Lexus GS300/400 (2000 year). Service manual — part 64
26
Noise
NOISE OCCURS
No
Yes
NG
OK
Does the noise occur only in the radio?
Does the noise occur in a particular place?
Is there any additional installation part
around the glass imprinted antenna?
(Sun shade film, telephone antenna etc.)
Does the noise occur even pulling out the
antenna cord from the radio?
Does the noise occur even after pulling out the
antenna terminal on the glass surface?
Isn’t there any adhesive (Butyl rubber)
stuck on the bases of the antenna
terminal, defogger terminal and bus bar?
Check the grounding of the antenna,
antenna cord, coke coil, and noise filter.
(See page
Does the noise occur even after pulling out
the defogger terminal?
Does the condition get better by replacing
the antenna cord.
Noise rediates directly to the antenna from the
generation source.
Does the condition get better by replacing
the choke coil?
Replace the antenna cord.
Replace the choke coil.
Interfering noise from the defogger line
and choke coil.
Grounding failure.
Failure of glass installation.
Must plane the butyl rubber.
Noise mixing into the antenna cable.
Check the radio.
Influence of the film or the noise radiation
of the additional installation part.
Does the noise stop by removing it?
An electric environment.
Refer to No.27.
(It occurs in the cassette and CD.)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
BE–214
–
BODY ELECTRICAL
AUDIO SYSTEM
2515
27
Noise
NOISE PRODUCED BY VIBRATION OR SHOCK WHILE DRIVING
No
Yes
Is speaker properly installed?
Noise is produced from static eletricity accumulating in the vehicle body.
With vehicles stationary lightly tap each system.
Is noise produced?
Install properly.
Each system faulty.
Is speaker properly installed?
No
No
Yes
Yes
28
Noise
NOISE PRODUCED WHEN ENGINE STARTS
No
Yes
Whistling noise which becomes high–pitched when
accelerator strongly depressed, disappears shortly
after engine stops.
Generator noise.
A/C noise.
Fuel gauge noise.
Horn noise.
Ignition noise.
Turn signal noise.
Washer noise.
Engine coolant temp. gauge noise.
Wiper noise.
Whining noise occurs when A/C is operating.
Scratching noise occurs during sudden acceleration, driving on rough
roads or when ignition switch is turned ON.
Clicking sound is heard when horn button is pressed, then
released. Whirring/grating sound is heard when pushed
continuously.
Murmuring sound stops when engine stops.
Tick–tack noise occurs in co–ordination with blinking
offlasher.
Noise occurs during window washer operation.
Scratching noise occurs while engine is running,
and continues a while even after engine stops.
Scraping noise in line with wiper beat.
Other type of noise
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
–
BODY ELECTRICAL
AUDIO SYSTEM
BE–215
2516
BE04S–04
I05031
–
BODY ELECTRICAL
POWER SOURCE
BE–21
2322
INSPECTION
1.
INSPECT ENGINE ROOM NO.1 JUNCTION BLOCK
CIRCUIT
(a)
Remove the fuse from the junction block and inspect the
connector on junction block side.
Fuse
Tester connection
Condition
Specified condition
MAIN
2 – Ground
Constant
Battery positive voltage
ABS NO.1
4 – Ground
Constant
Battery positive voltage
ALT
6 – Ground
Constant
Battery positive voltage
ABS
8 – Ground
Constant
Battery positive voltage
H–LP CLN
10 – Ground
Constant
Battery positive voltage
RAD NO.1
12 – Ground
Constant
Battery positive voltage
ALT–S
14 – Ground
Constant
Battery positive voltage
EFI
16 – Ground
Constant
Battery positive voltage
TURN HAZ
18 – Ground
Constant
Battery positive voltage
TEL
20 – Ground
Constant
Battery positive voltage
AM2
22 – Ground
Constant
Battery positive voltage
ETCS
24 – Ground
Constant
Battery positive voltage
HORN
26 – Ground
Constant
Battery positive voltage
MPX–B
27 – Ground
Constant
Battery positive voltage
BE–22
–
BODY ELECTRICAL
POWER SOURCE
2323
ECU–B1
30 – Ground
Constant
Battery positive voltage
HTR
31 – Ground
Constant
Battery positive voltage
FAN MAIN
33 – Ground
Constant
Battery positive voltage
CDS FAN
35 – Ground
Ignition switch ON
Battery positive voltage
RAD FAN
35 – Ground
Ignition switch ON
Battery positive voltage
H–LP R LWR
38 – Ground
Light control switch HEAD
Battery positive voltage
H–LP L LWR
38 – Ground
Light control switch HEAD
Battery positive voltage
H–LP R UPR
38 – Ground
Light control switch HEAD
Battery positive voltage
H–LP L UPR
42 – Ground
Light control switch HEAD
Battery positive voltage
If the circuit is not as specified, inspect the circuits connected
to other parts.
(b)
Remove the relay from the junction block and inspect the
connector on junction block side.
Relay
Tester connection
Condition
Specified condition
H–LP
44 – Ground
Constant
Battery positive voltage
H–LP
46 – Ground
Constant
Battery positive voltage
ST
48 – Ground
Constant
Continuity
ST
51 – Ground
Constant
Battery positive voltage
EFI MAIN
53 – Ground
Constant
Continuity
EFI MAIN
55 – Ground
Constant
Battery positive voltage
If the circuit is not as specified, inspect the circuits connected
to other parts.
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