Problem Symptoms Table

HINT:

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Audio function

AUDIO FUNCTION

Symptom	Suspected area	See
Pressing power switch does not turn on system.	1. Proceed to "PRESSING POWER SWITCH DOES NOT TURN ON SYSTEM "	PRESSING POWER SWITCH DOES NOT TURN ON SYSTEM
	2. Radio receiver power source circuit	RADIO RECEIVER POWER SOURCE CIRCUIT
	3. Multi-display power source circuit	MULTI-DISPLAY POWER SOURCE CIRCUIT
	4. AVC-LAN circuit	AVC-LAN CIRCUIT
	5. Radio receiver	TERMINALS OF ECU
	6. Multi-display	TERMINALS OF ECU
Panel switch does not function.	1. Steering pad switch circuit	STEERING PAD SWITCH CIRCUIT
	2. AVC-LAN circuit	AVC-LAN CIRCUIT
	3. Radio receiver	TERMINALS OF ECU
No sound can be heard from speakers (audio is mute).	1. AVC-LAN circuit	AVC-LAN CIRCUIT
	2. Radio receiver power source circuit	RADIO RECEIVER POWER SOURCE CIRCUIT
	3. Multi-display power source circuit	MULTI-DISPLAY POWER SOURCE CIRCUIT
	4. Proceed to "NO SOUND CAN BE HEARD FROM SPEAKERS "	NO SOUND CAN BE HEARD FROM SPEAKERS
	5. Stereo component amplifier power source circuit	STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
	6. Proceed to "SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER "	SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER
	7. Speaker circuit	SPEAKER CIRCUIT
	8. Proceed to "MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER "	MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER
	9. Stereo component amplifier	TERMINALS OF ECU
	10. Radio receiver	TERMINALS OF ECU
	11. Multi-display	TERMINALS OF ECU
Sound quality is bad in all modes (Volume is too low).	1. Proceed to "POOR SOUND QUALITY IN ALL MODELS (LOW VOLUME) "	POOR SOUND QUALITY IN ALL MODES (LOW VOLUME)
	2. Speaker circuit	SPEAKER CIRCUIT
	3. Proceed to "SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER "	SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER
	4. Proceed to "MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER "	MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER
Auto sound levelizer does not function (9 speaker system).	Proceed to "VEHICLE SPEED SIGNAL CIRCUIT BETWEEN STEREO COMPONENT AMPLIFIER AND COMBINATION METER "	VEHICLE SPEED SIGNAL CIRCUIT BETWEEN STEREO COMPONENT AMPLIFIER AND COMBINATION METER
Auto sound levelizer does not function (6 speaker system).	Proceed to "VEHICLE SPEED SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND COMBINATION METER "	VEHICLE SPEED SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND COMBINATION METER
External device sound cannot be heard or sound quality is bad (Stereo jack is used).	1. Radio receiver power source circuit	RADIO RECEIVER POWER SOURCE CIRCUIT
	2. Proceed to "SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO JACK ADAPTER "	SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO JACK ADAPTER
	3. Stereo jack adapter	-
	4. Radio receiver	TERMINALS OF ECU
Abnormal noise occurs.	1. Proceed to "NOISE OCCURS "	NOISE OCCURS
	2. Stereo component amplifier	TERMINALS OF ECU
	3. Radio receiver	TERMINALS OF ECU
Radio broadcast cannot be received or poor reception.	Proceed to "RADIO BROADCAST CANNOT BE RECEIVED OR POOR RECEPTION "	RADIO BROADCAST CANNOT BE RECEIVED OR POOR RECEPTION
CD cannot be inserted/played or CD is ejected right after insertion.	1. Radio receiver power source circuit	RADIO RECEIVER POWER SOURCE CIRCUIT
	2. Proceed to "CD CANNOT BE INSERTED/ PLAYED OR CD IS EJECTED RIGHT AFTER INSERTION "	CD CANNOT BE INSERTED/ PLAYED OR CD IS EJECTED RIGHT AFTER INSERTION
CD cannot be ejected.	1. Radio receiver power source circuit	RADIO RECEIVER POWER SOURCE CIRCUIT
CD cannot be ejected.	2. Proceed to "CD CANNOT BE EJECTED "	CD CANNOT BE EJECTED
Sound quality is bad only when CD is played.	Proceed to "SOUND QUALITY IS BAD ONLY WHEN CD IS PLAYED (VOLUME IS TOO LOW) "	SOUND QUALITY IS BAD ONLY WHEN CD IS PLAYED (VOLUME IS TOO LOW)
CD sounds skips.	Proceed to "CD SOUND SKIPS "	CD SOUND SKIPS
Radio receiver or multi-display cannot be illuminated at night.	Illumination circuit	ILLUMINATION CIRCUIT

Steering pad switch function

STEERING PAD SWITCH FUNCTION

Symptom	Suspected area	See
Audio system cannot be operated with steering pad switch.	1. Steering pad switch circuit	STEERING PAD SWITCH CIRCUIT
Audio system cannot be operated with steering pad switch.	2. Radio receiver	TERMINALS OF ECU
Steering pad switch cannot be illuminated at night.	Illumination circuit	ILLUMINATION CIRCUIT
Cellular phone registration failure, phone directory transfer failure.	Proceed to "CELLULAR PHONE REGISTRATION FAILURE, PHONE DIRECTORY TRANSFER FAILURE "	CELLULAR PHONE REGISTRATION FAILURE, PHONE DIRECTORY TRANSFER FAILURE
Cellular phone cannot send / receive.	1. Proceed to CELLULAR PHONE CANNOT SEND / RECEIVE	CELLULAR PHONE CANNOT SEND / RECEIVE
	2. Steering pad switch circuit	STEERING PAD SWITCH CIRCUIT
	3. Multi-display	TERMINALS OF ECU
Cannot call in a certain place.	Proceed to "CANNOT CALL IN A CERTAIN PLACE "	CANNOT CALL IN A CERTAIN PLACE
The other caller's voice cannot be heard, is too quiet, or distorted.	1. Proceed to "THE OTHER CALLER'S VOICE CANNOT BE HEARD, IS TOO QUIET, OR DISTORTED "	THE OTHER CALLER'S VOICE CANNOT BE HEARD, IS TOO QUIET, OR DISTORTED
	2. Multi-display	TERMINALS OF ECU
The other caller cannot hear your voice, or your voice is too quiet or distorted.	1. Proceed to "THE OTHER CALLER CANNOT HEAR YOUR VOICE, OR YOUR VOICE IS TOO QUIET OR DISTORTED "	THE OTHER CALLER CANNOT HEAR YOUR VOICE, DISTORTED OR YOUR VOICE IS TOO QUIET OR DISTORTED
	2. Microphone circuit between overhead J/B and multi-display	MICROPHONE CIRCUIT BETWEEN OVERHEAD J/B AND MULTI-DISPLAY
	3. Microphone	-
	4. Microphone amplifier	-
	5. Multi-display	TERMINALS OF ECU