Lexus ES300 (1997 year). Service manual — part 139
V08553
24
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
BE–162
–
BODY ELECTRICAL
AUDIO SYSTEM
1546
1997 LEXUS ES300 (RM511U)
V08554
25
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 re-
leased. Whirring/grating sound is heard when pushed continu-
ously.
Murmuring sound stops when engine stops.
Tick–tack noise occurs in co–ordination with blinking of
flasher.
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–163
1547
1997 LEXUS ES300 (RM511U)
BE062–01
Z19355
Tweeter
Ignition Switch
Power Amplifier
Tweeter
Instrument Panel Junction Block
RADIO No.1 Fuse
RAD No.2 Fuse
Radio Receiver Assembly
Woofer
CD Auto Changer
Front Speaker
Rear Speaker
BE–164
–
BODY ELECTRICAL
AUDIO SYSTEM
1548
1997 LEXUS ES300 (RM511U)
LOCATION
BE063–01
N21369
Wire Harness Side
N21370
Wire Harness Side
Connector ”A”
Connector ”B”
Connector ”C”
–
BODY ELECTRICAL
AUDIO SYSTEM
BE–165
1549
1997 LEXUS ES300 (RM511U)
INSPECTION
1.
INSPECT CD AUTO CHANGER CIRCUIT
Disconnect connectors from CD auto changer and inspect the
connector on the wire harness side.
Tester connection
Condition
Specified condition
8 – Ground
Constant
Continuity
5 – Ground
Constant
Battery positive voltage
12 – Ground
Ignition switch LOCK
No voltage
12 – Ground
Ignition switch ACC or ON
Battery positive voltage
If the circuit is not as specified, inspect the circuits connected
to other parts.
HINT:
Check the wire harness between the radio receiver as-
sembly and the CD auto changer.
Since the signals to and from the MUTE, R
–
, R
+
, L
–
, L
+
,
TX
–
and TX
+
terminals are serial signals, they cannot or-
dinarily be measured with a tester.
2.
INSPECT POWER AMPLIFIER CIRCUIT
Disconnect the connector from power amplifier and inspect the
connector on the wire harness side.
Tester connection
Condition
Specified condition
C7 – Ground
Constant
Continuity
C3 – Ground
Ignition switch LOCK
No voltage
C3 – Ground
Ignition switch ACC or ON
Battery positive voltage
C4 – Ground
Constant
Battery positive voltage
If the circuit is not as specified, inspect the circuits connected
to other parts.
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