Sound Quality Poor; Preset Memory Disappears - Lexus 2005 IS300 User Manual

BE-184
7 Radio
Is sound quality always bad?
Yes
Is tape player operating normally?
No
Is speaker properly installed?
Yes
Temporarily install another speaker. Functions OK?
No
Radio assembly or power amplifier faulty.
Recheck system after repair.
8 Radio
Can cassette tape be inserted in tape player?
No
Check if RADIO No.1 fuse is OK?
OK
Is power supplied to +B terminal of radio assembly?
Yes
Check if GND (wire harness side) of radio assembly
grounded normally?
OK
Radio assembly faulty.
2005 LEXUS IS300 (RM1140U)
BODY ELECTRICAL

SOUND QUALITY POOR

Is sound quality bad in certain
No
areas only?
Is tape player operating normally?
Radio assembly or power
amplifier faulty.
Yes

PRESET MEMORY DISAPPEARS

- AUDIO SYSTEM
Yes
No
Yes
No
No
Yes
Radio assembly faulty.
Yes
Replace fuse.
NG
+B wire harness faulty.
No
GND
NG
Author :
Poor signals, poor location.
Radio assembly faulty.
Radio assembly faulty.
Install properly.
Speaker faulty.
Date :
2188