Page 241 of 1807
13 Tape Player SOUND QUALITY POOR (VOLUME FAINT)
Ye s
NoRadio assembly faulty. Cassette tape faulty.
Install properly.
Speaker faulty. Head dirty.
Ye s No
No
Ye sYe s
No No Function OK if different cassette tape inserted?
Is radio operating normally?
Is speaker properly installed?
Temporarily install another speaker.
Function OK?
Radio assembly faulty. Operates normally after cleaning the heads?
Ye s
Function OK if different tape (less than 120 mins.) is inserted?
Operates normally after cleaning the heads?
Radio assembly faulty. Is there a foreign object inside tape player?Cassette tape faulty.
Remove foreign object.
Head dirty. 14 TAPE JAMMED MALFUNCTION WITH TAPE SPEED OR AUTO-REVERSE
No
No
NoYe s
Ye s
Ye s 14
Tape PlayerTAPE JAMMED MALFUNCTION WITH TAPE SPEED OR AUTO-REVERSE
- BODY ELECTRICALAUDIO SYSTEM
BE-85
2063 Author: Date:
1997 SUPRA (RM502U)
Page 242 of 1807
15 Tape Player CASSETTE TAPE WILL NOT EJECTED
Radio assembly faulty. Is tape player operating normally?
Is auto search button of radio operating normally?
Check if RADIO No.1 fuse is OK?
Is -B applied to power amplifier?
Is +B applied to radio assembly?Cassette tape jammed.
Replace fuse.
+B wire harness faulty.
Power amplifier faulty. Ye s
Ye s
Ye sYe s
NoNo
No
No NG
OK
Radio assembly faulty.
16 CD Player CD CANNOT BE INSERTED
Ye s
No Is CD already inserted?
Eject CD.
Radio assembly faulty.Is +B applied to CD player?
Check if GND wire harness side
to CD player is OK?
CD player faulty.
Replace fuse.
+B wire harness faulty. Check if RADIO No.1 fuse is OK?
Is +B applied to power amplifier?
Check if GND (wire harness side) to radio assembly is OK?
Radio assembly faulty.
Is auto search button of radio operating normally?
NoNo Ye s
Ye sYe s
No OK
NG
OKOK
NGNG
BE-86
- BODY ELECTRICALAUDIO SYSTEM
2064 Author: Date:
1997 SUPRA (RM502U)
Page 243 of 1807

17 CD Player CD INSERTED, BUT NO POWER
Radio assembly faulty.
Replace fuse. Check if RADIO No.2 fuse is OK? Is radio operating normally?Is ACC applied to CD player?
CD player faulty.
ACC wire harness faulty. Is ACC applied to power amplifier?
Power amplifier faulty.
Radio assembly faulty. Is ACC applied to radio assembly?No
No
NoNo Ye s
Ye s
Ye s
Ye s OKNG
18 CD Player POWER COMING IN, BUT CD PLAYER NOT OPERATING
Is CD inserted with correct side up?
Is radio operating normally?Insert correctly.
CD faulty.
Protective circuit in
operation. Function OK if different CD inserted?
Has sudden temperature change
occurred inside cabin?
CD player faulty.Is temperature inside cabin hot?
Speaker wire harness faulty.
Speaker faulty.
Power amplifier faulty.
Recheck system after repair. Is there continuity in speaker wire harness?
Temporarily install another speaker.
Functions OK?
Hiss noise from speaker?
Radio assembly faulty.
Recheck system after repair.No
Ye s Ye s
Ye s
Ye s
Ye s
Ye s Ye s
Ye s No
No
NoNo
No
No
No
Formation of
condensation
due to temp. changes.
- BODY ELECTRICALAUDIO SYSTEM
BE-87
2065 Author: Date:
1997 SUPRA (RM502U)
Page 244 of 1807
CD Player SOUND JUMPS 19
CD player faulty. Does sound jump only during strong vibration?
Is CD player properly installed?
Functions OK if different CD inserted?
Has sudden temperature change occurred inside cabin?Jumping caused by vibration.
Install properly.
CD faulty.
Formation of condensation due to
temp. changes. Ye sYe s
Ye s
Ye s No No
No
No
20 CD Player SOUND QUALITY POOR (VOLUME FAINT)
Is radio operating normally?CD faulty. Function OK if different CD inserted?
Speaker faulty. Temporarily install another speaker.
