POWER SUPPLY AND GROUND CIRCUIT
AUDIO UNIT
AUDIO UNIT : Diagnosis Procedure
Regarding Wiring Diagram information, refer to AV-27, "Wiring Diagram".
1.CHECK FUSE
Check that the following fuses are not blown.

Are the fuses blown? YES >> Replace the blown fuse after repairing the affected circuit.
NO >> GO TO 2.
2.CHECK POWER SUPPLY CIRCUIT

Is the inspection result normal? YES >> GO TO 3.
NO >> Repair or replace harness or connectors.
3.CHECK GROUND CIRCUIT

Is the inspection result normal? YES >> Inspection End.
NO >> Repair or replace harness or connectors.
FRONT TWEETER
Diagnosis Procedure
Regarding Wiring Diagram information, refer to AV-27, "Wiring Diagram".
1.CONNECTOR CHECK
Check the audio unit and speaker connectors for the following:
Is the inspection result normal? YES >> GO TO 2.
NO >> Repair the terminals or connectors.
2.CHECK FRONT TWEETER SIGNAL CIRCUIT CONTINUITY


Is the inspection result normal? YES >> GO TO 3.
NO >> Repair or replace harness or connectors.
3.CHECK FRONT TWEETER SIGNAL


Is the inspection result normal? YES >> Replace front tweeter. Refer to AV-66, "Removal and Installation".
NO >> Replace audio unit. Refer to AV-64, "Removal and Installation".
FRONT DOOR SPEAKER
Diagnosis Procedure
Regarding Wiring Diagram information, refer to AV-27, "Wiring Diagram".
1.CONNECTOR CHECK
Check the audio unit and speaker connectors for the following:
Is the inspection result normal? YES >> GO TO 2.
NO >> Repair the terminals or connectors.
2.CHECK FRONT DOOR SPEAKER SIGNAL CIRCUIT CONTINUITY


Is the inspection result normal? YES >> GO TO 3.
NO >> Repair or replace harness or connectors.
3.CHECK FRONT DOOR SPEAKER SIGNAL


Is the inspection result normal? YES >> Replace front door speaker. Refer to AV-67, "Removal and Installation".
NO >> Replace audio unit. Refer to AV-64, "Removal and Installation".
REAR DOOR SPEAKER
Diagnosis Procedure
Regarding Wiring Diagram information, refer to AV-27, "Wiring Diagram".
1.CONNECTOR CHECK
Check the audio unit and speaker connectors for the following:
Is the inspection result normal? YES >> GO TO 2.
NO >> Repair the terminals or connectors.
2.CHECK REAR DOOR SPEAKER SIGNAL CIRCUIT CONTINUITY


Is the inspection result normal? YES >> GO TO 3.
NO >> Repair or replace harness or connectors.
3.CHECK REAR DOOR SPEAKER SIGNAL


Is the inspection result normal? YES >> Replace rear door speaker. Refer to AV-68, "Removal and Installation".
NO >> Replace audio unit. Refer to AV-64, "Removal and Installation".
REAR VIEW CAMERA IMAGE SIGNAL CIRCUIT
Diagnosis Procedure
Regarding Wiring Diagram information, refer to AV-27, "Wiring Diagram".
1.CHECK REVERSE INPUT SIGNAL

Is inspection result normal? YES >> GO TO 2.
NO >> Repair or replace harness or connectors.
2.CHECK CAMERA POWER SUPPLY CIRCUIT CONTINUITY


Is inspection result normal? YES >> GO TO 3.
NO >> Repair or replace harness or connectors.
3.CHECK CAMERA POWER SUPPLY VOLTAGE

Is inspection result normal? YES >> GO TO 4.
NO >> Replace audio unit. Refer to AV-64, "Removal and Installation".
4.CHECK CAMERA IMAGE SIGNAL CIRCUIT CONTINUITY


Is inspection result normal? YES >> GO TO 5.
NO >> Repair or replace harness or connectors.
5.CHECK CAMERA GROUND CIRCUIT CONTINUITY
Check continuity between audio unit connector M87 and rear view camera connector D504.

