2000 LEXUS GS400 fuse

9 Tape Player CASSETTE TAPE CANNOT BE INSERTED
Ye s
No NG Is there a foreign object inside tape player?
Is auto search button radio operating normally?
Check if RADIO No.1 fuse is OK?
Radio assembly faulty.Radio assembly faulty. Remove foreign object.
Replace fuse.
+B wire harness faulty.
GND faulty.
Power amplifier faulty.
Power amplifier faulty. Ye s No
No
OK
Ye s
OK
Ye s
OKNG
No
NG
10 Tape Player CASSETTE TAPE INSERTED, BUT NO POWER
Is radio operating normal?
Check if RAD No.2 fuse is OK?
ACC wire harness faulty.
Check if RADIO No.1 fuse is OK?Radio assembly faulty.
Replace fuse.
Replace fuse.
+B wire harness faulty.
Power amplifier faulty.
Radio assembly faulty.No
No
No
No OK
OKYe s
Ye s
Ye sYe s
NG
NG Check if GND (wire harness side) of power amplifier
grounded normally? Is power supplied to +B terminal of power amplifier?
Check if GND (wire harness side) of radio assembly
grounded normally? Is power supplied to +B terminal of radio assembly?
Is power supplied to +B terminal of radio assembly? Is power supplied to ACC terminal of power amplifier?
Is power supplied to ACC terminal of radio assembly? BE±204
± BODY ELECTRICALAUDIO SYSTEM
2505 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

15 Tape Player CASSETTE TAPE WILL NOT BE EJECTED
Radio assembly faulty. Is tape player operating normally?
Is auto search button of radio operating normally?
Check if RADIO No.1 fuse is OK?Cassette tape jammed.
Replace fuse.
+B wire harness faulty.
Power amplifier faulty. Ye s
Ye s
Ye sYe s
NoNo
No
No NG
OK
Radio assembly faulty.
16 CD Player CD CANNOT BE INSERTED
Ye s
No Is CD already inserted?
Eject CD.
Radio assembly faulty.
CD player faulty.
Replace fuse.
+B wire harness faulty. Check if RADIO No.1 fuse is OK?
Radio assembly faulty.
Is auto search button of radio operating normally?
NoNo Ye s
Ye sYe s
No OK
NG
OKOK
NGNG
Check if GND (wire harness side) of radio assembly
grounded normally? Is power supplied to +B terminal of power amplifier?
Is power supplied to +B terminal of radio receiver?
Is power supplied to +B terminal of power amplifier?Is power supplied to +B terminal
of CD player?
Check if GND (wire harness
side) of CD player grounded
normally?
± BODY ELECTRICALAUDIO SYSTEM
BE±207
2508 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

17 CD Player CD INSERTED, BUT NO POWER
Radio assembly faulty.
Replace fuse. Check if RADIO No.2 fuse is OK? Is radio operating normally?
CD player faulty.
ACC wire harness faulty.
Power amplifier faulty.
Radio assembly faulty.No
No
NoNo Ye s
Ye s
Ye s
Ye s OKNG
18 CD Player POWER COMING IN, BUT CD PLAYER NOT OPERATING
Is CD inserted with correct side up?
Is radio operating normally?Insert correctly.
CD faulty.
Protective circuit in
operation. Function OK if different CD inserted?
Has sudden temperature change
occurred inside cabin?
CD player faulty.Is temperature inside cabin hot?
Speaker wire harness faulty.
Speaker faulty.
Power amplifier faulty.
Recheck system after repair. Dose continuity exist in speaker wire harness?
Temporarily install another speaker.
Functions OK?
Hiss noise from speaker?
Radio assembly faulty.
Recheck system after repair.No
Ye s Ye s
Ye s
Ye s
Ye s
Ye s Ye s
Ye s No
No
NoNo
No
No
No
Formation of
condensation
due to temp. changes.
Is power supplied to ACC terminal of power amplifier?
Is power supplied to ACC terminal of radio assembly?Is power supplied to ACC
terminal of CD player? BE±208
± BODY ELECTRICALAUDIO SYSTEM
2509 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

CD player faulty.
Power amplifier faulty.
Recheck system after repair. Temporarily install another speaker.
Function OK?21 CD Player ANY SPEAKER DOES NOT WORK
Speaker wire harness faulty.
Speaker faulty. Is hiss noise produced by non±functioning speaker?
Does continuity exist in speaker wire harness? Is radio operating normally?
Ye sYe s
Ye s
Ye s No
No
NoNoRadio assembly faulty.
Recheck system after repair.
CD player faulty. 22 CD Player CD WILL NOT BE EJECTED
Is auto search button of radio
operating normally?
NoRadio assembly
faulty.
Replace fuse.
+B wire harness faulty.
Power amplifier faulty.
Radio assembly faulty. Check if RADIO No.1 fuse is OK?No
No
No Ye s
NG
OK
Ye s
Ye sYe s
Is power supplied to +B terminal of power amplifier?
Is power supplied to +B terminal of radio receiver?Is power supplied to +B terminal
of CD player? BE±210
± BODY ELECTRICALAUDIO SYSTEM
2511 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

