Audio System - Diagnostics: Diagnosis Toyota Corolla IX рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING

1. VEHICLE BROUGHT TO WORKSHOP NEXT: GO TO NEXT STEP
2. CUSTOMER PROBLEM ANALYSIS (SEE «CUSTOMER PROBLEM ANALYSIS CHECK»(ref-225482-S10093656742006031900000) ) Interview and confirm the trouble. Confirm the condition of the trouble. NEXT: GO TO NEXT STEP
3. BASIC INSPECTION Basic inspection. Check the battery voltage. Standard: 11 to 14 V Check the power supply to the radio receiver assy. Turn the ignition switch to the ACC position. Check whether or not the display appears on the radio receiver assy. DISPLAY DOES NOT APPEAR (PROCEED TO PROBLEM SYMPTOMS TABLE) (SEE «PROBLEM SYMPTOMS TABLE»(ref-225482-S10290537242006031900000) ) DISPLAY APPEARS (GO TO STEP 4)
4. DTC CHECK (SEE «DTC CHECK/CLEAR»(ref-225482-S08574946912006031900000) ) DTC IS OUTPUT (GO TO STEP 5) DTC IS NOT OUTPUT (GO TO STEP 6 )
5. DTC CHART (SEE «DIAGNOSTIC TROUBLE CODE CHART»(ref-225482-S15930087872006031900000) ) NEXT: GO TO STEP 7
6. PROBLEM SYMPTOMS TABLE (SEE «PROBLEM SYMPTOMS TABLE»(ref-225482-S10290537242006031900000) ) NEXT: GO TO NEXT STEP
7. CIRCUIT INSPECTION AND PART INSPECTION (SEE «POWER SOURCE CIRCUIT (RADIO RECEIVER ASSY)»(ref-225482-S32372121702006031900000) - «CD SOUND SKIPS»(ref-225482-S20391253322006031900000) ) NEXT: GO TO NEXT STEP
8. IDENTIFICATION OF PROBLEM NEXT: GO TO NEXT STEP
9. CONFIRMATION TEST NEXT: GO TO NEXT STEP END

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

1. RADIO WAVE BAND The radio wave bands used in radio broadcasting are as follows
2. SERVICE AREA There is a great difference in the size of the service areas for AM and FM broadcasting. Sometimes an FM stereo broadcast cannot be received even though AM can be received very clearly. FM stereo has the smaller service area, and it also picks up static and other types of interference ("noise") easily.
3. RECEPTION PROBLEMS HINT: Besides the problem of static, there are other problems, such as "phasing", "multipath" and "fade out". These problems are caused not by electrical noise but by the nature of the radio waves themselves. Phasing Besides electrical interference, AM broadcasts are also susceptible to other types of interference, especially at night. This is because AM radio waves bounce off the ionosphere at night. These radio waves then interfere with the signals that reach the vehicle's antenna directly from the same transmitter. This type of interference is called "phasing". Multipath Interference caused by reflection of radio waves against obstructions is called "Multipath". Multipath occurs when radio signals emitted from the broadcast transmitter antenna are reflected against tall buildings or mountains and interfere with other signals which are to be received directly. Fade Out FM radio wave tends to be reflected against obstructions such as tall buildings or mountains because FM frequency is higher than AM. For this reason, FM signals often seem to gradually disappear or fade away as the vehicle goes behind those obstructions. This phenomenon is called "fade out".
4. NOISE PROBLEMS It is very important for technicians to clearly understand a customer's claim about noise. Use the following table to diagnose the phenomena. PROBLEM SYMPTOMS Radio wave Condition in which noise occurs Probable cause AM Noise occurs at a specific place. Strong possibility of foreign noise. AM Noise occurs when listening to faint broadcasting. The same program may be broadcasted from some local stations. If the program is the same, one of those may be tuned in. FM Noise occurs only at night. Strong possibility of an interfering beat from a distant broadcast. FM Noise occurs at a specific place during driving. Strong possibility of multipath noise and phasing noise caused by changes of FM frequency. HINT: If the condition when the noise occurs does not meet any of the above, find out the cause based on "Reception Problems". Refer to the description about multipath and phasing mentioned previously.
5. Identify the conditions under which the noise occurs, and check the noise filter on the relevant part. NOISE CONDITION CHART Conditions under which noise occurs Noise type Noise increases when the accelerator pedal is depressed, but stops when the engine is stopped. Generator noise Noise occurs during A/C or heater operation. Blower motor noise Noise occurs when the vehicle accelerates rapidly on an unpaved road or after the ignition switch is turned on. Fuel pump noise Noise occurs when the horn switch is pressed and released or when pressed and held. Horn noise Quiet noise occurs while the engine is running, but stops when the engine is stopped. Ignition noise Noise occurs synchronously with the blink of the turn signal. Flasher noise Noise occurs during window washer operation. Washer noise Noise occurs while the engine is running, and continues even after the engine is stopped. Water temperature sensor noise Noise occurs during wiper operation. Wiper noise Noise occurs when the brake pedal is depressed. Stop light switch noise Others Static electricity stored on the vehicle Reference

