Lexus GS300/400 (2000 year). Service manual — part 61
6
Radio
POOR RECEPTION
Is the condition bad in comparison with other vehicles?
Are there any additional installation parts?
(Sun shade film, telephone antenna, etc.)
Check if there is any scratch and breaking of a wire on
the glass antenna and the defogger pattern.
(visual check. tester)
Is the contact of the plug jack of the radio OK?
Does the condition get better by using the outer
antenna (such as pillar antenna)?
Is the contact of the antenna terminal on the glass
surface and the defogger terminal?
Is the continuity of the antenna cord OK?
Check the grounding of the antenna, antenna cord,
choke coil, and noise filter. (See page
)
Does the condition get better by replacing
the choke coil?
Does the condition get better by replacing the
antenna cord?
Take a measure for contact.
An electric wave environment is bad.
Does the condition get better if
removing them?
Influence of additional installation parts.
Repair. (See page
Check the radio.
Take a measure for contact.
Grounding failure.
Replace the antenna cord.
Replace the choke coil.
Replace the antenna cord.
Yes
No
Exchange the glass.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
NG
OK
Yes
BE–202
–
BODY ELECTRICAL
AUDIO SYSTEM
2503
7
Radio
SOUND QUALITY POOR
Yes
No
Yes
NG
OK
Is sound quality always bad?
Is tape player operating normally?
Poor signals, poor location.
Radio assembly faulty.
Install properly.
Speaker faulty.
Is tape player operating normally?
Is speaker properly installed?
Radio assembly or power amplifier faulty.
Recheck system after repair.
Temporarily install another speaker. Functions OK?
Is sound quality bad in certain
areas only?
Radio assembly or power
amplifier faulty.
Can cassette tape be inserted in tape player?
Check if RADIO No.1 fuse is OK?
Radio assembly faulty.
Replace fuse.
+B wire harness faulty.
GND faulty.
Power amplifier faulty.
8
Radio
PRESET MEMORY DISAPPEARS
No
Radio assembly faulty.
No
No
No
No
Yes
Yes
Yes
Power amplifier faulty.
Radio assembly faulty.
Yes
Yes
Yes
No
No
No
NG
NG
OK
OK
Yes
Check if GND (wire harness side) of power amplifier
grounded normally?
Is power supplied to +B terminal of power amplifier?
Check if GND (wire harness side) of radio assembly
grounded normally?
Is power supplied to +B terminal of radio assembly?
–
BODY ELECTRICAL
AUDIO SYSTEM
BE–203
2504
9
Tape Player
CASSETTE TAPE CANNOT BE INSERTED
Yes
No
NG
Is there a foreign object inside tape player?
Is auto search button radio operating normally?
Check if RADIO No.1 fuse is OK?
Radio assembly faulty.
Radio assembly faulty.
Remove foreign object.
Replace fuse.
+B wire harness faulty.
GND faulty.
Power amplifier faulty.
Power amplifier faulty.
Yes
No
No
OK
Yes
OK
Yes
OK
NG
No
NG
10
Tape Player
CASSETTE TAPE INSERTED, BUT NO POWER
Is radio operating normal?
Check if RAD No.2 fuse is OK?
ACC wire harness faulty.
Check if RADIO No.1 fuse is OK?
Radio assembly faulty.
Replace fuse.
Replace fuse.
+B wire harness faulty.
Power amplifier faulty.
Radio assembly faulty.
No
No
No
No
OK
OK
Yes
Yes
Yes
Yes
NG
NG
Check if GND (wire harness side) of power amplifier
grounded normally?
Is power supplied to +B terminal of power amplifier?
Check if GND (wire harness side) of radio assembly
grounded normally?
Is power supplied to +B terminal of radio assembly?
Is power supplied to +B terminal of radio assembly?
Is power supplied to ACC terminal of power amplifier?
Is power supplied to ACC terminal of radio assembly?
BE–204
–
BODY ELECTRICAL
AUDIO SYSTEM
2505
11
Tape Player
POWER COMING IN, BUT TAPE PLAYER NOT OPERATING
Yes
No
Radio assembly faulty.
Cassette tape faulty.
Speaker wire harness faulty.
Speaker faulty.
Power amplifier faulty.
Recheck system after repair.
Yes
No
No
Yes
Yes
No
No
Function OK if different cassette tape inserted?
Is radio operating normally?
Does continuity exist in speaker wire harness?
Temporarily install another speaker.
Function OK?
Hiss noise from speaker?
Radio assembly faulty.
Recheck system after repair.
Yes
Radio assembly faulty.
Recheck system after repair.
Radio assembly faulty.
No
No
No
Yes
Yes
Yes
Yes
No
Is radio operating normally?
Speaker wire harness faulty.
Speaker faulty.
Is hiss noise produced by non–functioning speaker.
Does continuity exist in speaker wire harness?
Temporarily install another speaker.
Function OK?
Radio assembly or power amplifier faulty.
12
Tape Player
ANY SPEAKER DOES NOT WORK
–
BODY ELECTRICAL
AUDIO SYSTEM
BE–205
2506
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