Audio System: Troubleshooting

NOTE: When replacing the internal mechanism (computer part) of the audio system, be careful that no part of your body or clothing comes in contact with the terminals of the leads from the IC, etc. of the replacement part (spare part).

NOTE: This inspection procedure is a simple troubleshooting which should be carried out on the vehicle during system operation and was prepared on the assumption of system component troubles (except for the wires and connectors, etc.).

Always inspect the part with trouble taking the following items into consideration.

Open or short circuit of the wire harness
Connector or terminal connection fault

RADIO PROBLEM AND NO.

Component	Problem	No.
Radio	Radio Not Operating When Power Switch Turned To "ON".	1
	Display Indicates When Power Switch Turned To "ON", But No Sound (Including "Noise") Is Produced.	2
	Noise Present, But AM - FM Not Operating.	3
	Any Speaker Does Not Work.	4
	Any AM Or FM Does Not Work.	5
	Few Preset Turning Bands.	5
	Reception Poor.	6
	Sound Quality Poor.	7
	Preset Memory Erased.	8
Tape Player	Cassette Tape Cannot Be Inserted.	9
	Cassette Tape Inserted, But No Power.	10
	Power Coming In, But Tape Player Not Operating.	11
	Any Speaker Does Not Work.	12
	Sound Quality Poor.	13
	Tape Jammed, Malfunction With Tape Speed Or Auto-Reverse.	14
	Cassette Tape Will Not Eject.	15
CD Player	CD Cannot Be Inserted.	16
	CD Inserted, But No Power.	17
	Power Coming In, But CD Player Not Operating.	18
	Sound Jumps.	19
	Sound Quality Poor (Volume Faint).	20
	Any Speaker Does Not Work.	21
	CD Will Not Be Ejected.	22
Power Amplifier	No Power Coming In.	23
	Power Coming In, But Power Amplifier Not Operating.	24
	Any Speaker Does Not Work.	25
Noise	Noise Occurs	26
	Noise Produced By Vibration Or Shock While Driving.	27
	Noise Produced When Engine Starts.	28

The term "AM" includes LW, MW and SW, and the term "FM" includes UKW.

Radio : RADIO NOT OPERATING WHEN POWER SWITCH TURNED TO "ON"

Fig 1: Radio Not Operating When Power Switch Turned To "ON" Diagnosis Flow Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Radio : DISPLAY INDICATES WHEN POWER SWITCH TURNED TO "ON", BUT NO SOUND (INCLUDING "NOISE") IS PRODUCED

Fig 2: Power Switch Turn To "ON" But No Sound Diagnosis Flow Chart
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Radio : NOISE PRESENT, BUT AM-FM NOT OPERATING

Fig 3: Noise Present, But Am-FM Not Operating Diagnosis Flow Chart
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Radio : ANY SPEAKER DOES NOT WORK

Fig 4: Any Speaker Does Not Work Diagnosis Flow Chart
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Radio : ANY AM OR FM DOES NOR WORK FEW PRESET TUNING BANDS

Fig 5: Any Am Or FM Does Nor Work Few Preset Tuning Bands Diagnosis Flow Chart
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Radio : SOUND QUALITY POOR

Fig 7: Sound Quality Poor Diagnosis Flow Chart
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Radio : PRESET MEMORY DISAPPEARS

Fig 8: Preset Memory Disappears Diagnosis Flow Chart
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Tape Player : CASSETTE TAPE CANNOT BE INSERTED

Fig 9: Cassette Tape Cannot Be Inserted Diagnosis Flow Chart
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Tape Player : CASSETTE TAPE INSERTED, BUT NO POWER

Fig 10: Cassette Tape Inserted, But No Power Diagnosis Flow Chart
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Tape Player : POWER COMING IN, BUT TAPE PLAYER NOT OPERATING

Fig 11: Power Coming In, But Tape Player Not Operating Diagnosis Flow Chart
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Tape Player : ANY SPEAKER DOES NOT WORK

Fig 12: Any Speaker Does Not Work Diagnosis Flow Chart
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Tape Player : SOUND QUALITY POOR (VOLUME FAINT)

Fig 13: Sound Quality Poor (Volume Faint) Diagnosis Flow Chart
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Tape Player : TAPE JAMMED, MALFUNCTION WITH TAPE SPEED OR AUTO-REVERSE

Fig 14: Tape Jammed, Malfunction With Tape Speed Or Auto-Reverse Diagnosis Flow Chart
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Tape Player : CASSETTE TAPE WILL NOT BE EJECTED

Fig 15: Cassette Tape Will Not Be Ejected Diagnosis Flow Chart
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CD Player : CD CANNOT BE INSERTED

Fig 16: CD Cannot Be Inserted Diagnosis Flow Chart
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CD Player : CD INSERTED, BUT NO POWER

Fig 17: CD Inserted, But No Power Diagnosis Flow Chart
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CD Player : POWER COMING IN, BUT CD PLAYER NOT OPERATING

Fig 18: Power Coming In, But CD Player Not Operating Diagnosis Flow Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CD Player : SOUND QUALITY POOR (VOLUME FAINT)

Fig 20: Sound Quality Poor (Volume Faint) Diagnosis Flow Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CD Player : ANY SPEAKER DOES NOT WORK

Fig 21: Any Speaker Does Not Work Diagnosis Flow Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CD Player : CD WILL NOT BE EJECTED

Fig 22: CD Will Not Be Ejected Diagnosis Flow Chart
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Power Amplifier : NO POWER COMING IN

Fig 23: No Power Coming In Diagnosis Flow Chart
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Power Amplifier : POWER COMING IN, BUT WOOFER (POWER) AMPLIFIER NOT OPERATING

Fig 24: Power Coming In, But Woofer (Power) Amplifier Not Operating Diagnosis Flow Chart
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Power Amplifier : ANY SPEAKER DOES NOT WORK

Fig 25: Any Speaker Does Not Work Diagnosis Flow Chart
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Noise : NOISE PRODUCED BY VIBRATION OR SHOCK WHILE DRIVING

Fig 27: Noise Produced By Vibration Or Shock While Driving Diagnosis Flow Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Noise : NOISE PRODUCED WHEN ENGINE STARTS

Fig 28: Noise Produced When Engine Starts Diagnosis Flow Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002