Audio System: Troubleshooting

DIAGNOSIS FUNCTION
1. Diagnosis start-up
  1. Turn the ignition switch to ACC or ON.
  2. Holding both the 1 and 6 buttons depressed, push the DISC button 3 times.
  HINT:
  
  By pressing the DISC button for 2 seconds or turning the ignition switch to OFF, diagnosis mode is released.
  
  Fig 1: Identifying DISC Button
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Service check mode
  1. After the diagnosis start-up, the system enters service check mode when "TUNE UP" switch is pressed.
  2. Error codes over tuner and connected equipment are displayed on the screen of tuner. Results for each check are displayed as follows:
    - good:
      No DTC is detected for both "System Check Confirmation" and "Diagnosis Memory Response".
    - nCon:
      The Component does not respond to the "Diagnosis On Instruction" command. Applicable to only the system where connected components are limited to be used.
    - ECHn:
      Application of new version has been confirmed by the "Diagnosis On Check", and there is one or more DTC which indicates "Replacement" in the "System Check Result Response" or "Diagnosis Memory Response".
    - CHEC:
      Application of new version has been confirmed by the "Diagnosis On Check", and there is no DTC which indicates "Replacement" in the "System Check Result Response" or "Diagnosis Memory Response", but one or more DTC which indicates "Check" is identified.
    - Old:
      Application of old version is confirmed by the "Diagnosis On Check", and DTC is identified in the "System Check Result Response" or "Diagnosis Memory Response".
    - nrES:
      No response is identified to the "System Check Start Instruction" and "Request for System Check Result" commands.
    HINT:
  3. Check the present and past conditions of components by performing the System Check and collecting stored DTC memories.
  4. Check results are displayed as one of the six following indications: "good", "ECHn", "CHECc" "nCon", "Old" or "nrES".
3. Display Screen for Service Check.
  Example:
  
  Connection parts ( physical address): Radio receiver (P190)
  
  Fig 2: Service Check Flow Chart - Connection Parts (Physical Address) Radio Receiver (P190)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. "ECHN" Detail Display Mode Screen
  
  Fig 3: Service Check Flow Chart - ECHN Detail Display Mode Screen
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. "CHEC" Detail Display Mode Screen
  
  Fig 4: Service Check Flow Chart - CHEC Detail Display Mode Screen
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. "OLD" Detail Display Mode Screen
  
  Fig 5: Service Check Flow Chart - OLD Detail Display Mode Screen
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Recheck
  1. Pressing the [ch1] key in service Check Mode executes recheck.
  2. To display the recheck process, follow the sequence indicated as Display Screen for Service Check.

DIAGNOSIS CODE LIST

Terms	Meaning
Physical address	Three-digit code (shown in hexadecimal) which is given to each component comprising the AVC-LAN. Corresponding to the function, individual symbols are specified.
Logical address	Two-digit code (shown in hexadecimal) which is given to each function comprising the inner system of the AVC-LAN.

Physical address: 190 Radio receiver assembly
HINT:
- ^* 1: Even if no failure is detected, it may be stored depending on the battery condition or voltage for starting an engine.
- ^* 2: It is stored when 180 sec. has passed after the power supply connector is pulled out after engine start.
- ^* 3: It may be stored when the engine key is turned 1 min. again after engine start.
- ^* 4: It may be stored when the engine key is turned again after engine start.
- ^* 5: When 210 sec. has passed after pulling out the power supply connector of the master component with the ignition switch in ACC or ON, this code is stored.
1. Logical address: 01 (Communication control)
  
  Fig 6: DTC - Logical Address 01 (Communication Control) (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 7: DTC - Logical Address 01 (Communication Control) (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Logical address: 63 (In-dash CD player)

DTC - LOGICAL ADDRESS 63 (IN-DASH CD PLAYER)

DTC	Diagnosis item	Diagnosis content	Countermeasure and inspected parts
42	No Disc Readout	Disc cannot be read.	Inspect CD.
44	CD Error	Error is detected in cd player.	Replace radio receiver assembly.
45	Eject Error	CD cannot be ejected.	Replace radio receiver assembly.
46	Scratched/Reversed Disc	Scratches or dirt is found on CD surface or CD is set upside down.	Inspect CD.
51	CD changer elevator Error	Mechanical error occurred during elevator operation	Replace radio receiver assembly.
52	CD changer clump Error	Failure in disc clamping or clamp error	Replace radio receiver assembly.