1. First ensure that the noise is not coming from the outside. Failure to do so makes noise source detection difficult and may lead to a misdiagnosis.
2. Noise should be removed in descending order of loudness.
3. Tuning the radio so that no station is received makes the noise more noticeable, making the recognition of the phenomenon easier.

DIAGNOSTIC TROUBLE CODE CHART

DIAGNOSTIC TROUBLE CODE CHART

HINT: Titles for each unit are stated in the following order: physical address (part name).

Scheme 13

Scheme 14

Scheme 15

1. 190 (RADIO RECEIVER ASSY) Logical address: 01 (Communication control) HINT: *1: This code may be recorded depending on the battery condition or engine start voltage even if no failure is detected. *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 to the START position again with the engine running. *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. Logical address: 62 (CD player)

Scheme 16

Scheme 17

Scheme 18

1. Logical address: 63 (In-dash CD changer)
2. 440 (STEREO COMPONENT AMPLIFIER ASSY) Logical address: 01 (Communication control)

HINT

1. *1: This code may be recorded depending on the battery condition or engine start voltage even if no failure is detected.
2. *2: This code may be stored if the ignition key is turned to the START position again with the engine running.
3. *3: 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.
4. *4: If the device is reported as not existing during verification, check the power source circuit and AVC-LAN circuit for the device.

CIRCUIT DESCRIPTION

This circuit provides power to the radio receiver assy.

Scheme 19

Scheme 20

1. INSPECT RADIO RECEIVER ASSY Disconnect the radio receiver assy R3 or R19 connector. Measure the resistance according to the values in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Condition Specified Condition GND (R19-20) - Body ground (1) Always Below 1 ohm GND (R3-7) - Body ground (2) Always Below 1 ohm (1) Separate Type Amplifier (2) Built-in Type Amplifier Measure the voltage according to the values in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Condition Specified Condition +B (R19-1) - GND (R19-20) (1) Always 10 to 14 V +B (R3-4) - GND (R3-7) (2) Always 10 to 14 V ACC (R19-11) - GND (R19-20) (1) Ignition SW ACC 10 to 14 V ACC (R3-3) - GND (R3-7) (2) Ignition SW ACC 10 to 14 V (1) Separate Type Amplifier (2) Built-in Type Amplifier NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (RADIO RECEIVER ASSY - BATTERY OR BODY GROUND) OK: TROUBLESHOOTING FLOW
2. TROUBLESHOOTING FLOW Continue troubleshooting according to the table below. TROUBLESHOOTING FLOW When troubleshooting according to the DIAGNOSTIC TROUBLE CODE CHART A When troubleshooting according to the PROBLEM SYMPTOMS TABLE B B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE «PROBLEM SYMPTOMS TABLE»(ref-225482-S10290537242006031900000) ) A: GO TO NEXT STEP
3. CHECK DIAGNOSTIC TROUBLE CODE CHART Check the diagnostic trouble code chart. DIAGNOSTIC TROUBLE CODE CHART All possible countermeasures have been taken A Possible countermeasures still exist B B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN DIAGNOSTIC TROUBLE CODE CHART (SEE «DIAGNOSTIC TROUBLE CODE CHART»(ref-225482-S15930087872006031900000) ) A: GO TO NEXT STEP
4. REPLACE STEREO COMPONENT AMPLIFIER ASSY (SEE «STEREO COMPONENT AMPLIFIER ASSY»(ref-225516-S01529924412006031900000) ) Replace the stereo component amplifier assy and check if it operates normally. OK: The audio system operates normally. OK: NORMAL OPERATION NG: GO TO NEXT STEP REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) )

This circuit provides power to the stereo component amplifier assy.

