TOYOTA SUPRA 1995 Service Repair Manual

Tape PlayerWOOFER SPEAKER DOES NOT WORK
w/ Power Amplifier
Check if RAD No. 2 fuse is OK?Replace fuse.
Is radio operating normally?Radio receiver assembly faulty.
Check if GND to power amplifier is OK.GND faulty.
Is +B applied to power amplifier?+B wire harness faulty.
Is AMP applied to power amplifier?Check the radio receiver assembly.
Is there continuity in wire harness?
(Radio receiver to power amplifier)Wire harness faulty.
Temporarily install another woofer speaker.
Functions OK?Woofer speaker faulty.
Is there continuity in speaker wire harness?Speaker wire harness faulty.
Temporarily install another power amplifier.
Functions OK?Radio receiver assembly faulty.
Power amplifier faulty.
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±99

Function OK if different cassette
tape installed?
Operates normally after cleaning the heads?
(See MAINTENANCE OF TAPE PLAYER)
Cassette tape faulty?
Tape PlayerSOUND QUALITY POOR (VOLUME FAINT)
Tape PlayerTAPE JAMMED, MALFUNCTION WITH TAPE SPEED
OR AUTO REVERSE
Head dirty.
Is radio operating normally?Radio assembly faulty.
Is speaker properly installed?Install properly.
Temporarily install another speaker.
Functions OK?Speaker faulty.
Radio assembly faulty.
Radio assembly or power amplifier faulty.
Functions OK is different tape (less
than 120 mins.) is installed?Cassette tape faulty.
is there a foreign object inside tape player?Remove foreign object.
Operates normally after cleaning the heads?
(See MAINTENANCE OF TAPE PLAYER)Head faulty.
Radio assembly faulty.
BE±100± BODY ELECTRICAL SYSTEMAUDIO SYSTEM

Functions OK if different cassette
tape installed?Radio assembly faulty.
Is tape player operating normally?Cassette tape jammed.
Is auto search button of radio
operating normally?Radio assembly faulty.
Check if RAD No.1 fuse is OK?Replace fuse.
Is +B applied to power amplifier?+B wire harness faulty.
Is +B applied to radio assembly?+B wire harness faulty
Power amplifier faulty.
Radio assembly faulty.
Cassette tape faulty. (Less than 3 secs. of silence between songs (APS, RPT),
Less than 15 secs. of silence (SKIP).)
APS, SKIP, RPT BUTTONS NOT OPERATINGTape Player
CASSETTE TAPE WILL NOT EJECTTape Player
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±101

Is CD already installed?Eject CD.
Is auto search button of radio operating
normally?
CD CANNOT BE INSERTEDCD Player
Is +B applied to CD player?
Replace fuse.
CD player faulty.
Check if GND (wire harness
side) to CD player is OK?
Radio assembly
faulty.
+ B wire harness faulty.
GND faulty.
Power amplifier faulty.
Check if RAD No.1 fuse is OK?
Is + B applied to power amplifier?
Check if GND (wire harness side) to power
amplifier is OK?
Is + B applied to radio assembly?
Radio assembly faulty.
Check if GND (wire harness side) to radio
|assembly is OK?
BE±102± BODY ELECTRICAL SYSTEMAUDIO SYSTEM

CD Player
Is radio operating normally?
CD INSERTS, BUT NO POWER
Check if RAD No.2 fuse is OK?
Is ACC applied to power amplifier?
Is ACC applied to radio assembly?
ACC wire harness faulty.
Replace fuse.
CD faulty.
Is ACC applied to CD player?Radio assembly
faulty.
Power amplifier faulty.
Radio assembly faulty.
CD Player
Is CD installed correct side up?
POWER COMING IN, BUT CD PLAYER NOT
OPERATING
Install correctly
Is radio operating normally?Is temperature inside cabin hot?
Functions OK if different CD installed?
Has sudden temperature change
occurred inside cabin?Formation of condensation
due to temp. change.
CD player faulty.
Speaker wire harness faulty.
Protective circuit in
operation.
Speaker faulty.
Power amplifier faulty. Recheck system after repair.
Is there continuity in speaker wire
harness?
Temporarily install another speaker.
Functions OK?
Hissing sound from speaker?
Radio assembly faulty. Recheck system after repair.
CD player faulty.
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±103

