2004 INFINITI QX56 Factory Service Manual

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Page 617 of 3371

INFINITI QX56 2004 Factory Service Manual AV-30
AUDIO
Revision: August 20072004 QX56
FOR CD ONLY
Noise InspectionEKS007KK
The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunctioning.
Check i

AV-30
AUDIO
Revision: August 20072004 QX56
FOR CD ONLY
Noise InspectionEKS007KK
The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunctioning.
Check if noise is caused and/or changed by engine speed, ignition switch turned to each position, and opera-
tion of each piece of electrical equipment, and determine the cause.
NOTE:
The source of the noise can be found easily by listening to the noise while removing the fuses of electrical
components, one by one.
TYPE OF NOISE AND POSSIBLE CAUSE
Power Supply Circuit InspectionEKS007KL
1. CHECK FUSES
Check that the following fuses are not blown.
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of problem before installing new fuse. Refer to PG-4,
"POWER SUPPLY ROUTING CIRCUIT" .
Symptom Possible cause
CD cannot be inserted.
CD
Audio unit CD cannot be ejected.
The CD cannot be played.
The sound skips, stops suddenly, or is distorted.
Occurrence condition Possible 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
Unit Terminals Signal name Fuse No.
Audio unit6 Battery power 31
10 Ignition switch ACC or ON 4
AV s w i t c h1 Battery power 31
2 Ignition switch ACC or ON 4
BOSE speaker amp. 1 Battery power 31
Subwoofer 6 Battery power 17

Page 618 of 3371

INFINITI QX56 2004 Factory Service Manual AUDIO
AV-31
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Revision: August 20072004 QX56
2. POWER SUPPLY CIRCUIT CHECK
1. Disconnect audio unit, subwoofer or BOSE speaker amp. connector.
2. Check voltage between the aud

Page 619 of 3371

INFINITI QX56 2004 Factory Service Manual AV-32
AUDIO
Revision: August 20072004 QX56
Steering Switch CheckEKS007KM
1. AV SWITCH SELF-DIAGNOSIS FUNCTION CHECK
1. Start AV switch self-diagnosis function. Refer to AV- 2 7 , "
AV Switch Self-Dia

Page 620 of 3371

INFINITI QX56 2004 Factory Service Manual AUDIO
AV-33
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Revision: August 20072004 QX56
4. CHECK STEERING SWITCH RESISTANCE
Check resistance between steering switch terminals.
OK or NG
OK >> Inspection End.
NG >> Replac

Page 621 of 3371

INFINITI QX56 2004 Factory Service Manual AV-34
AUDIO
Revision: August 20072004 QX56
Sound Is Not Heard From Front Door Speaker or Front TweeterEKS007KR
1. HARNESS CHECK
1. Disconnect BOSE speaker amp. connector M113 and suspect speaker conne

Page 622 of 3371

INFINITI QX56 2004 Factory Service Manual AUDIO
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Revision: August 20072004 QX56
2. FRONT SPEAKER SIGNAL CHECK
1. Connect BOSE speaker amp. connector M113 and suspect speaker connector.
2. Turn ignition switch to

Page 623 of 3371

INFINITI QX56 2004 Factory Service Manual AV-36
AUDIO
Revision: August 20072004 QX56
3. HARNESS CHECK
1. Disconnect audio unit connector and BOSE speaker amp. connector.
2. Check continuity between audio unit harness connector terminal
and BO

Page 624 of 3371

INFINITI QX56 2004 Factory Service Manual AUDIO
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Revision: August 20072004 QX56
4. FRONT SPEAKER SIGNAL CHECK
1. Connect audio unit connector and BOSE speaker amp. connector.
2. Turn ignition switch ACC.
3. Push

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