Scheme 21

Scheme 22

1. INSPECT STEREO COMPONENT AMPLIFIER ASSY Disconnect the stereo component amplifier assy S15 and S16 connectors. Measure the resistance according to the values in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Condition Specified Condition GND2 (S15-16) - Body ground Always Below 1 ohm GND (S15-15) - Body ground Always Below 1 ohm Measure the voltage according to the values in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Condition Specified Condition B+ (S15-1) - GND (S15-15) Always 10 to 14 V B2+ (S15-10) - GND (S15-15) Always 10 to 14 V ACC (S16-12) - GND (S15-15) Ignition SW ACC 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STEREO COMPONENT AMPLIFIER ASSY - BATTERY OR BODY GROUND) OK: GO TO NEXT STEP
2. TROUBLESHOOTING FLOW Continue troubleshooting according to the table below. TROUBLESHOOTING FLOW When troubleshooting according to the DIAGNOSTIC TROUBLE CODE CHART A When troubleshooting according to the PROBLEM SYMPTOMS TABLE B B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE «PROBLEM SYMPTOMS TABLE»(ref-225482-S10290537242006031900000) ) A: GO TO NEXT STEP
3. CHECK DIAGNOSTIC TROUBLE CODE CHART Check the diagnostic trouble code chart. DIAGNOSTIC TROUBLE CODE CHART All possible countermeasures have been taken A Possible countermeasures still exist B B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN DIAGNOSTIC TROUBLE CODE CHART (SEE «DIAGNOSTIC TROUBLE CODE CHART»(ref-225482-S15930087872006031900000) ) A: GO TO NEXT STEP
4. REPLACE STEREO COMPONENT AMPLIFIER ASSY (SEE «STEREO COMPONENT AMPLIFIER ASSY»(ref-225516-S01529924412006031900000) ) Replace the stereo component amplifier assy and check if it operates normally. OK: The audio system operates normally. OK: NORMAL OPERATION NG: GO TO NEXT STEP REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) )

Power is supplied to the radio receiver panel illumination when the light control switch is in the TAIL or HEAD position.

The intensity of the radio receiver panel illumination can be adjusted by the light control rheostat.

Scheme 23

Scheme 24

Scheme 25

1. CHECK SYSTEM Turn the light control switch to the TAIL or HEAD position. Check if other displays or indicators such as the A/C switch indicator come on. OK: Other displays or indicators come on. NG: GO TO LIGHTING SYSTEM (SEE «PROBLEM SYMPTOMS TABLE»(ref-225514-S09541240422006031900000) ) OK: GO TO NEXT STEP
2. CHECK RADIO RECEIVER ASSY Disconnect the radio receiver assy R3 or R19 connector. Measure the voltage according to the values in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Condition Specified Condition ILL+ (R19-2) - Body ground (1) Light control switch TAIL 10 to 14 V ILL+ (R3-10) - Body ground (2) Light control switch TAIL 10 to 14 V (1) Separate Type Amplifier (2) Built-in Type Amplifier NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (RADIO RECEIVER ASSY - RH R/B (USA) OR COMBINATION SW (CANADA)) OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSY - LIGHT CONTROL RHEOSTAT) Disconnect the radio receiver assy R4 or R19 connector and light control rheostat R7 connector. Measure the resistance according to the values in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Specified Condition ILL- (R19-12) - LAMP (R7-1) (1) Below 1 ohm ILL- (R19-12) - Body ground (1) 10 kohm or higher ILL- (R4-5) - LAMP (R7-1) (2) Below 1 ohm ILL- (R4-5) - Body ground (2) 10 kohm or higher (1) Separate Type Amplifier (2) Built-in Type Amplifier NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE «PROBLEM SYMPTOMS TABLE»(ref-225482-S10290537242006031900000) )

This circuit sends a signal to the stereo component amplifier to mute the noise. Because of that, the noise produced by changing the sound source ceases.

If there is an open in the circuit, noise can be heard from the speaker when changing the sound source. If there is a short in the circuit, even though the stereo component amplifier assy is normal, no sound or only extremely small sound can be produced.

