1991 LEXUS SC300 CD player

MAINTENANCE OF TAPE PLAYER
Head Cleaning
Using a moist±type cleaning tape, clean the head surface, pinch rolle\
rs and capstans.
COMPACT DISC PLAYER
Compact Disc (hereafter called ºCDº) players use a laser beam pick±up\
to read the digital signals recorded
on the CD and reproduce analog signals of the music, etc. There are 4.7 in\
. (12 cm) and 3.2 in. (8 cm) CD
available, but it is recommended that you do not use 3.2 in. (8 cm) discs in the\
CD auto changer.
HINT: Never attempt to disassemble or oil any part of the player unit. Do not\
insert any object other than
a disc into the magagine.
NOTICE: CD players use on invisible laser laser beam which could cause hazardou\
s radiation expo-
sure. Be sure to operate the player correctly as instructed.
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BODY ELECTRICAL SYSTEM Audio SystemBE±197
WhereEverybodyKnowsYourName

(Circuit)
Disconnect the control panel connector and inspect the con-
nector on wire harness side as shown.
Check forTester connectionConditionSpecified value
Voltage2±GroundLight control switch positionTAIL or HEADBattery voltage
OFFNo voltage
If circuit is not as specified, refer to BE±199, 201, 203 wiring
diagrams and inspect the circuits connected to other parts.
(Radio Receiver Assembly)
REMOVAL AND INSTALLATION OF
RADIO RECEIVER ASSEMBLY
(See page BE±112)
INSPECTION OF RADIO RECEIVER
ASSEMBLY
INSPECT RADIO RECEIVER ASSEMBLY
(Circuit)
Disconnect the connectors from the radio receiver assembly.
And inspect the connector on the wire harness side as
shown.
(without CD player)
Check forTester connectionConditionSpecified value
ContinuityA7±GroundConstantContinuity
VoltageA4±GroundConstantBattery voltage
VoltageA3±GroundIgnition switch positionACC or ONBattery voltageg
LOCKNo voltage
A10±GroundLight control switch positionTAIL or HEADBattery voltageg
OFFNo voltage
If circuit is not as specified, refer to BE±199 wiring diagrams
and inspect the circuits connected to other parts.
±
BODY ELECTRICAL SYSTEM Audio SystemBE±207
WhereEverybodyKnowsYourName

(With CD player)
Check forTester connectionConditionSpecified value
VoltageA4±GroundConstantBattery voltage
A3±GroundIgnition switch positionACC or ONBattery voltageg
LOCKNo voltage
A2±GroundLight control switchTAIL or HEADBattery voltageg
positionOFFNo voltage
If circuit is not as specified, refer to BE±201, 203 wiring dia-
grams and inspect the circuits connected to other parts.
HINT: Check the wire harness between radio receiver assem-
bly and the CD auto changer, between radio receiver assem-
bly and power amplifier, in accordance with the wiring dia-
grams in BE±201, 203.
(Front Door Speaker)
REMOVAL AND INSTALLATION OF
FRONT DOOR SPEAKER
(See page BO±35)
(Tweeter)
REMOVAL AND INSTALLATION OF
TWEETER
(See page BO±34)
(Rear Speaker)
REMOVAL AND INSTALLATION OF
REAR SPEAKER
1. REMOVE REAR SPEAKER
(a) Remove the package tray trim.
HINT: (See page BO±124)
(b) Remove eight bolts.
(c) Disconnect connectors and remove the rear speaker.
2. INSTALL REAR SPEAKER For installation, follow the removal procedure in reverse.
BE±208
±
BODY ELECTRICAL SYSTEM Audio System
WhereEverybodyKnowsYourName

(Woofer)
REMOVAL AND INSTALLATION OF
WOOFER
1. REMOVE WOOFER(a) Remove woofer cover together with high mount stoplight.
(b) Remove four bolts.
(c) Disconnect connector and remove woofer.
2. INSTALL WOOFER For installation follow the removal procedure in reverse.
(Woofer Amplifier)
REMOVAL AND INSTALLATION OF
WOOFER AMPLIFIER
(without CD player)
1. REMOVE WOOFER AMPLIFIER(a) Remove the RH side cover.
(b) Disconnect the connector and remove three nuts and
the woofer amplifier with the bracket.
(c) Remove four bolts and the woofer amplifier.
2. INSTALL WOOFER AMPLIFIER
For installation, follow the removal procedure in reverse.
(with CD player±Pioneer)
1. REMOVE WOOFER AMPLIFIER (a) Remove the package tray trim.
HINT: (See page BO±124)
(b) Remove four bolts.
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BODY ELECTRICAL SYSTEM Audio SystemBE±209
WhereEverybodyKnowsYourName

