1991 LEXUS SC300 wiring

Wiring and Connector Diagrams
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BODY ELECTRICAL SYSTEM Audio SystemBE±201
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Wiring and Connector Diagrams
±
BODY ELECTRICAL SYSTEM Audio SystemBE±203
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Wiring and Connector Diagrams
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BODY ELECTRICAL SYSTEM Audio SystemBE±205
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(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.
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BODY ELECTRICAL SYSTEM Audio SystemBE±207
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(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
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BODY ELECTRICAL SYSTEM Audio System
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(c) Disconnect the connector and remove the wooferamplifier.
2. INSTALL WOOFER AMPLIFIER For installation, follow the removal procedure in reverse.
INSPECTION OF WOOFER AMPLIFIER
INSPECT WOOFER AMPLIFIER
(Circuit)
Disconnect the connector from woofer amplifier and inspect
the connector on the wire harness side as shown.
Check forTester connectionConditionSpecified value
Continuity7±GroundConstantContinuity
Voltage3±GroundConstantBattery voltage
4±GroundIgnition switch positionACC or ONBattery voltage
6±Ground
g
LOCKNo voltage
If circuit is not as specified, refer to BE±201 wiring diagrams
and inspect the circuits connected to other parts.
(Power Amplifier)
REMOVAL AND INSTALLATION OF
POWER AMPLIFIER
(Pioneer)
1. REMOVE POWER AMPLIFIER (a) Remove the RH side cover.
(b) Remove the CD auto changer (See page BE±212).
(c) Disconnect two connectors and remove three nuts and the power amplifier with the bracket.
(d) Remove four bolts and the power amplifier.
2. INSTALL POWER AMPLIFIER For installation, follow the removal procedure in reverse.
BE±210
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BODY ELECTRICAL SYSTEM Audio System
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(Nakamichi)
1. REMOVE POWER AMPLIFIER
(a) Remove the RH side cover.
(b) Remove the CD auto changer (See page BE±212).
(c) Disconnect three connectors and remove three nuts and the power amplifier with the bracket.
(d) Remove four bolts and the power amplifier.
2. INSTALL WOOFER AMPLIFIER For installation follow the removal procedure in reverse.
POWER AMPLIFIER INSPECTION
INSPECT POWER AMPLIFIER
(Circuit)
Disconnect the connector from power amplifier and inspect
the connector on the wire harness side as shown.
(Produced by PIONEER)
 Check for Tester connection Condition Specified value
 Continuity B7±Ground Constant Continuity
 Voltage B10±Ground Constant Battery positive voltage
  A14±Ground
A6 G d
 Ignition switch position ACC or ON Battery positive voltage  A6±Ground  LOCK No voltage
If circuit is not as specified, refer to BE±201 wiring diagrams
and inspect the circuits connected to other parts.
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BODY ELECTRICAL SYSTEM AUDIO SYSTEMBE±211
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(Produced by NAKAMICHI)
 Check for Tester connection Condition Specified value 

Continuity 

B7±Ground
C7±Ground 


Constant


Continuity
 

Voltage 

B10±Ground
C3±Ground 


Constant


Battery positive voltage
 


 

A6±Ground
A14±Ground 


Ignition switchposition
 


ACC or ON

Battery positive voltage
 


 


C4±Ground
C6±Ground 


Ignition switch position 


LOCK

No voltage
If circuit is not as specified, refer to
BE±203 wiring diagrams
and inspect the circuits connected to other parts.
CD AUTO CHANGER
CD AUTO CHANGER REMOVAL AND
INSTALLATION
1. REMOVE CD AUTO CHANGER (a) Remove RH side cover.
(b) Disconnect two connectors.
(c) Remove three bolts, one nut and the CD auto changer.
CD AUTO CHANGER INSPECTION
INSPECT CD AUTO CHANGER(Circuit)
Disconnect connectors from CD auto changer and inspect
the connector on the wire harness side as shown.
BE±212
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BODY ELECTRICAL SYSTEM AUDIO SYSTEM
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