Scheme 26

Scheme 27

Scheme 28

Scheme 29

1. INSPECT STEREO COMPONENT AMPLIFIER ASSY Measure the voltage according to the value in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Condition Specification MUTE (S16-1) - Body ground Turn ignition switch to ACC, Audio system is playing --> Changing Above 3.5 V --> Below 1 V NG: Go to step 2 OK: GO TO NEXT STEP PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE «PROBLEM SYMPTOMS TABLE»(ref-225482-S10290537242006031900000) )
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSY - STEREO COMPONENT AMPLIFIER ASSY) Disconnect the radio receiver assy R19 connector and stereo component amplifier assy S16 connector. Measure the resistance according to the values in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Condition Specified Condition MUTE (R19-7) - MUTE (S16-1) Always Below 1 ohm MUTE (R19-7) - Body ground Always 10 kohm or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
3. INSPECT RADIO RECEIVER ASSY Reconnect the stereo component amplifier assy connector. Measure the voltage according to the value in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Condition Specification MUTE (R19-7) - Body ground Turn ignition switch to ACC Above 3.5 V NG: REPLACE STEREO COMPONENT AMPLIFIER ASSY (SEE «STEREO COMPONENT AMPLIFIER ASSY»(ref-225516-S01529924412006031900000) ) OK: GO TO NEXT STEP REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) )

The sound signal that has been amplified by the stereo component amplifier or radio receiver assy (built-in amp) is sent to the speakers from the stereo component amplifier assy or radio receiver assy through this circuit.

If there is a short in this circuit, the stereo component amplifier assy detects it and stops output to the speakers.

Thus sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assy or speakers.

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

1. CHECK HARNESS AND CONNECTOR Disconnect the connectors shown in the illustration on the left from the stereo component amplifier assy or the radio receiver assy and speakers. Measure the resistance between each speaker and the stereo component amplifier assy or the radio receiver assy to check for an open circuit in the wire harness. Standard: Below 1 ohm Measure the resistance between each speaker and body ground to check for a short circuit in the wire harness. Standard: 10 kohm or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
2. INSPECT FRONT NO.1 SPEAKER ASSY Resistance check. Measure the resistance between the terminals of the speaker. Standard: Separate Type Amplifier: 2.3 to 2.9 ohm Built-in Type Amplifier: 3.4 to 4.6 ohm NG: REPLACE FRONT NO.1 SPEAKER ASSY (SEE «FRONT NO.1 SPEAKER ASSY»(ref-225516-S01403575992006031900000) ) OK: GO TO NEXT STEP
3. INSPECT FRONT NO.2 SPEAKER ASSY Check that malfunction disappears when another speaker in good condition is installed. OK: Malfunction disappears. HINT: Connect all the connectors to the speakers. When there is a possibility that either right or left front speaker is detective, inspect by interchanging the right one and the left one. NG: REPLACE FRONT NO.2 SPEAKER ASSY (SEE «FRONT NO.2 SPEAKER ASSY»(ref-225516-S19346209982006031900000) ) OK: GO TO NEXT STEP
4. INSPECT REAR SPEAKER ASSY Resistance check. Measure the resistance between the terminals of the speaker. Standard: Separate Type Amplifier: 1.75 to 2.75 ohm Built-in Type Amplifier: 5.1 to 6.9 ohm NG: REPLACE REAR SPEAKER ASSY (SEE «REAR SPEAKER ASSY»(ref-225516-S15086547862006031900000) ) OK: GO TO NEXT STEP PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE «PROBLEM SYMPTOMS TABLE»(ref-225482-S10290537242006031900000) )

The radio receiver assy sends a sound signal to the stereo component amplifier assy through this circuit.

The sound signal that has been sent is amplified by the stereo component amplifier assy, and then sent to the speakers.

If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assy or speakers.

Scheme 36

Scheme 37

1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSY - STEREO COMPONENT AMPLIFIER ASSY) Disconnect the radio receiver assy R19 connector and stereo component amplifier assy S16 connector. Measure the resistance according to the values in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Specified Condition L+ (S16-3) - L+ (R19-9) Below 1 ohm L- (S16-2) - L- (R19-19) Below 1 ohm R+ (S16-5) - R+ (R19-8) Below 1 ohm R- (S16-4) - R- (R19-18) Below 1 ohm L+ (S16-3) - Body ground 10 kohm or higher L- (S16-2) - Body ground 10 kohm or higher R+ (S16-5) - Body ground 10 kohm or higher R- (S16-4) - Body ground 10 kohm or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE «PROBLEM SYMPTOMS TABLE»(ref-225482-S10290537242006031900000) )

Each unit of the audio system connected to the AVC-LAN (communication bus) transfers the signal of each switch by communication.

When a +B short or GND short occurs in this AVC-LAN, the audio system will not function normally as communication is discontinued.

In this AVC-LAN, the radio receiver assy becomes the master of the communication, and the radio receiver assy has resistance necessary for transmitting the communication.