Is inspection result normal? YES >> GO TO 6.
NO >> Repair or replace harness or connectors.
6.CHECK CAMERA IMAGE SIGNAL

Is inspection result normal? YES >> Replace audio unit. Refer to AV-64, "Removal and Installation".
NO >> Replace rear view camera. Refer to AV-71, "Removal and Installation".
MICROPHONE SIGNAL CIRCUIT
Diagnosis Procedure
Regarding Wiring Diagram information, refer to AV-27, "Wiring Diagram".
1.CHECK HARNESS BETWEEN AUDIO UNIT AND MICROPHONE


Is the inspection result normal? YES >> GO TO 2.
NO >> Repair harness or connectors.
2.CHECK MICROPHONE POWER SUPPLY

Is the inspection result normal? YES >> GO TO 3.
NO >> Replace audio unit. Refer to AV-64, "Removal and Installation".
3.CHECK MICROPHONE SIGNAL
Check signal between terminals of audio unit connector M87.

Is the inspection result normal? YES >> Replace audio unit. Refer to AV-64, "Removal and Installation".
NO >> Replace microphone. Refer to AV-70, "Removal and Installation".
STEERING SWITCH
Diagnosis Procedure
Regarding Wiring Diagram information, refer to AV-27, "Wiring Diagram".
1.CHECK STEERING WHEEL AUDIO CONTROL SWITCH RESISTANCE

Is the inspection result normal? YES >> GO TO 2.
NO >> Replace steering switches. Refer to AV-65, "Removal and Installation".
2.CHECK HARNESS BETWEEN COMBINATION METER AND COMBINATION SWITCH


Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness or connectors.
3.CHECK COMBINATION SWITCH
Check continuity between combination switch connectors M90 and M30.

Is the inspection result normal? YES >> GO TO 4.
NO >> Replace spiral cable. Refer to SR-15, "Removal and Installation".
4.CHECK HARNESS BETWEEN COMBINATION METER AND AUDIO UNIT


Is the inspection result normal? YES >> Replace audio unit. Refer to AV-64, "Removal and Installation".
NO >> Repair or replace harness or connectors.
USB CONNECTOR
Diagnosis Procedure
Regarding Wiring Diagram information, refer to AV-27, "Wiring Diagram".
1.CHECK USB INTERFACE HARNESS CONTINUITY


Is the inspection result normal? YES >> Replace the USB interface. Refer to AV-69, "Removal and Installation".
NO >> Repair or replace harness or connectors.
AUXILIARY INPUT JACK
Diagnosis Procedure
Regarding Wiring Diagram information, refer to AV-27, "Wiring Diagram".
1.CHECK AUX JACK HARNESS CONTINUITY


Is the inspection result normal? YES >> Replace the AUX in jack. Refer to AV-69, "Removal and Installation".
NO >> Repair or replace harness or connectors.
Basic inspection
Symptom diagnosisECU diagnosis information
A/C AUTO AMP.
Reference Value
VALUES ON THE DIAGNOSIS TOOL
TERMINAL LAYOUT
PHYSICAL VALUES
DTC Inspection Priority Chart
If some DTCs are displayed at the same time, perform inspections one by one
based on the following priority
chart.
Priority
Det ...
Engine compartment
CAUTIONNever use a fuse of a higher or lower
amperage rating than specified on the
fuse box cover. This could damage the
electrical system or cause a fire.
Two types of fuses are used. Type A is used in
the fuse boxes in the engine compartment. Type
B is used in the passe ...
U1000 CAN COMM circuit
Description
CAN (Controller Area Network) is a serial communication line for real-time
application. It is an on-vehicle multiplex
communication line with high data communication speed and excellent malfunction
detection ability.
Many electronic control units are equipped onto a vehicle, and ...