1991 LEXUS SC400 Service Repair Manual

Page 641 of 4087

LEXUS SC400 1991  Service Repair Manual 
26CD playerWOOFER 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 th

Page 642 of 4087

LEXUS SC400 1991  Service Repair Manual 
27CD playerWOOFER 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 foll

Page 643 of 4087

LEXUS SC400 1991  Service Repair Manual 
28CD playerSOUND QUALITY POOR
Is radio operating normally?
Is speaker properly installed? Temporarily install another speaker
Functions OK? Temporarily install another CD auto changer.
Functions OK?

Page 644 of 4087

LEXUS SC400 1991  Service Repair Manual 
30NoiseNOISE 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 ampl

Page 645 of 4087

LEXUS SC400 1991  Service Repair Manual 
31NoiseNOISE PRODUCED WHEN ENGINE STARTS
Whistling noise which becomes high±pitched when
accelerator strongly depressed, disappears shortly
after engine stops.Whining noise occurs when A/C is operat

Page 646 of 4087

LEXUS SC400 1991  Service Repair Manual 
32AntennaANTENNA±RELATED
Does antenna extend when radio switched ON?Wire harness faulty.
Is there battery voltage between the following 
 terminals with connector disconnected?

 Motor antenna cont

Page 647 of 4087

LEXUS SC400 1991  Service Repair Manual 
Wire harness faulty.
Is there continuity between the following terminals
with connector disconnected?
  Radio receiver assembly A9 (*A1) ± Motor anten-
na control relay 4
  Radio receiver assembly

Page 648 of 4087

LEXUS SC400 1991  Service Repair Manual 
HORN SYSTEM
PARTS LOCATION
WIRING AND CONNECTOR DIAGRAMS
BE±262±
BODY ELECTRICAL SYSTEM HORN SYSTEM 
WhereEverybodyKnowsYourName