Scheme 38

Scheme 39

Scheme 40

1. INSPECT RADIO RECEIVER ASSY Disconnect the radio receiver assy connector R19. Measure the resistance according to the value (s) in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Condition Specified Condition TX+ - TX- Always 60 to 80 ohm NG: REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) ) OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSY - STEREO COMPONENT AMPLIFIER ASSY) Disconnect the radio receiver assy R19 connector and stereo component amplifier assy S16 connector. Measure the resistance according to the values in the table below. Standard: TESTER CONNECTION SPECIFIED CONDITION Tester connection Specified Condition TX+ (S16-20) - TX+ (R19-5) Below 1 ohm TX- (S16-19) - TX- (R19-15) Below 1 ohm TX+ (R19-5) - Body ground 10 kohm or higher TX- (R19-15) - Body ground 10 kohm or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
3. TROUBLESHOOTING FLOW Continue troubleshooting according to the table below. TROUBLESHOOTING FLOW When troubleshooting according to the DIAGNOSTIC TROUBLE CODE CHART A When troubleshooting according to the PROBLEM SYMPTOMS TABLE B B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE «PROBLEM SYMPTOMS TABLE»(ref-225482-S10290537242006031900000) ) A: GO TO NEXT STEP
4. CHECK DIAGNOSTIC TROUBLE CODE CHART Check the diagnostic trouble code chart. DIAGNOSTIC TROUBLE CODE CHART All possible countermeasures have been taken A Possible countermeasures still exist B B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN DIAGNOSTIC TROUBLE CODE CHART (SEE «DIAGNOSTIC TROUBLE CODE CHART»(ref-225482-S15930087872006031900000) ) A: GO TO NEXT STEP
5. REPLACE STEREO COMPONENT AMPLIFIER ASSY (SEE «STEREO COMPONENT AMPLIFIER ASSY»(ref-225516-S01529924412006031900000) ) Replace the stereo component amplifier assy and check if it operates normally. OK: The audio system operates normally. OK: NORMAL OPERATION NG: GO TO NEXT STEP REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) )

INSPECTION PROCEDURE

1. ADJUST SOUND QUALITY Adjust the sound quality. Operate the radio receiver assy to adjust the sound quality. OK: Malfunction disappears. OK: SYSTEM IS OK NG: GO TO NEXT STEP
2. REPLACE STEREO COMPONENT AMPLIFIER ASSY (SEE «STEREO COMPONENT AMPLIFIER ASSY»(ref-225516-S01529924412006031900000) ) Replace the stereo component amplifier assy and recheck. OK: Malfunction disappears. OK: SYSTEM IS OK NG: GO TO NEXT STEP REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) )

1. CHECK SPEAKER INSTALLATION Check the speaker installation condition. Check that each speaker is securely installed. OK: Malfunction disappears. HINT: The radio is equipped with a noise prevention system that blocks excessively loud noise. If such noise occurs, check that all wiring is proper and that the antenna installation part ground and noise-prevention equipment are installed. NOISE CONDITION CHART Conditions under which noise occurs Noise type Noise increases when the accelerator pedal is depressed, but stops when the engine is stopped. Generator noise Noise occurs during A/C or heater operation. Blower motor noise Noise occurs when the vehicle accelerates rapidly on an unpaved road or after the ignition switch is turned on. Fuel pump noise Noise occurs when the horn switch is pressed and released or when pressed and held. Horn noise Quiet noise occurs while the engine is running, but stops when the engine is stopped. Ignition noise Noise occurs synchronously with the blink of the turn signal. Flasher noise Noise occurs during window washer operation. Washer noise Noise occurs while the engine is running, and continues even after the engine is stopped. Water temperature sensor noise Noise occurs during wiper operation. Wiper noise Noise occurs when the brake pedal is depressed. Stop light switch noise Others Static electricity stored on the vehicle HINT: Identify the conditions under which the noise occurs, and check the noise filter on the relevant part. First ensure that the noise is not coming from the outside. Failure to do so makes noise source detection difficult and may lead to a misdiagnosis. Noise should be removed in descending order of loudness. NG: INSTALL IT PROPERLY OK: GO TO NEXT STEP IDENTIFICATION OF NOISE SOURCE