23 Power Amplifier NO POWER COMING IN
+ B wire harness faulty.
GND faulty.
Power amplifier or wire harness faulty.
Power amplifier or wire harness faulty.
GND faulty. Is tape player operating normally?
Check if RAD±No.2 fuse is OK?Ye s
NG
No OK No
No
No
No OK
OK
OK Ye s
Ye s
Ye s
Ye sNG
NG
NG Check if RAD±No.1 fuse is OK?
Radio assembly faulty.Replace fuse.
ACC wire harness faulty. Radio assembly faulty.
Replace fuse.
Check if GND (wire harness side) of power amplifier
grounded normally?Is power supplied to ACC terminal of power amplifier?
Is power supplied to +B terminal of power amplifier?
Is power supplied to ACC terminal of radio assembly?
Is power supplied to +B terminal of radio assembly?
Check if GND (wire harness side) of radio assembly
grounded normally?
± BODY ELECTRICALAUDIO SYSTEM
BE±211
2512 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

24 Power AmplifierPOWER COMIMG IN, BUT WOOFER (POWER) AMPLIFIER NOT
OPERATING
+ B wire harness faulty.
GND faulty.
Power amplifier faulty.
Speaker wire harness faulty. GND faulty. Is tape player operating normally?
Check if RAD±No.2 fuse is OK?Ye s
NG
No OK No
No
No
No OK
OK
OK Ye s
Ye s
Ye s
Ye sNG
NG
NG Check if RAD±No.1 fuse is OK?
Radio assembly faulty. Recheck system after repair.Replace fuse.
ACC wire harness faulty. Radio assembly faulty.
Replace fuse.
Is there continuity in speaker wire harness?
Temporarily install another speaker. Functions OK?
Hiss noise from speaker?Ye s
Ye s NoNo
No Ye sPower amplifier faulty.
Power amplifier faulty.
Recheck system after repair. Speaker faulty.
Is power supplied to ACC terminal of power amplifier?
Check if GND (wire harness side) of power amplifier
grounded normally? Is power supplied to +B terminal of power amplifier?
Is power supplied to ACC terminal of radio assembly?
Is power supplied to +B terminal of radio assembly?
Check if GND (wire harness side) of radio assembly
grounded normally? BE±212
± BODY ELECTRICALAUDIO SYSTEM
2513 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

BE04S±04
I05031
± BODY ELECTRICALPOWER SOURCE
BE±21
2322 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT ENGINE ROOM NO.1 JUNCTION BLOCK
CIRCUIT
(a) Remove the fuse from the junction block and inspect the
connector on junction block side.
Fuse Tester connectionConditionSpecified condition
MAIN 2 ± GroundConstantBattery positive voltage
ABS NO.1 4 ± GroundConstantBattery positive voltage
ALT 6 ± GroundConstantBattery positive voltage
ABS 8 ± GroundConstantBattery positive voltage
H±LP CLN 10 ± GroundConstantBattery positive voltage
RAD NO.1 12 ± GroundConstantBattery positive voltage
ALT±S 14 ± GroundConstantBattery positive voltage
EFI 16 ± GroundConstantBattery positive voltage
TURN HAZ 18 ± GroundConstantBattery positive voltage
TEL 20 ± GroundConstantBattery positive voltage
AM2 22 ± GroundConstantBattery positive voltage
ETCS 24 ± GroundConstantBattery positive voltage
HORN 26 ± GroundConstantBattery positive voltage
MPX±B 27 ± GroundConstantBattery positive voltage

I05032
± BODY ELECTRICALPOWER SOURCE
BE±23
2324 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
2. INSPECT ENGINE ROOM No.3 RELAY BLOCK CIR-
CUIT
Remove the relay from the relay block and inspect the connec-
tor on relay block side.
Fuse Tester connectionConditionSpecified condition
FAN NO.1 3 ± GroundIgnition switch ONBattery positive voltage
FAN NO.2 8 ± GroundIgnition switch ONBattery positive voltage
A/C COMP 13 ± GroundIgnition switch ONBattery positive voltage
FAN NO.3 17 ± GroundIgnition switch ONBattery positive voltage
DIMMER 20 ± GroundConstantBattery positive voltage
If the circuit is not as specified, inspect the circuits connected
to other parts.