AV-32
AUDIO
Revision: November 20092006 QX56
Trouble DiagnosisEKS00BIG
The majority of the audio troubles are the result of outside causes (bad CD, electromagnetic interference,
etc.). Check the inspection items below to diagnose the malfunction.
MALFUNCTION WITH RADIO AND CD
Before proceeding, confirm that other AV switch functions (except audio functions) operate. If not, refer to AV-
155, "Unable to Operate All of AV Switches (Unable to Start Self-Diagnosis)" .
FOR RADIO ONLY
SymptomPossible cause
Inoperative
Audio unit power circuit check. Refer to AV- 3 5 , "Power Supply Circuit
Inspection" .
Audio communication line check. Refer to AV-136, "Audio Communication
Line Check (Between Display Control Unit and Audio Unit)" .
AV switch check. Refer to AV- 4 3 , "AV Switch Check" .
If above check is OK, replace audio unit.
Steering switch does not operate
Steering switch check. Refer to AV-41, "Steering Switch Check" .
AV switch check. Refer to AV- 4 3 , "AV Switch Check" .
If above check is OK, replace audio unit.
Audio information is not displayed on screen
Display unit check. Refer to AV- 11 2 , "Self-Diagnosis Mode (DCU)" .
All speakers do not sound
Audio unit
BOSE speaker amp. power supply and ground circuit check. Refer to AV- 3 5 ,
"Power Supply Circuit Inspection" .
BOSE speaker amp. ON signal
BOSE speaker amp.
One or several speakers do not sound
Front door speaker check. Refer to AV-44, "Sound Is Not Heard From Front
Door Speaker or Front Tweeter" .
Rear door speaker check. Refer to AV- 4 8 , "Sound Is Not Heard From Rear
Door Speaker or Rear Door Tweeter" .
Subwoofer check. Refer to AV- 5 2 , "Sound Is Not Heard From Subwoofer" .
Center speaker check. Refer to AV- 5 1 , "Sound Is Not Heard From Center
Speaker" .
Poor sound
Audio unit
BOSE speaker amp.
Speaker
Noisy
Audio unit
BOSE speaker amp.
Electrical equipment (generator, bonding wire, etc.)
Symptom Possible cause
No sound
Audio unit
Antenna feeder, wiring or connections
Antenna amplifier, power supply, wiring or connections
Noisy
Audio unit
Audio unit case ground
Antenna feeder, wiring or connections
Antenna amplifier, power supply, wiring or connections
Noise prevention parts
Each electrical equipment
Wire harness of each piece of electrical equipment
All radio stations stored in memory are deleted
Audio unit power circuit check. Refer to AV-35, "Power Supply Cir-
cuit Inspection" .
Audio unit
AV-34
AUDIO
Revision: November 20092006 QX56
Occurrence conditionPossible cause
Occurs only when engine is ON. A continuous growling noise occurs. The speed of
the noise varies with changes in the engine speed.
Ignition components
A whistling noise occurs while the engine speed is
high. A booming noise occurs while the engine is
running and the lighting switch is ON.
Generator
The occurrence of the noise is linked with the operation of the fuel pump.
Fuel pump condenser
Noise only occurs when various
electrical components are oper-
ating. A cracking or snapping sound occurs with the
operation of various switches.
Relay malfunction, audio unit malfunction
The noise occurs when various motors are operat-
ing.
Motor case ground
Motor
The noise occurs constantly, not just under certain conditions.
Rear defogger coil malfunction
Open circuit in printed heater
Poor ground of antenna amplifier or
antenna feeder line
A cracking or snapping sound occurs while the vehicle is being driven, especially
when it is vibrating excessively.
Ground wire of body parts
Ground due to improper part installation
Wiring connections or a short circuit
