Lexus SC300 / Lexus SC400. Manual — part 161
26
CD player
WOOFER DOES NOT WORK
HINT: The part names and terminals indicated in brackets ( ) are for models with a Nakamichi system.
Is radio operating normally?
Is there battery voltage between the following ter-
minals with connector connected?
Woofer amplifier 3 (Power amplifier C3) – ground
Woofer amplifier 4 (Power amplifier C4) – ground
Woofer faulty
Radio receiver assembly faulty.
Wire harness faulty.
Wire harness faulty.
Wire harness faulty.
Wire harness faulty.
Wire harness faulty.
Is there battery voltage between the following ter-
minals with connector connected?
Woofer amplifier 6 (Power amplifier C6) – ground
Is there continuity between the following terminals
with connector disconnected?
Woofer amplifier 7 (Power amplifier C7) – ground
Is there continuity between the following terminals
with connector disconnected?
Woofer amplifier 9 (Power amplifier C9) –
Woofer speaker 2
Woofer amplifier 10 (Power amplifier C10) –
Woofer speaker 1
Is there continuity between the following terminals
with connector disconnected?
Woofer amplifier 9 (Power amplifier C9) – ground
Woofer amplifier10 (Power amplifier C10) – ground
Temporarily install another woofer.
Functions OK?
Radio receiver assembly faulty.
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
BE–255
27
CD player
WOOFER VOLUME FAINT
HINT: The part names and terminals indicated in brackets ( ) are for models with a Nakamichi system.
Is radio operating normally?
Is there continuity between the following terminals
with connector disconnected?
Radio receiver assembly D1 – Woofer amplifier 1
(Power amplifier 1 (Power amplifier C1)
Radio receiver assembly D5 – Woofer amplifier 1
(Power amplifier 5 (Power amplifier C5)
Radio receiver assembly faulty.
Wire harness faulty.
Wire harness faulty.
Woofer amplifier faulty.
Radio receiver assembly faulty.
Temporarily install another woofer amplifier.
Functions OK?
Is there continuity between the following terminals
with connector disconnected?
Radio receiver assembly D1 – ground
Radio receiver assembly D5 – ground
BE–256
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
28
CD player
SOUND QUALITY POOR
Is radio operating normally?
Is speaker properly installed?
Temporarily install another speaker
Functions OK?
Temporarily install another CD auto changer.
Functions OK?
Temporarily install another power amplifier.
Functions OK?
Radio receiver assembly faulty.
Speaker faulty.
Speaker installation faulty
Power amplifier faulty.
Radio receiver assem-
bly faulty
CD changer faulty.
29
CD player
VOLUME REMAINS AT MAXIMUM LEVEL
Is radio operating normally?
Radio receiver assembly faulty.
Wire harness faulty.
Is there continuity between the following terminals
with connector disconnected?
Radio receiver assembly B1 – Power switch 14
Radio receiver assembly B3 – Power switch 11
Power switch faulty.
Radio receiver assembly faulty.
When the volume switch is turned from minimum to
maximum, does resistance between terminal 11–14
of power switch changes from 0 to 50 k
?
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
BE–257
30
Noise
NOISE PRODUCED BY VIBRATION OR SHOCK
WHILE DRIVING
Is radio properly installed?
Is radio receiver assembly properly installed?
*1 Is radio power amplifier properly installed?
*2 Is woofer amplifier properly installed?
*1 Is CD auto changer properly installed?
With vehicle stopped, lightly tap each part.
Is noise produced?
Speaker installation faulty.
Radio receiver assembly installation faulty.
Power amplifier installation faulty.
Woofer amplifier installation faulty.
CD auto changer installation faulty.
Each part faulty.
Noise produced by static electricity is accululating in the vehicle body.
BE–258
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
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