MOTOR ANTENNA
MOTOR ANTENNA REMOVAL AND
INSTALLATION
1. REMOVE MOTOR ANTENNA
(a) Remove the antenna nut.
(b) Remove the LH side cover.
(c) Disconnect the motor antenna connector and the antennacord.
(d) Remove the nut and the motor antenna assembly.
2. INSTALL MOTOR ANTENNA
(a) Install the antenna nut.
(b) Connect the motor antenna connector and the antenna cord.
(c) Install the nut.
ANTENNA ROD REMOVAL AND
INSTALLATION
1. REMOVE ANTENNA ROD HINT: Perform this operation with the battery negative (±)
cable connected to the battery terminal.
(a) Turn the ignition switch to ºLOCKº position.
(b) Remove the antenna nut.
(c±1) with CD player
Press the ºAMº and ºCDº buttons on the radio receiver, and
simultaneously turn the ignition switch to ºACCº position.
(c±2) without CD player Press the ºAMº and ºT APEº buttons on the radio receiver, and
simultaneously turn the ignition switch to ºACCº position.
HINT:
w The rod will extend fully and be released from the motor
antenna.
w After removing the antenna rod, leave the ignition switch
at ºACCº.
NOTICE: To prevent body damage when the antenna rod is re-
leased, hold the rod while it comes out.
BE±214±
BODY ELECTRICAL SYSTEM AUDIO SYSTEM
WhereEverybodyKnowsYourName

TROUBLESHOOTING
NOTICE: When replacing the internal mechanism (ECU part) of the audio system,\
be careful that no part
of your body or clothing comes in contact with the terminals of the lead\
s from the IC, etc. of the replace-
ment part (spare part).
HINT:
This inspection procedure is simple troubleshooting which should be carried \
out on the vehicle during
system operation and is based on the assumption that the cause of trouble lies\
with the system
components (excluding the wires and connectors, etc.).
Always inspect the trouble taking the following items into consideration\
.
Open or short circuit of the wire harness

Connector or terminal connection fault

The cassette tape or compact disc itself may be causing the trouble, so whe\
n troubleshooting the tape
player or CD player, always use a different cassette tape or compact disc first of all to check operation
of the tape player or CD player.

For some of problems in the following problem chart, the AUDIO SYSTEM CHECKER can be used
to inspect malfunctions of the Radio or Tape Player, and the CD PLAYER CHECKER can be used to
inspect the CD player.
The portions indicated by on the flow charts on the following pages can be\
inspected using a CHECK-
ER.
For instructions on how to connect the checker to the vehicle and how to\
use the checker, please refer
to the instruction Manual for AUDIO SYSTEM CHECKER or CD PLAYER CHECKER.
BE±218
±
BODY ELECTRICAL SYSTEM AUDIO SYSTEM
WhereEverybodyKnowsYourName

 
\
 \

Problem No.
 \
 \
Radio not operating when power switch turned to ºONº 1
 


\
 
\

\

Display indicates when power switch turned to ºONº, but no sound (\
including ºnoiseº)
is produced (except woofer). 


2
 \
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Noise present, but AM±FM not operating 3
 
Radio
\
 \
Any speaker does not work (except woofer). 4
 Radio\
 \
Volume faint (except woofer). 5 \
 \
Woofer does not work. 6 


\
 
\

\
Woofer volume faint. 

7
 \
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Reception poor. 8
 \
 \
Preset memory disappears. 9
 \
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Volume remains at maximum level. 10
 \
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Cassette tape cannot be inserted. 11
 \
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Cassette tape will not eject. 12
 \
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Display indicates, but no sound is produced (except woofer). 13 \
 \
Any speaker does not work (except woofer). 14 

Tape player
\
 
\

\
Volume faint (except woofer). 

15
 \
 \
Woofer does not work. 16
 \
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Woofer volume faint. 17
 \
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Sound quality poor. 18
 \
 \
Volume remains at maximum level. 19
 \
 \
Magazine cannot be inserted into auto changer. 20
 \
 \
Magazine is inserted, but display does not indicate ºCDº. 21 \
 \
Display indicates, but no sound is produced (except woofer). 22 


\
 
\

\
Any speaker does not work (except woofer). 

23
 CDplayer\
 \
Volume faint (except woofer). 24
 CD player\
 \
RH channel or LH channel speaker volume faint. 25
 \
 \
Woofer does not work. 26
 \
 \
Woofer volume faint. 27
 \
 \
Sound quality poor. 28
 \
 \
Volume remains at maximum level. 29 
Noise
\
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Noise produced by vibration or shock while driving. 30 


Noise\
 
\

\
Noise produced when engine starts. 

31
 Antenna\
 \
Antenna±related. 32
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BODY ELECTRICAL SYSTEM AUDIO SYSTEMBE±219
WhereEverybodyKnowsYourName

1RadioRADIO NOT OPERATING WHEN POWER
SWITCH TURNED TO ºONº.
A. Without CD player type
Does radio operate normally when AM or FM
button is pushed?
Check if RADIO NO.1 and RADIO NO.2 fuses
are OK.Is there battery voltage between the following
terminals with connector connected?

Radio receiver assembly A3±ground

Radio receiver assembly A4±ground
Is there continuity between the following termi-
nals with connector disconnected?

Radio receiver assembly A11±ground Radio receiver assembly faulty.Wire harness faulty
Wire Harness faulty.
Replace fuse.
Inspect power switch. Wire harness faulty.
Is there continuity between the following terminals
with connector disconnected?


Radio receiver assembly B2±power switch 12

Radio receiver assembly B4±power switch 11
Wire Harness faulty.
Is there battery voltage between the following
terminals with connector connected?


Radio receiver assembly A11±Power
amplifier A11
Is there continuity between the following termi-
nals with connector disconnected?

Power amplifier B7±ground
Power amplifier faulty.
BE±220±
BODY ELECTRICAL SYSTEM AUDIO SYSTEM
WhereEverybodyKnowsYourName