Problem Symptoms Table

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Before inspecting the suspected areas listed in the table below, check the fuse and relay.
Before inspecting the suspected areas listed in the table below, check the DTCs.
Methods used to verify the cause of the problem are listed in order of probability in the suspected area column.

Audio Function:

AUDIO FUNCTION PROBLEM SYMPTOMS REFERENCE

Symptom	Suspected area
Pressing power switch does not turn on system.	1. "PRESSING POWER SWITCH DOES NOT TURN ON SYSTEM "
	2. RADIO RECEIVER POWER SOURCE CIRCUIT
	3. AVC-LAN CIRCUIT
	4. REPLACE RADIO RECEIVER
Panel switch does not function.	1. STEERING PAD SWITCH CIRCUIT
	2. AVC-LAN CIRCUIT
	3. REPLACE RADIO RECEIVER
No sound can be heard from speakers (audio is mute).	1. RADIO RECEIVER POWER SOURCE CIRCUIT
	2. "NO SOUND CAN BE HEARD FROM SPEAKERS (AUDIO IS MUTE) "
	3. STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
	4. SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER
	5. SPEAKER CIRCUIT
	6. MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER
	7. MUTE SIGNAL CIRCUIT BETWEEN NAVIGATION ECU AND STEREO COMPONENT AMPLIFIER
	8. Replace stereo component amplifier. See REMOVAL
	9. REPLACE RADIO RECEIVER
Sound cannot be heard only from front speaker (driver side). (Volume is too low.) (Only with navigation system)	1. DRIVER SIDE SPEAKER CIRCUIT
	2. SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER
	3. Replace stereo component amplifier. See REMOVAL
	4. REPLACE RADIO RECEIVER
Sound quality is bad in all modes. (Volume is too low.)	1. "POOR SOUND QUALITY IN ALL MODES (LOW VOLUME) "
	2. SPEAKER CIRCUIT
	3. SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER
	4. MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND STEREO COMPONENT AMPLIFIER
	5. MUTE SIGNAL CIRCUIT BETWEEN NAVIGATION ECU AND STEREO COMPONENT AMPLIFIER
	6. Replace stereo component amplifier. See REMOVAL
	7. REPLACE RADIO RECEIVER
ASL does not function.	1. VEHICLE SPEED SIGNAL CIRCUIT BETWEEN STEREO COMPONENT AMPLIFIER AND COMBINATION METER
Sound cannot be heard or sound quality is bad. (RSE sound)	1. RADIO RECEIVER POWER SOURCE CIRCUIT
	2. MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT
	3. SOUND SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND MULTI-DISPLAY CONTROLLER
	4. REPLACE RADIO RECEIVER
	5. REPLACE MULTI-DISPLAY CONTROLLER
Abnormal noise occurs.	1. "NOISE OCCURS "
	2. Replace stereo component amplifier. See REMOVAL
	3. REPLACE RADIO RECEIVER
Radio broadcast cannot be received (poor reception).	1. "RADIO BROADCAST CANNOT BE RECEIVED (POOR RECEPTION) "
CD cannot be inserted/played or CD is ejected right after insertion.	1. RADIO RECEIVER POWER SOURCE CIRCUIT
	2. "CD CANNOT BE INSERTED/PLAYED OR CD IS EJECTED RIGHT AFTER INSERTION "
CD cannot be ejected.	1. RADIO RECEIVER POWER SOURCE CIRCUIT
CD cannot be ejected.	2. "CD CANNOT BE EJECTED "
Sound quality is bad only when playing CD. (Volume is too low.)	1. "SOUND QUALITY IS BAD ONLY WHEN CD IS PLAYED (VOLUME IS TOO LOW) "
CD sound skips.	1. "CD SOUND SKIPS "
Cassette tape cannot be inserted or played.	1. RADIO RECEIVER POWER SOURCE CIRCUIT
Cassette tape cannot be inserted or played.	2. "CASSETTE TAPE CANNOT BE INSERTED OR PLAYED "
Cassette tape cannot be ejected.	1. RADIO RECEIVER POWER SOURCE CIRCUIT
Cassette tape cannot be ejected.	2. "CASSETTE TAPE CANNOT BE EJECTED "
Sound quality is bad only when playing tape.	1. "SOUND QUALITY IS BAD ONLY WHEN PLAYING TAPE "
Tape is tangled due to incorrect tape speed or auto-reverse malfunction.	1. "TAPE IS TANGLED DUE TO INCORRECT TAPE SPEED OR AUTO-REVERSE MALFUNCTION "
Radio receiver cannot be dimmed in night time.	1. DIMMER SIGNAL CIRCUIT
Radio receiver cannot be dimmed in night time.	2. REPLACE RADIO RECEIVER
Radio receiver cannot be illuminated in night time.	1. ILLUMINATION CIRCUIT
Radio receiver cannot be illuminated in night time.	2. REPLACE RADIO RECEIVER

Steering Pad Switch Function:

STEERING PAD SWITCH FUNCTION PROBLEM SYMPTOMS REFERENCE

Symptom	Suspected area
Audio system cannot be operated with steering pad switch.	1. STEERING PAD SWITCH CIRCUIT
Audio system cannot be operated with steering pad switch.	2. REPLACE RADIO RECEIVER