1991 LEXUS SC400 Service Repair Manual

service schedule instrument cluster audio lock seat adjustment wheel

Page 601 of 4087

LEXUS SC400 1991 Service Repair Manual
2. INSTALL ANTENNA ROD
(a) Insert the cable of the rod until it reaches the bottom.HINT:
wWhen inserting the cable, the teeth on the cable must
face toward the rear of the vehicle.
w Insert the cab

2. INSTALL ANTENNA ROD
(a) Insert the cable of the rod until it reaches the bottom.HINT:
wWhen inserting the cable, the teeth on the cable must
face toward the rear of the vehicle.
w Insert the cable approx. 400 mm (15.75 in.).
(b) Wind the cable to retract the rod by turning the ignition switch
to ºLOCKº position.
HINT:
w If the ignition switch is already in ºLOCKº position,
perform step 1.
w In case the cable is not wound, twist it as shown in the
illustration.
w Even if the rod has not retracted fully, install the ant enna
nut and inspect the antenna rod operation. It will finally
retract fully.
(c) Inspect the antenna rod operation by pushing the radio wave
band select buttons.
MOTOR ANTENNA INSPECTION
1. INSPECT MOTOR ANTENNA (Circuit)
Disconnect the motor antenna connector from the body wire
harness and inspect the connector on body wire harness side
as shown.
Check for Tester connection\
\
Condition Specified value
Continuity 7±Ground\
\
Constant Continuity
Voltage 3±Ground\
\
Constant Battery positive voltage

g
8±Ground Ignition switch ACC or ON Battery positive voltage
8±Ground
g
position LOCK No voltage
6±Ground Ignition switch ON Battery positive voltage
6±Ground
g
position ACC or LOCK No voltage
2±Ground Ignition switch Radio or Tape or CD switch ON Battery positive voltage
2±Ground
g
ACC or ON Radio or Tape or CD switch OFF No voltage
5±Ground Ignition switch Radio switch ON Battery positive voltage
5±Ground
g
ACC or ON Radio switch OFF No voltage

4±Ground
Ignition switch
ACC or ON and
AM or FM (87.9 ± 96.0 MHz) Battery positive voltage
4±Ground ACC or ON and
radio switch ON Others No voltage

1±Ground

Ignition switch
ACC or ON and

AM

Battery positive voltage
radio switch ON Others No voltage
If circuit is not as specified, inspect radio or wire harness. If
circuit is as specified, replace motor antenna.
±
BODY ELECTRICAL SYSTEM AUDIO SYSTEMBE±215
WhereEverybodyKnowsYourName

Page 602 of 4087

LEXUS SC400 1991 Service Repair Manual
2. INSPECT ANTENNA MOTOR
(a) Install antenna nut.
(b) Disconnect connector from the motor antenna control relay.
(c) Connect the positive (+) lead from the battery to terminal 2and the negative

Page 603 of 4087

LEXUS SC400 1991 Service Repair Manual
ANTENNA CORD
ANTENNA CORD REMOVAL AND
INSTALLATION
1. REMOVE ANTENNA CORD
(a) Remove the following parts:wInstrument panel assembly
w Right front pillar garnish
w Roof headlining
w Roof side inner

Page 604 of 4087

$LEXUS SC400 1991 Service Repair Manual TROUBLESHOOTING NOTICE: When replacing the internal mechanism (ECU part) of the audio system,\ be careful that no part of your body or clothing comes in contact with the terminals of the lead\ s fro$

Page 605 of 4087

$LEXUS SC400 1991 Service Repair Manual \ \ Problem No. \ \ Radio not operating when power sw$

\
\

Problem No.
\
\
Radio not operating when power switch turned to ºONº 1

\

\

\

Display indicates when power switch turned to ºONº, but no sound (\
including ºnoiseº)
is produced (except woofer).

2
\
\
Noise present, but AM±FM not operating 3

Radio
\
\
Any speaker does not work (except woofer). 4
Radio\
\
Volume faint (except woofer). 5 \
\
Woofer does not work. 6

\

\

\
Woofer volume faint.

7
\
\
Reception poor. 8
\
\
Preset memory disappears. 9
\
\
Volume remains at maximum level. 10
\
\
Cassette tape cannot be inserted. 11
\
\
Cassette tape will not eject. 12
\
\
Display indicates, but no sound is produced (except woofer). 13 \
\
Any speaker does not work (except woofer). 14

Tape player
\

\

\
Volume faint (except woofer).

15
\
\
Woofer does not work. 16
\
\
Woofer volume faint. 17
\
\
Sound quality poor. 18
\
\
Volume remains at maximum level. 19
\
\
Magazine cannot be inserted into auto changer. 20
\
\
Magazine is inserted, but display does not indicate ºCDº. 21 \
\
Display indicates, but no sound is produced (except woofer). 22

\

\

\
Any speaker does not work (except woofer).

23
CDplayer\
\
Volume faint (except woofer). 24
CD player\
\
RH channel or LH channel speaker volume faint. 25
\
\
Woofer does not work. 26
\
\
Woofer volume faint. 27
\
\
Sound quality poor. 28
\
\
Volume remains at maximum level. 29
Noise
\
\
Noise produced by vibration or shock while driving. 30

Noise\

\

\
Noise produced when engine starts.

31
Antenna\
\
Antenna±related. 32
±
BODY ELECTRICAL SYSTEM AUDIO SYSTEMBE±219
WhereEverybodyKnowsYourName

Page 606 of 4087

LEXUS SC400 1991 Service Repair Manual
1RadioRADIO NOT OPERATING WHEN POWER
SWITCH TURNED TO ºONº.
A. Without CD player type
Does radio operate normally when AM or FM
button is pushed?
Check if RADIO NO.1 and RADIO NO.2 fuses
are OK.Is

Page 607 of 4087

LEXUS SC400 1991 Service Repair Manual
B. with CD player type
Does radio operate normally when AM or FM
button is pushed?
Is there battery positive voltage between the
following terminals with connector connected?
Radio receiver asse

Page 608 of 4087

LEXUS SC400 1991 Service Repair Manual
2Radio
DISPLAY INDICATES WHEN POWER SWITCH
TURNED TO ºONº, BUT NO SOUND (INCLUDING
ºNOISEº) IS PRODUCED (EXCEPT WOOFER)
A. without CD player type
Is there continuity between the following termina

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