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Fig. 30: DTC Detecting Condition Chart (Audio And Rear A/C Control SW)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
*1: Even if no failure is detected, a trouble code may be recorded depending on the battery
condition or engine start voltage.
*2: If the power connector is disconnected after the engine starts, this code is recorded after
180 seconds.
*3: This code may be stored if the ignition key is turned again after the engine starts.
*4: This code may be stored if the ignition key is held in the START position for one minute
or more before returning to the ON position.
*5: If the device is reported as not existing during verification, check the power source circuit
and AVC-LAN circuit for the device.
4.GATEWAY ECU (Physical address: 1C6) [G/W]
a. Logical address: 01 (Communication control)
HINT:
Methods used to verify the cause of the problem are listed in order of probability in the verification
column.
Fig. 31: DTC Detecting Condition Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
This code is stored 210 seconds after the power supply connector of the master component is
disconnected with the ignition switch in the ACC or ON position.
5.STEREO COMPONENT TUNER (Physical address: 1FO) [RADIO TUNER]
a. Logical address: 01 (Communication control)
HINT:
Page 738 of 4500
Methods used to verify the cause of the problem are listed in order of probability in the verification
column.
Fig. 32: DTC Detecting Condition Chart [RADIO Tuner]
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Page 739 of 4500
HINT:
*1: Even if no failure is detected, a trouble code may be recorded depending on the battery
condition or engine start voltage.
*2: If the power connector is disconnected after the engine starts, this code is recorded after
180 seconds.
*3: This code may be stored if the ignition key is turned again after the engine starts.
*4: This code may be stored if the ignition key is held in the START position for one minute
or more before returning to the ON position.
*5: If the device is reported as not existing during verification, check the power source circuit
and AVC-LAN circuit for the device.
b. Logical address: 60 (Radio)
HINT:
Methods used to verify the cause of the problem are listed in order of probability in the verification
column.
Fig. 33: DTC Detecting Condition Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Page 740 of 4500
6.STEREO COMPONENT AMPLIFIER ASSY (Physical address: 440) [DSP AMP]
a. Logical address: 01 (Communication control)
HINT:
Methods used to verify the cause of the problem are listed in order of probability in the verification
column.
Page 741 of 4500
Page 742 of 4500

Fig. 34: DTC Detecting Condition Chart Physical (Address: 440)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
*1: Even if no failure is detected, a trouble code may be recorded depending on the battery
condition or engine start voltage.
*2: If the power connector is disconnected after the engine starts, this code is recorded after
180 seconds.
*3: This code may be stored if the ignition key is turned again after the engine starts.
*4: This code may be stored if the ignition key is held in the START position for one minute
or more before returning to the ON position.
*5: If the device is reported as not existing during verification, check the power source circuit
and AVC-LAN circuit for the device.
7.THE INSPECTION LIST FOR THE DEVICE INDICATED BY THE SUB CODE
HINT:
Methods used to verify the cause of the problem are listed in order of probability in the verification
column.
Fig. 35: Inspecting List For Device Indicated By Sub Code
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Page 743 of 4500

INSPECTION PROCEDURE
1.CHECK CABIN
a. Check that conditions in the cabin are likely to cause condensation.
HINT:
This problem occurs when the cabin is humid and the temperature changes rapidly. This may produce
condensation, resulting in a short circuit.
OK: Condensation is not likely.
NG: DRY CABIN AND RECHECK CONDITIONS
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
2 CHECK AUDIO SETTINGS
OK: END
NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
INSPECTION PROCEDURE
1.CHECK RADIO RECEIVER ASSY
a. Check the radio's automatic search function.
1. Check the radio's automatic station search function by activating it.
OK: The radio's automatic station search function works properly.
OK: REPLACE RADIO RECEIVER ASSY (SEE REPLACEMENT
)
NG: Go to next step
2.CHECK OPTIONAL COMPONENTS
a. Check the optional components (sun-shade film, telephone antenna, etc.)
1. Check if optional components, such as sun-shade film or telephone antenna that ma
y
Page 744 of 4500
decrease reception capacity, are installed.
OK: Optional components are installed.
OK: REMOVE OPTIONAL COMPONENTS AND CHECK AGAIN
NG: Go to next step
3.CHECK THE ANTENNA
a. Check the antenna for noise.
1. Turn the ignition switch to the ACC position, turn the radio on, and put the radio into AM
mode.
Contact the tip of a screwdriver on the antenna assy and check that noise can be heard from the speaker.
OK: Noise is heard from the speaker.
OK: REPAIR ANTENNA ASSY (SEE REPLACEMENT
)
NG: Go to next step
4.CHECK RADIO RECEIVER ASSY
a. Preparation for check
1. Remove the antenna plug from the radio receiver assy.
b. Check for noise