CONFIRMATION TEST

NEXT -- END