Diagnosis Flowchart - Pioneer Service Manual

5

5.2 DIAGNOSIS FLOWCHART

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- How to detect the cause of the trouble involving the PND unit and the Main unit
If the Main unit returns to the normal operation after replacing the PND unit, the PND unit is defective, basically.
If the Main unit returns to the normal operation after replacing the Main unit, the Main unit is defective.
The cases are shown as in the following.
[Case] When the PND unit and Main unit do not start;
• Connect only PND unit to PC to check if the PND unit starts up by pressing the power switch.
-> When the PND unit starts up, the Main unit is defective.
-> When the PND unit does not start up, the PND unit is defective.
[Case] When the source sound is not generated;
-> The Main unit is defective.
[Case] When the guide sound is not generated;
• Replace the PND unit to check if the sound is generated.
-> When the sound is generated, the PND unit is defective.
-> When the sound is not generated, the Main unit is defective.
[Case] When RGB_LED does not light up;
• Replace the PND unit to check if it lights up.
-> When it lights up, the PND unit is defective.
-> When it does not light up, the Main unit is defective.
- How to detect the cause of the trouble involving the GPS IF unit
[Case] When TMC signal became unreceivable;
• Replace the TMC unit to check if it becomes receivable via the air.
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-> When receivable, the TMC unit is defective.
-> When not receivable, check if the P901on the main unit is damaged.
• If the P901on the main unit mentioned above is;
-> Damaged, replace the fuse.
-> Not damaged, connect the TMC to check the high-side switch output of the GPS IF unit.
• If the voltage of the high-side switch output mentioned above is;
-> not 14.4 V, the GPS IF unit is defective.
-> 14.4 V, the PND unit is defective.
[Case] When GPS became unreceivable;
• Replace the GPS antenna to check if it becomes receivable.
-> If the GPS is receivable, the GPS antenna is defective.
-> If the GPS is unreceivable, replace the PND unit to check if the GPS becomes receivable.
• If the GPS becomes;
-> Receivable, the PND unit is defective.
-> Unreceivable, the GPS IF unit is defective.
[Reference] How to operate the Main unit without PND unit
1. Connect the sensing pin "DSENS" in the main unit to the GND.
2. Discharge BUP sufficiently before pressing the "Eject" button to start the Main unit.(RGB_LED blinks.)
[Reference] How to check the battery.
1. Charge the battery fully.
2. Start only PND unit to measure the duration of time until each Caution indicated below appears.
3. Compare the measured duration times with the Table 1.
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