Lexus SC300 / Lexus SC400. Service manual — part 160
22
CD player
DISPLAY INDICATES, BUT NO SOUND IS
PRODUCED (EXCEPT WOOFER)
Is radio operating normally?
Wire harness faulty.
Is there battery voltage between the following ter-
minals with connector connected?
Power amplifier A14 – ground
Power amplifier A10 – ground
Wire harness faulty.
Is there battery voltage between the following ter-
minals with connector connected?
Power amplifier A6 – ground
Is there battery voltage between the following ter-
minals with connector connected?
Power amplifier A7 – ground
Is there battery voltage between the following ter-
minals with connector disconnected?
Radio receiver assembly B6 – Power switch 13.
Is there battery voltage between the following ter-
minals with connector disconnected?
Radio receiver assembly B1–Power switch 14
Radio receiver assembly B3–Power switch 11
Wire harness faulty.
Power switch faulty.
Wire harness faulty.
Radio receiver assem-
bly faulty.
Wire harness faulty.
Power switch faulty.
Is resistance value about 50 k
between terminals
B3–B6 of radio receiver assembly?
Temporarily install another CD auto changer.
Functions OK?
CD auto changer faulty.
Is there continuity between the following terminals
with connector disconnected?
Radio receiver assembly A1–Power amplifier A6.
When the volume switch is turned from minimum to
maximum, does resistance between terminals
B1–B3 of radio receiver assembly changer from 0
to 50 k
Radio receiver assembly faulty.
Radio receiver assembly faulty.
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
BE–251
23
CD player
ANY SPEAKER DOES NOT WORK
(EXCEPT WOOFER).
Is there continuity between the following terminals
with connector disconnected?
Fr:
Power amplifier B1–FR speaker 1
Power amplifier B5–FR speaker 2
FL:
Power amplifier B2–FL speaker 1
Power amplifier B6–FL speaker 2
RR:
Power amplifier B3–RR speaker 1
Power amplifier B4–RR speaker 2
RL:
Power amplifier B8–RL speaker 1
Power amplifier B9–RL speaker 2
Is there continuity between the following terminals
with connector disconnected?
FR:
Power amplifier B1–ground
Power amplifier B5–ground
FL:
Power amplifier B2–ground
Power amplifier B6–ground
RR:
Power amplifier B3–ground
Power amplifier B4–ground
RL:
Power amplifier B8–ground
Power amplifier B9–ground
Wire harness faulty
(The wire harness for the FR speaker passes
through the transceiver, so the transceiver side
should be checked)
Wire harness faulty
(The wire harness for the FR speaker passes
through the transceiver, so the transceiver side
should be checked)
Speaker faulty.
Radio receiver assembly faulty.
Is radio operating normally?
Temporarily install another speaker.
Functions OK?
Wire harness faulty.
Wire harness faulty.
Is there continuity between the following terminals
with connector disconnected?
FR:
Radio receiver assembly A7–Power amplifier
A1
FL:
Radio receiver assembly A6–Power amplifier
A2
RR:
Radio receiver assembly A15–Power amplifi-
er A7
RL:
Radio receiver assembly A14–Power amplifi-
er A8
Is there continuity between the following terminals
with connector disconnected?
FR:
Radio receiver assembly A7–ground
FL:
Radio receiver assembly A6–ground
RR:
Radio receiver assembly A15–ground
RL:
Radio receiver assembly A14–ground
BE–252
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
Temporarily install another power amplifier.
Function is OK?
Radio receiver assembly faulty.
Power amplifier faulty.
24
CD player
VOLUME FAINT (EXCEPT WOOFER)
Is radio operating normally?
When the volume switch is turned from minimum to
maximum, does resistance between terminals
B1–B3 of radio receiver assembly changer from 0
to 50 k
Radio receiver assembly faulty.
Power switch faulty.
Wire harness faulty.
Power amplifier faulty.
Radio receiver assembly faulty.
*Is there battery voltage between the following
terminals with connector disconnected?
Radio receiver assembly D3 – ground
Temporarily install another power amplifier.
Function is OK?
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
BE–253
25
CD player
RH CHANNEL OR LH CHANNEL SPEAKER
VOLUME FAINT
Is there continuity between the following terminals
with connector disconnected?
RH:
:Radio receiver assembly C1 –
CD auto changer A1
:Radio receiver assembly C6 –
CD auto changer A5
LH:
Radio receiver assembly C2 –
CD auto changer A2
:Radio receiver assembly C7 –
CD auto changer A6
Radio receiver as-
sembly faulty.
Is radio operating normally?
Wire harness faulty.
Wire harness faulty.
Is there continuity between the following terminals
with connector disconnected?
RH:
:Radio receiver assembly C1 – ground
:Radio receiver assembly C6 – ground
LH:
:Radio receiver assembly C2 – ground
:Radio receiver assembly C7 – ground
Temporarily install another CD auto changer.
Functions OK?
CD auto changer faulty.
Radio receiver assembly faulty.
Power amplifier
faulty.
Temporarily install another power amplifier.
Functions OK.
BE–254
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
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