Lexus SC300 / Lexus SC400. Manual — part 157
B. with CD player type
Is radio operating normally?
Radio receiver assembly faulty.
Is there continuity between the following terminals
with connector disconnected?
Radio receiver amplifier B1 – Power switch 14
Radio receiver amplifier B3 – Power switch 11
When the volume switch is turned from minu-
mum to maximum, does resistance between
terminal B1–B3 of radio receiver assembly
change from 0 to 50 k
?
is resistance value about 50 k
between termi-
nals B3–B6 of radio receiver assembly?
Is there continuity between the following terminals
with connector disconnected?
Radio receiver amplifier B6 – Power switch 13
Power switch faulty.
Wire harness faulty.
Power switch faulty.
Wire harness faulty.
Is there continuity between the following terminals
with connector disconnected?
Radio receiver amplifier A1 – Power switch A6
Radio receiver as-
sembly faulty.
Wire harness faulty.
Wire harness faulty.
Power amplifier faulty.
Wire harness faulty.
Is there continuity between the following terminals
with connector disconnected?
Power amplifier A6 – ground
Is there battery voltage between the following ter-
minals with connector disconnected?
Power amplifier A14 – ground
Power amplifier B10 – ground
Is there continuity between the following terminals
with connector disconnected?
Power amplifier A7 – ground
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
BE–239
14
Tape player
ANY SPEAKER DOES NOT WORK (EXCEPT
WOOFER)
A. without CD player type
Is there continuity between the following terminals
with connector disconnected?
Fr:
Radio receiver assembly A1–FR speaker 1
Radio receiver assembly A5–FR speaker 2
FL:
Radio receiver assembly A2–FL speaker 1
Radio receiver assembly A6–FL speaker 2
RR:
Radio receiver assembly C1–RR speaker 1
Radio receiver assembly C3–RR speaker 2
RL:
Radio receiver assembly C2–RL speaker 1
Radio receiver assembly C6–RL speaker 2
Is there continuity between the following terminals
with connector disconnected?
FR:
Radio receiver assembly A1–ground
Radio receiver assembly A5–ground
FL:
Radio receiver assembly A2–ground
Radio receiver assembly A6–ground
RR:
Radio receiver assembly C1–ground
Radio receiver assembly C3–ground
RL:
Radio receiver assembly C2–ground
Radio receiver assembly C6–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 tape player operating normally?
Temporarily install another speaker.
Functions OK?
Radio receiver assembly faulty.
BE–240
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
B. with CD player type
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 tape player 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
amplifier A7
RL:
Radio receiver assembly A14–Power
amplifier 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
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
BE–241
Radio receiver assembly faulty.
Power amplifier faulty.
Temporarily install another power amplifier.
Function is OK?
BE–242
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
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