Functions OK?Ye s
No
Is speaker property installed?CD player faulty.
Install properly. Ye s
Ye s Ye s No
NoNo
Radio assembly or CD player or power amplifier faulty. BE-88
- BODY ELECTRICALAUDIO SYSTEM
2066 Author: Date:
1997 SUPRA (RM502U)
Page 245 of 1807
CD player faulty.
Power amplifier faulty.
Recheck system after repair. Temporarily install another speaker.
Function OK?21 CD Player ANY SPEAKER DOES NOT WORK
Speaker wire harness faulty.
Speaker faulty. Is hiss noise produced by non-functioning speaker?
Is there continuity in speaker wire harness? Is radio operating normally?
Ye sYe s
Ye s
Ye s No
No
NoNoRadio assembly faulty.
Recheck system after repair.
CD player faulty. 22 CD Player CD WILL NOT BE EJECTED
Is auto search button of radio
operating normally?
NoIs +B applied to CD player?Radio assembly
faulty.
Replace fuse.
+B wire harness faulty.
Power amplifier faulty.
Radio assembly faulty. Is +B applied to radio assembly? Check if RADIO No.1 fuse is OK?
Is +B applied to power amplifier?No
No
No Ye s
NG
OK
Ye s
Ye sYe s
- BODY ELECTRICALAUDIO SYSTEM
BE-89
2067 Author: Date:
1997 SUPRA (RM502U)
Page 246 of 1807
23 Power Amplifier NO POWER COMING IN
+ B wire harness faulty.
GND faulty.
Power amplifier or wire harness faulty.
Power amplifier or wire harness faulty.
GND faulty.
Check if GND (wire harness side) to power amplifier is OK?
Is tape player operating normally?
Check if RAD-No.2 fuse is OK?
Is ACC applied to power amplifier?
Is + B applied to power amplifier?Ye s
NG
No OK No
No
No
No OK
OK
OK Ye s
Ye s
Ye s
Ye sNG
NG
NG Check if RAD-No.1 fuse is OK?
Is + B applied to radio assembly?
Radio assembly faulty.Replace fuse.
ACC wire harness faulty.
Is ACC applied to radio assembly?
Check if GND (wire harness side) to radio assembly is OK?
Radio assembly faulty.
Replace fuse.
BE-90
- BODY ELECTRICALAUDIO SYSTEM
2068 Author: Date:
1997 SUPRA (RM502U)
Page 247 of 1807

24 Power AmplifierPOWER COMING IN, BUT WOOFER (POWER) AMPLIFIER NOT
OPERATING
+ B wire harness faulty.
GND faulty.
Power amplifier faulty.
Speaker wire harness faulty. GND faulty.
Check if GND (wire harness side) to power amplifier is OK?
Is tape player operating normally?
Check if RAD-No.2 fuse is OK?
Is ACC applied to power amplifier?
Is + B applied to power amplifier?Ye s
NG
No OK No
No
No
No OK
OK
OK Ye s
Ye s
Ye s
Ye sNG
NG
NG Check if RAD-No.1 fuse is OK?
Is + B applied to radio assembly?
Radio assembly faulty. Recheck system after repair.Replace fuse.
ACC wire harness faulty.
Is ACC applied to radio assembly?
Check if GND (wire harness side) to radio assembly is OK?
Radio assembly faulty.
Replace fuse.
Is there continuity in speaker wire harness?
Temporarily install another speaker. Functions OK?
Hiss noise from speaker?Ye s
Ye s NoNo
No Ye sPower amplifier faulty.
Power amplifier faulty.
Recheck system after repair. Speaker faulty.
- BODY ELECTRICALAUDIO SYSTEM
BE-91
2069 Author: Date:
1997 SUPRA (RM502U)
Page 248 of 1807
CD player faulty.
Power amplifier faulty.
Recheck system after repair. Temporarily install another speaker.
Function OK?25 Power Amplifier ANY SPEAKER DOES NOT WORK
Speaker wire harness faulty.
Speaker faulty. Is hiss noise produced by non-functioning speaker?
Is there continuity in speaker wire harness? Is radio operating normally?
Ye sYe s
Ye s
Ye s No
No
NoNoRadio assembly faulty.
Recheck system after repair. BE-92
- BODY ELECTRICALAUDIO SYSTEM
2070 Author: Date:
1997 SUPRA (RM502U)