Scheme 41

1. CHECK IF RADIO AUTO-SEARCH FUNCTIONS PROPERLY Check if the radio auto-search functions properly. Perform the auto-search of the radio and check that it functions normally. OK: The radio auto-search functions properly. OK: REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) ) NG: GO TO NEXT STEP
2. CHECK OPTIONAL COMPONENT Check optional component (sun shade film, telephone antenna, etc.). Check whether or not any optional component such as the sun shade film and the telephone antenna is installed. OK: Optional component is installed. OK: EFFECT FROM OPTIONAL COMPONENT NG: GO TO NEXT STEP
3. INSPECT RADIO RECEIVER ASSY (ANTENNA) Preparation for Check Remove the antenna plug of the radio receiver assembly. Noise Check With the radio receiver assy connector connected, turn the ignition switch to the ACC position. Turn on the radio and choose the AM mode. Place a screwdriver or a piece of metal such as thin wire on an antenna jack of the radio receiver assy and check that the noise is heard from the speaker. OK: Noise occurs. NG: REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) ) OK: GO TO NEXT STEP
4. CHECK ANTENNA ASSY Check that the antenna is securely installed. OK: The antenna is installed properly. NG: INSTALL ANTENNA ASSY PROPERLY OK: GO TO NEXT STEP
5. CHECK ANTENNA CORD SUB-ASSY Remove the antenna plug of the radio receiver assy and antenna assy. Measure the resistance between the antenna assy and radio receiver assy to check for an open circuit in the antenna cord sub-assy. Standard: Below 1 ohm Measure the resistance between the antenna cord sub-assy and body ground to check for a short circuit in the antenna cord sub-assy. Standard: 10 kohm or higher NG: REPLACE ANTENNA CORD SUB-ASSY (SEE «ANTENNA CORD SUB-ASSY»(ref-225516-S01379123782006031900000) ) OK: GO TO NEXT STEP
6. REPLACE AMPLIFIER ANTENNA ASSY (SEE «AMPLIFIER ANTENNA ASSY»(ref-225516-S03902415772006031900000) ) Replace the amplifier antenna assy and check if it operates normally. OK: The amplifier antenna assy operates normally. OK: NORMAL OPERATION NG: GO TO NEXT STEP REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) )

Scheme 42

1. CHECK IF A NORMAL CD IS INSERTED Check if a normal CD is inserted. Make sure that the CD is a normal audio CD, and that there is no deformation, flaw, stain, burr or other defects on the CD. OK: Normal audio CD is inserted. HINT: Translucent or oddly-shaped CD cannot be played. Computer CD-ROMs (even those with music) and CD-R discs cannot be played. Playing an 8-cm CD does not require an adapter. NG: CD IS FAULTY OK: GO TO NEXT STEP.
2. CHECK IF A CD IS INSERTED PROPERLY Check if a CD is inserted properly. Check whether or not the CD is inserted upside down. OK: Not upside down. NG: SET DISC CORRECTLY OK: GO TO NEXT STEP.
3. DISC CLEANING Disc cleaning If the disc gets dirty, clean the disc by wiping the surface from the center to outside in a radial direction with a soft cloth. NOTE: Do not use a conventional record cleaner or anti-static preservative. OK: Malfunction disappears. OK: DISC IS DIRTY NG: GO TO NEXT STEP.
4. REPLACE CD WITH ANOTHER AND RECHECK Replace the CD with another and recheck. Replace the CD with another normal one to see if the same trouble occurs again. OK: Malfunction disappears. NG: REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) ) OK: GO TO NEXT STEP. CD IS FAULTY

1. PRESS "EJECT" AND CHECK OPERATION Press "EJECT" and check the operation. Press the CD EJECT switch of the radio receiver assembly for 2 seconds or more to see if the CD is ejected. OK: CD is ejected. HINT: If the CD is not ejected, bring the vehicle in for repair. Do not attempt to remove it by force. NG: REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) ) OK: GO TO NEXT STEP.
2. REPLACE CD WITH ANOTHER AND RECHECK Replace the CD with another and recheck. Replace the CD with another normal one to see if the same trouble occurs again. OK: Malfunction disappears. NG: REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) ) OK: GO TO NEXT STEP. CD IS FAULTY

1. REPLACE CD WITH ANOTHER AND RECHECK Replace the CD with another one and recheck. Check the installation condition of the radio receiver assembly. OK: Malfunction disappears. NG: REPLACE RADIO RECEIVER ASSY (SEE «RADIO RECEIVER ASSY»(ref-225516-S33421425522006031900000) ) OK: GO TO NEXT STEP. CD IS FAULTY