How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2009 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

VEHICLE BROUGHT TO WORKSHOP
INSPECT BATTERY VOLTAGE
Standard voltage: 11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding.

BASIC INSPECTION

Turn the ignition switch to ON.
Check whether or not the radio receiver turns on.

Result

RESULT CHART

Result	Proceed to
Radio receiver turns on	A
Radio receiver does not turn on	B

B: Go to step 7

A: Go to Next Step

CONFIRM MODEL

Result

RESULT CHART

Result	Proceed to
for 8 Speakers	A
Except for 8 Speakers	B

B: Go to step 7

A: Go to Next Step

CHECK FOR DTC

Check for DTCs and note any codes that are output.
Clear the DTCs.
Recheck for DTCs by simulating the operation indicated by the DTCs.
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 malfunctioning part.
- Even if the symptom malfunction is not confirmed, check the DTCs. This is because the system stores past DTCs.
- Check and clear past DTCs. Then recheck for DTCs.

Result

RESULT CHART

Result	Proceed to
DTC is output again	A
DTC is not output	B

B: Go to step 7

A: Go to Next Step

DIAGNOSTIC TROUBLE CODE CHART
Find the output code in the Diagnostic Trouble Code Chart (See DIAGNOSTIC TROUBLE CODE CHART ).

NEXT: Go to step 9

PROBLEM SYMPTOMS TABLE

Refer to the Problem Symptoms Table (See PROBLEM SYMPTOMS TABLE ).

Result

RESULT CHART

Result	Proceed to
Fault is not listed In problem symptoms table	A
Fault is listed In problem symptoms table	B

B: Go to step 9

A: Go to Next Step

OVERALL ANALYSIS AND TROUBLESHOOTING
1. Terminals of ECU (See TERMINALS OF ECU ).
ADJUST, REPAIR OR REPLACE
CONFIRMATION TEST
NEXT: END