PROBLEM SYMPTOMS TABLE

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).

HINT:

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

PROBLEM SYMPTOMS

Components	Problem	No.
Radio	Radio not operating when power switch turned to "ON".	1
Radio	Display indicates when power switch turned to "ON", but no sound (including "noise") is produced.	2
Radio	Noise present, but AM - FM not operating.	3
Radio	Any speaker does not work.	4
Radio	Any AM or FM does not work.	5
Radio	Few preset turning bands.	5
Radio	Reception poor.	6
Radio	Sound quality poor.	7
Radio	Preset memory erased.	8
CD player	CD cannot be inserted.	9
CD player	CD inserted, but no power.	10
CD player	Power coming in, but CD player not operating.	11
CD player	Sound jumps.	12
CD player	Sound quality poor (Volumefaint).	13
CD player	Any speaker does not work.	14
CD player	CD will not be ejected.	15
Poweramplifier	No power coming in.	16
Poweramplifier	Power coming in, but power amplifier not operating.	17
Poweramplifier	Any speaker does not work.	18
Noise	Noise occurs	19
Noise	Noise produced by vibration or shock while driving.	20
Noise	Noise produced when engine starts.	21

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

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

Fig 8: Problem Symptoms - Radio Not Operating When Power Switch Turned To ON
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Radio DISPLAY INDICATES WHEN POWER SWITCH TURNED TO "ON", BUT NO SOUND (INCLUDING "NOISE") IS PRODUCED

Fig 9: Problem Symptoms - Radio Display Indicates When Power Switch Turned To ON But No Sound Is Produced
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Radio NOISE PRESENT, BUT AM-FM NOT OPERATING

Fig 10: Problem Symptoms - Radio Noise Present, But AM-FM Not Operating
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Radio ANY SPEAKER DOSE NOT WORK

Fig 11: Problem Symptoms - Radio Any Speaker Dose Not Work
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Radio ANY AM OR FM DOES NOR WORK FEW PRESET TUNING BANDS

Fig 12: Problem Symptoms - Radio Any AM Or FM Does Nor Work FEW Preset Tuning Bands
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Radio SOUND QUALITY POOR

Fig 14: Problem Symptoms - Radio Sound Quality Poor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CD Player CD CANNOT BE INSERTED

Fig 15: Problem Symptoms - CD Player CD Cannot Be Inserted
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CD Player CD INSERTED, BUT NO POWER

Fig 16: Problem Symptoms - CD Player CD Inserted, But No Power
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CD Player POWER COMING IN, BUT CD PLAYER NOT OPERATING

Fig 17: Problem Symptoms - CD Player Power Coming In, But CD Player Not Operating
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CD Player SOUND QUALITY POOR (VOLUME FAINT)

Fig 19: Problem Symptoms - CD Player Sound Quality Poor (Volume Faint)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CD Player ANY SPEAKER DOES NOT WORK

Fig 20: Problem Symptoms - CD Player Any Speaker Does Not Work
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CD Player CD WILL NOT BE EJECTED

Fig 21: Problem Symptoms - CD Player CD Will Not Be Ejected
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Power Amplifier NO POWER COMING IN

Fig 22: Problem Symptoms - Power Amplifier NO Power Coming In
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Power Amplifier POWER COMING IN, BUT WOOFER (POWER) AMPLIFIER NOT OPERATING

Fig 23: Problem Symptoms - Power Amplifier Power Coming In, But Woofer (Power) Amplifier Not Operating
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Power Amplifier ANY SPEAKER DOES NOT WORK

Fig 24: Problem Symptoms - Power Amplifier Any Speaker Does Not Work
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Noise NOISE PRODUCED BY VIBRATION OR SHOCK WHILE DRIVING

Fig 26: Problem Symptoms - Noise Produced By Vibration Or Shock While Driving
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Noise NOISE PRODUCED WHEN ENGINE STARTS

Fig 27: Problem Symptoms - Noise Produced When Engine Starts
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002