2000 LEXUS GS400 battery

BE0GT±03
I04112
6
I04113
I04114
Wire Harness Side
Connector ºAº Connector ºBº
I01200
2 1
35
2 5
1 3
BE±108
± BODY ELECTRICALDEFOGGER SYSTEM
2409 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT DEFOGGER TIMER OPERATION
(a) Connect the positive (+) lead from the voltmeter to termi-
nal 6 of body ECU No.1 connector and negative (±) lead
to body ground.
(b) When the switch is OFF, the voltage should be approx.
12V.
(c) Turn the defogger switch ON and check that the indicator
lights up and that the voltage is less than 1 V.
(d) After 15 minutes, check that the switch is OFF and the
voltage is approx. 12 V.
If operation is not as specified, replace the switch.
2. INSPECT DEFOGGER SWITCH (in PANEL SWITCH)
CIRCUIT
Connector disconnected:
Disconnect the connector from the panel switch and inspect the
connector on wire harness side, as shown in the chart.
Tester connectionConditionSpecified condition
B10 ± GroundConstantContinuity
A1 ± GroundConstantBattery voltage
A2 ± GroundIgnition switch LOCKNo voltage
A2 ± GroundIgnition switch ACC or ONBattery voltage
If the circuit is not as specified, replace the switch.
3. INSPECT DEFOGGER RELAY CONTINUITY
ConditionTester connectionSpecified condition
Constant1 ± 2Continuity
Apply B+ between
terminals 1 and 2.3 ± 5Continuity
If continuity is not as specified, replace the relay.
4. INSPECT DEFOGGER RELAY CIRCUIT
(See page DI±812 and BE±21)

I01200
2 1
35
2 5
1 3
I01291
Tester Probe
Tin FoilHeat Wire
I01292
At Center
I01293
0 Volts
Broken
WireSeveral
Volts
Battery
side Ground sideFoil strip


± BODY ELECTRICALDEFOGGER SYSTEM
BE±109
2410 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
5. INSPECT MIRROR DEFOGGER RELAY CONTINUITY
ConditionTester connectionSpecified condition
Constant1 ± 2Continuity
Apply B+ between
terminals 1 and 2.3 ± 5Continuity
If continuity is not as specified, replace the relay.
6. INSPECT MIRROR DEFOGGER RELAY CIRCUIT
(See page BE±21)
7. INSPECT DEFOGGER WIRE
NOTICE:

When cleaning the glass, use a soft, dry cloth, and wipe the
glass in the direction of the wire. Take care not to damage
the wires.

Do not use detergents or glass cleaners with abrasive in-
gredients.

When measuring voltage, wrap a piece of tin foil around the
tip of the negative probe and press the foil against the wire
with your finger, as shown.
(a) Turn the ignition switch ON.
(b) Turn the defogger switch ON.
(c) Inspect the voltage at the center of each heat wire, as
shown.
VoltageCriteria
Approx. 5VOkay (No break in wire)
Approx. 10V or 0VBroken wire
HINT:
If there is approximately 10 V, the wire is broken between the
center of the wire and the positive (+) end. If there is no voltage,
the wire is broken between the center of the wire and ground.
(d) Place the voltmeter positive (+) lead against the defogger
wire on the battery side.
(e) Place the voltmeter negative (±) lead with the foil strip
against the wire on the ground side.
(f) Slide the positive (+) lead from battery to ground side.
(g) The point where the voltmeter deflects from several V to
zero V is the place where the defogger wire is broken.
HINT:
If the heat wire is not broken, the voltmeter indicates 0 V at the
positive (+) end of the heat wire but gradually increases to about
12 V as the meter probe moves to the other end.

