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:

Inspect the "Fuse" and "Relay" before confirming the suspected area as shown in the table below.

DISPLAY:

PROBLEM SYMPTOMS REFERENCE

Symptom	Suspected area
Black screen.	1. MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT
	2. REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	3. AVC-LAN CIRCUIT
	4. REPLACE MULTI-DISPLAY CONTROLLER
	5. Replace rear display assembly. See REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
Display screen is not stabilized (Synchronous error).	1. MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT
	2. REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	3. DISPLAY SIGNAL CIRCUIT BETWEEN REAR DISPLAY ASSEMBLY AND MULTI-DISPLAY CONTROLLER
	4. Replace rear display assembly. See REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	5. REPLACE MULTI-DISPLAY CONTROLLER
Color on display screen is unusual (RGB signal error).	1. Rear display color bar check in display check mode. See DISPLAY CHECK MODE
	2. DISPLAY SIGNAL CIRCUIT BETWEEN REAR DISPLAY ASSEMBLY AND MULTI-DISPLAY CONTROLLER
	3. Replace rear display assembly. See REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	4. REPLACE MULTI-DISPLAY CONTROLLER
Navigation display appears on the multi-display, but does not appear on the rear display assembly.	1. DISPLAY SIGNAL CIRCUIT BETWEEN REAR DISPLAY ASSEMBLY AND MULTI-DISPLAY CONTROLLER
	2. Replace rear display assembly. See REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	3. REPLACE MULTI-DISPLAY CONTROLLER
Only DVD screen is not displayed or not stabilized.	1. MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT
	2. REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	3. DISPLAY SIGNAL CIRCUIT BETWEEN REAR DISPLAY ASSEMBLY AND MULTI-DISPLAY CONTROLLER
	4. Replace rear display assembly. See REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	5. REPLACE MULTI-DISPLAY CONTROLLER
Only display screen input from the external device is not displayed or not stabilized.	1. MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT
	2. REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	3. DISPLAY SIGNAL CIRCUIT BETWEEN VIDEO TERMINAL AND MULTI-DISPLAY CONTROLLER
	4. REPLACE VIDEO TERMINAL
	5. REPLACE MULTI-DISPLAY CONTROLLER
	6. Replace rear display assembly. See REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT

SOUND:

SOUND PROBLEM SYMPTOMS REFERENCE

Symptom	Suspected area
Quality of sound from wireless headphone is poor or no sound can be heard.	1. MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT
	2. REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	3. SOUND SIGNAL CIRCUIT BETWEEN REAR DISPLAY ASSEMBLY AND MULTI-DISPLAY CONTROLLER (WIRELESS HEADPHONE)
	4. MUTE SIGNAL CIRCUIT BETWEEN REAR DISPLAY ASSEMBLY AND MULTI-DISPLAY CONTROLLER
	5. MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER ASSEMBLY AND MULTI-DISPLAY CONTROLLER
	6. REPLACE MULTI-DISPLAY CONTROLLER
	7. Replace rear display assembly. See REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
Quality of sound from headphone connected to headphone terminal is poor or no sound can be heard.	1. MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT
	2. REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	3. SOUND SIGNAL CIRCUIT BETWEEN REAR DISPLAY ASSEMBLY AND MULTI-DISPLAY CONTROLLER (HEADPHONE)
	4. MUTE SIGNAL CIRCUIT BETWEEN REAR DISPLAY ASSEMBLY AND MULTI-DISPLAY CONTROLLER
	5. MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER ASSEMBLY AND MULTI-DISPLAY CONTROLLER
	6. REPLACE MULTI-DISPLAY CONTROLLER
	7. Replace rear display assembly. See REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
Only DVD sound cannot be heard or the sound quality is poor.	1. MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT
	2. REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	3. SOUND SIGNAL CIRCUIT BETWEEN REAR DISPLAY ASSEMBLY AND MULTI-DISPLAY CONTROLLER
	4. MUTE SIGNAL CIRCUIT BETWEEN RADIO RECEIVER AND MULTI-DISPLAY CONTROLLER
	5. REPLACE MULTI-DISPLAY CONTROLLER
	6. Replace rear display assembly. See REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
Only sound quality input from the external device is poor or no sound can be heard.	1. MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT
	2. REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	3. DISPLAY SIGNAL CIRCUIT BETWEEN VIDEO TERMINAL AND MULTI-DISPLAY CONTROLLER
	4. REPLACE VIDEO TERMINAL
	5. REPLACE MULTI-DISPLAY CONTROLLER
	6. Replace rear display assembly. See REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT

REMOTE CONTROL:

REMOTE CONTROL PROBLEM SYMPTOMS REFERENCE

Symptom	Suspected area
A remote control system does not operate.	1. MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT
	2. REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT
	3. A REMOTE CONTROL SYSTEM DOES NOT OPERATE
	4. AVC-LAN CIRCUIT
	5. REPLACE MULTI-DISPLAY CONTROLLER
	6. Replace rear display assembly. See REAR DISPLAY ASSEMBLY POWER SOURCE CIRCUIT