Lexus SC300 / Lexus SC400. Manual — part 162

31

Noise

NOISE PRODUCED WHEN ENGINE STARTS

Whistling noise which becomes high–pitched when
accelerator strongly depressed, disappears shortly
after engine stops.

Whining noise occurs when A/C is operating.

Scratching noise occurs during sudden accel-
eration, driving on rough roads or when ignition
switch is turned on.

Clicking sound heard when horn button is
pressed, then released. Whirring/grating sound
when pushed continuously.

Murmuring sound, stops when engine stops.

Tick–tock noise, occurs in coordination with
blinking of flasher.

Noise occurs during window washer operation.

Scratching noise occurs while engine is running,
continues a while even after engine stops.

Scraping noise in time with wiper beat.

Other type of noise.

Alternator noise.

A/C noise.

Fuel gauge noise.

Horn noise.

Ignition noise.

Turn signal flasher noise.

Washer noise.

Water temp. gauge noise.

Wiper noise.

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BODY ELECTRICAL SYSTEM

AUDIO SYSTEM

BE–259

32

Antenna

ANTENNA–RELATED

Does antenna extend when radio switched ON?

Wire harness faulty.

Is there battery voltage between the following
terminals with connector disconnected?

Motor antenna control relay 6 – ground

Motor antenna control relay 14 – ground

Motor antenna control relay 3 – ground

Wire harness faulty.

Replace fuses.

Radio receiver assembly faulty.

Check if ECU–IG, RADIO No. 1 and RADIO No.
2 fuse are OK.

“AM” button turned ON.
Is there battery voltage between the following
terminals with connector connected?

Radio receiver assembly A9 (*A1) – ground

Radio receiver assembly A8 – ground

Radio receiver assembly D4 – ground

Radio receiver assembly D10 – ground

Radio receiver side
faulty.

Motor antenna faulty.

Temporarily install another motor antenna is
radio operating normally?

Glass printed antenna faulty.

Check if glass printed antenna is OK.

Is there continuity between the following terminals
with connector disconnected?

Motor antenna control relay 4 – ground

Continued on next page.

BE–260

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BODY ELECTRICAL SYSTEM

AUDIO SYSTEM

Wire harness faulty.

Is there continuity between the following terminals
with connector disconnected?

Radio receiver assembly A9 (*A1) – Motor anten-

na control relay 4

Radio receiver assembly A8 – Motor antenna

control relay 5

Radio receiver assembly D4 – Motor antenna

control relay 2

Radio receiver assembly D10 – Motor antenna

control relay 12

Temporarily install another motor antenna con-
trol relay. Functions OK?

Motor antenna control relay faulty.

Motor antenna control relay faulty.

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BODY ELECTRICAL SYSTEM

AUDIO SYSTEM

BE–261

HORN SYSTEM

PARTS LOCATION

WIRING AND CONNECTOR DIAGRAMS

BE–262

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BODY ELECTRICAL SYSTEM

HORN SYSTEM