Does sound jump only during
strong vibration?Jumping caused by vibration.
Is CD player properly installed?Install properly.
Has sudden temperature change
occurred inside cabin?
Functions OK if different CD
installed?
Formation of condensation due to temp. change.
CD player faulty.
CD faulty.
CD faulty.
CD player faulty.
Speaker faulty.
Install properly.
Functions OK if different CD
installed?
Is radio operating normally?
Is speaker properly installed?
Temporarily install another speaker.
Functions OK?
Radio assembly or CD player or power amplifier faulty.
CD PlayerSOUND JUMPS
CD PlayerSOUND QUALITY POOR (VOLUME FAINT)
BE±104± BODY ELECTRICAL SYSTEMAUDIO SYSTEM

Is radio operating normally?CD player faulty.
Is hiss produced by non±functioning
speaker?Radio assembly faulty. Recheck system after repair.
Temporarily install another speaker.
Functions OK.
Is there continuity in speaker wire
harness?
Speaker faulty.
Power amplifier faulty. Recheck system after repair.
Speaker wire harness faulty.
Replace fuse
Radio receiver assembly faulty.
+B wire harness faulty.
GND faulty.
Check if RAD No. 1 fuse is OK?
Is radio operating normally?
Is +B applied to power amplifier
Check if GND to power amplifier is OK?
Is AMP applied to power amplifier?
CD PlayerEITHER SPEAKER DOES NOT WORK
CD PlayerWOOFER SPEAKER DOES NOT WORK
Check the radio receiver assembly.
Is there continuity in wire harness?
(Radio receiver to power amplifier)Wire harness faulty.
Woofer speaker faulty.Temporarily install another woofer speaker.
Functions OK?
Is there continuity in speaker wire harness?Speaker wire harness faulty.
Temporarily install another power amplifier.
Functions OK?Radio receiver assembly faulty.
Power amplifier faulty.
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±105

Is auto search button of radio
operating normally?
CD player faulty.
Check if DOME fuse is OK?
Radio assembly
faulty.
+ B wire harness faulty.
Radio assembly faulty.
Replace fuse.
CD PlayerCD WILL NOT EJECT
Is + B applied to CD player?
Power amplifier faulty.
Is + B applied to power amplifier?
Is + B applied to radio assembly?
BE±106± BODY ELECTRICAL SYSTEMAUDIO SYSTEM

Is ACC applied to power amplifier?Power amplifier.
Is there continuity in wire harness?
(Radio receiver to power amplifier)
Power amplifier faulty.
Wire harness faulty.
Radio receiver assembly faulty.
AmplifierNO POWER COMING IN
Is + B applied to power amplifier?
GND faulty.Check if GND to body is OK.
Is there continuity in speaker wire harness?
Speaker faulty.
Power amplifier faulty.
Power amplifier faulty.
Speaker wire harness faulty.
Radio receiver assembly faulty.
AmplifierPOWER COMING IN, BUT POWER AMPLIFIER
NOT OPERATING
Is power amplifier operating normally?
Temporarily install another speaker.
Functions OK?
Is hiss produced by non±functioning speaker?
Speaker faulty.
Power amplifier faulty.
Speaker wire harness faulty.
AmplifierEITHER SPEAKER DOES NOT WORK
Is power amplifier operating normally?
Temporarily install another speaker.
Functions OK?
Radio receiver assembly faulty.
Is there continuity in speaker wire harness?
± BODY ELECTRICAL SYSTEMAUDIO SYSTEMBE±107

Radio receiver assembly faulty.Is hiss produced by non±functioning speaker?
Speaker faulty.
Woofer amplifier faulty.
Speaker wire harness faulty.
AmplifierWOOFER SPEAKER DOES NOT WORK
Is power amplifier operating normally?
Temporarily install another speaker.
Functions OK?
Radio receiver assembly faulty.
Is there continuity in speaker wire harness?
Install properly.Is each system correctly installed?
Each system faulty.
NoiseNOISE PRODUCED BY VIBRATION OR SHOCK WHILE
DRIVING
Is speaker properly installed?
Noise produced by static electricity accumulating in the vehicle body.
With vehicle stopped, lightly tap each system.
Is noise produced?
Install properly.
BE±108± BODY ELECTRICAL SYSTEMAUDIO SYSTEM