I01294
Repair Point
Broken
Wire
Marking Tape
I01295
I04115
78
I04269
12 13
BE±110
± BODY ELECTRICALDEFOGGER SYSTEM
2411 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
8. IF NECESSARY, REPAIR DEFOGGER WIRE
(a) Clean the broken wire tips with grease, wax and silicone
remover.
(b) Place the masking tape along both sides of the wire for
repair.
(c) Thoroughly mix the repair agent (Dupont paste No.
4817).
(d) Using a fine tip brush, apply a small amount of the agent
to the wire.
(e) After a few minutes, remove the masking tape.
(f) Do not repair the defogger wire for at least 24 hours.
9. w/ Mirror heater (w/o Driving position memory):
INSPECT MIRROR DEFOGGER OPERATION
(a) Connect the positive (+) lead from the battery to terminal
7 and the negative (±) lead to terminal 8.
(b) Check that the mirror becomes warm.
HINT:
It will take a short time for the mirror to become warm.
10. w/ Mirror heater (w/ Driving position memory):
INSPECT MIRROR DEFOGGER OPERATION
(a) Connect the positive (+) lead from the battery to terminal
12 and the negative (±) lead to terminal 13.
(b) Check that the mirror becomes warm.
HINT:
It will take a short time for the mirror to become warm.

Only specific window does not operate. (Neither manual nor automatic operation is available.)1
Diagnosis check:
Check output diagnosis trouble codes 21 ± 26 when operating the
master switch and power window switch.
(Refer to ºMultiplex Communication Systemº)If the door lock of the applicable seat operates.
Wire harness faulty or
D FR DOOR fuse faulty.
No Yes
Disconnect the driver door control ECU connector.
Ye sNo
Voltage check:
With ignition switch ON if 10 to 14 V power is
supplied to PCT (3) of power window switch.Wire harness faulty.
(Between master switch W/L2 terminal
(10) and power window switch PCT
terminal (3)
Continuity check:
Master switch faulty.
Check continuity master switch and power window switch.No (Driver side)
No (Except driver side)Ye s
No Ye s
Wire harness check:
Master switch
Master switch Driver door control ECU
AUTO (7)
DDN (18)
DUP (6)AUTO (B6)
MDN (B4)
MUP (B5)
Power window switch
Power window switch Driver door control ECU
A (5)
D (4)
U (6)AUTO (A22)
MDN (A23)
MUP (A24)
Wire harness faulty.
Continuity check:
Check continuity between UP terminal (A2) and
GND terminal (C12), DN terminal (A11) and
GND terminal (C12) of driver door control ECU .
Ye s
When replacing with the normal driver door control ECU
removed from another seat, if it operates normally.
Driver door control ECU faulty.No Yes
Driver door control ECU faulty.
No
Power window motor check:
Disconnect the motor connector.
Connect the battery positive (+) lead to terminal
UP (2) and negative (±) lead to terminal DN
(1) of wire harness side motor connector, check that
the motor operates.
Check power window motor.Ye s
No
Wire harness faulty.
Ye s
Power window motor faulty.
No
BE±112
± BODY ELECTRICALPOWER WINDOW CONTROL SYSTEM
2413 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
FLOW CHART

I04117
15 16
2
Unlock
I04118
15 16
2
Lock BE±118
± BODY ELECTRICALPOWER WINDOW CONTROL SYSTEM
2419 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
3. INSPECT POWER WINDOW MASTER SWITCH ILLU-
MINATION
(a) Set the window lock switch to the unlock position.
(b) Connect the positive (+) lead from the battery to terminal
15 and the negative (±) lead to terminal 16, and check that
all the illuminations light up.
(c) Connect the positive (+) lead from the voltmeter to termi-
nal 15 and negative (±) lead to terminal 2, and check that
the voltage meter needle indicates battery positive volt-
age.
(d) Set the window lock switch to the lock position, check that
all the passenger's power window switch illuminations go
out.
(e) Then, check that the voltage meter needle indicates no
voltage.
If operation is not as specified, replace the master switch.

