1991 LEXUS SC400 Service Repair Manual

Page 625 of 4087

LEXUS SC400 1991  Service Repair Manual 
B. with CD player type
Is radio operating normally?Radio receiver assembly faulty.
Is there continuity between the following terminals
with connector disconnected?
  Radio receiver amplifier B1 ± P

Page 626 of 4087

LEXUS SC400 1991  Service Repair Manual 
14Tape playerANY SPEAKER DOES NOT WORK (EXCEPT
WOOFER)
A. without CD player type
Is there continuity between the following terminals
with connector disconnected?
 Fr: Radio receiver assembly A1±FR

Page 627 of 4087

LEXUS SC400 1991  Service Repair Manual 
B. with CD player type
Is there continuity between the following terminals
with connector disconnected?
 Fr: Power amplifier B1±FR speaker 1
Power amplifier B5±FR speaker 2
  FL: Power amplifier

Page 628 of 4087

LEXUS SC400 1991  Service Repair Manual 
Radio receiver assembly faulty.Power amplifier faulty.
Temporarily install another power amplifier.
Function is OK?
BE±242±
BODY ELECTRICAL SYSTEM AUDIO SYSTEM 
WhereEverybodyKnowsYourName

Page 629 of 4087

LEXUS SC400 1991  Service Repair Manual 
15Tape playerVOLUME FAINT (EXCEPT WOOFER)
A. without CD player type
Is radio operating normally?Radio receiver assembly faulty.
When the volume switch is turned from minumum to
maximum, does resistan

Page 630 of 4087

LEXUS SC400 1991  Service Repair Manual 
16Tape playerWOOFER DOES NOT WORK
A. without CD player type
Is radio operating normally?Radio receiver assembly faulty.
Wire harness faulty.
Is there battery voltage between the following ter-
minals

Page 631 of 4087

LEXUS SC400 1991  Service Repair Manual 
B. with CD player type
HINT: The part names and terminals indicated in brackets ( ) are for model\
s with a Nakamichi system.
Is radio operating normally?Radio receiver assembly faulty.
Woofer faulty

Page 632 of 4087

LEXUS SC400 1991  Service Repair Manual 
17Tape playerWOOFER VOLUME FAINT
A. without CD player type
Is radio operating normally?Radio receiver assembly faulty.
Wire harness faulty.
Is there continuity between the following terminals
with co