I04075
Driver Side ECU
From Back Side
1 9
10 18
8
17
Wire Harness Side
I04183
Driver Side ECU
From Back Side 7
± BODY ELECTRICALPOWER WINDOW CONTROL SYSTEM
BE±119
2420 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
4. INSPECT ONE TOUCH POWER WINDOW SYSTEM/
CURRENT OF CIRCUIT (Using an ammeter)
(a) Disconnect the connector from the driver door ECU.
(b) Connect the positive (+) lead from the ammeter to termi-
nal 8 on the wire harness side connector and the negative
(±) lead to negative (±) terminal of the battery.
(c) Connect the positive (+) lead from the battery to terminal
17 on the wire harness side connector.
(d) As the window goes down, check that the current flow is
approximately 7 A.
(e) Check that the current increases up to approximately
14.5 A or more when the window stops going down.
HINT:
The PTC opens some 4 ± 90 seconds after the window stops
going down, so that check must be made before the PTC oper-
ates.
If the operation is as specified, replace the driver door ECU.
5. INSPECT ONE TOUCH POWER WINDOW SYSTEM/
CURRENT OF CIRCUIT (Using an ammeter with a cur-
rent±measuring probe)
(a) Remove the driver door ECU with connectors connected.
(b) Attach a current±measuring probe to terminal 7 of the
wire harness.
(c) Turn the ignition switch ON and set the power window
switch in the down position.
(d) As the window goes down, check that the current flow is
approximately 7 A.
(e) Check that the current increases up to approximately
14.5 A or more when the window stops going down.
HINT:
The PTC opens some 4 ± 90 seconds after the window stops
going down, so that check must be made before the PTC oper-
ates.
If operation is as specified, replace the driver door ECU.

I04123
I04119
2
3
I01200
2 1
35
2 5
1 3
I05474
1
2
BE±120
± BODY ELECTRICALPOWER WINDOW CONTROL SYSTEM
2421 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. INSPECT POWER WINDOW SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
AUTO3 ± 5Continuity
UP3 ± 6Continuity
OFF±No continuity
DOWN3 ± 4Continuity
If continuity is not as specified, replace the switch.
7. INSPECT POWER WINDOW SWITCH CIRCUIT
Passenger side: (See page DI±908)
Rear LH side: (See page DI±936)
Rear RH side: (See page DI±953)
8. INSPECT POWER WINDOW SWITCH ILLUMINATION
Connect the positive (+) lead from the battery to terminal 3 and
the negative (±) lead to terminal 2, and check that the indicator
light lights up.
If operation is not as specified, replace the switch.
9. INSPECT POWER MAIN RELAY CONTINUITY
ConditionTester connectionSpecified condition
Constant1 ± 2Continuity
Apply B+ between
terminals 1 and 2.3 ± 5Continuity
If continuity is not as specified, replace the relay.
10. INSPECT POWER MAIN RELAY CIRCUIT
(See page BE±21)
11. Driver 's door:
INSPECT POWER WINDOW MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (±) lead to terminal 2, and check that
the motor turns clockwise.

I054751
2
I05476
1
2
I054771
2
I04124
13
I04125
13
± BODY ELECTRICALPOWER WINDOW CONTROL SYSTEM
BE±121
2422 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Reverse the polarity, check that the motor turns counter-
clockwise.
If operation is not as specified, replace the motor.
12. Driver 's door:
INSPECT POWER WINDOW MOTOR CIRCUIT
(See page DI±876)
13. Front passenger's door:
INSPECT POWER WINDOW MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (±) lead to terminal 2, and check that
the motor turns clockwise.
(b) Reverse the polarity, check that the motor turns counter-
clockwise.
If operation is not as specified, replace the motor.
14. Front passenger's door:
INSPECT POWER WINDOW MOTOR CIRCUIT
(See page DI±910)
15. Rear left side door:
INSPECT POWER WINDOW MOTOR OPERATION
(a) Connect the positive (+) lead from the battery to terminal
3 and the negative (±) lead to terminal 1, and check that
the motor turns clockwise.
(b) Reverse the polarity, check that the motor turns counter-
clockwise.
If operation is not as specified, replace the motor.