Lexus GS300/400 (2000 year). Service manual - part 39

 

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Lexus GS300/400 (2000 year). Service manual - part 39

 

 

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 ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–119

2420

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

3

5

2

5

1

3

I05474

1

2

BE–120

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

2421

6.

INSPECT POWER WINDOW SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

AUTO

3 – 5

Continuity

UP

3 – 6

Continuity

OFF

–

No continuity

DOWN

3 – 4

Continuity

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

Condition

Tester connection

Specified condition

Constant

1 – 2

Continuity

Apply B+ between

terminals 1 and 2.

3 – 5

Continuity

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.

I05475

1

2

I05476

1

2

I05477

1

2

I04124

1

3

I04125

1

3

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

BE–121

2422

(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.

I04126

1

3

I04127

1

3

I04128

within
4 to 40 seconds

2

1

I04129

2

within
60 seconds

1

I04130

within
4 to 40 seconds

3

1

BE–122

–

BODY ELECTRICAL

POWER WINDOW CONTROL SYSTEM

2423

16.

Rear right side door:
INSPECT POWER WINDOW MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
1 and the negative (–) lead to terminal 3, 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.

17.

Front door:
INSPECT POWER WINDOW MOTOR PTC OPERA-
TION

(a)

Disconnect the connector from the master switch.

(b)

Connect the positive (+) lead from the battery to terminal
2 and the negative (–) lead to terminal 1 on the wire har-
ness side connector and raise the window to full closed
position.

(c)

Continue to apply voltage, check that there is a PTC op-
eration noise within approximately 4 to 90 seconds.

(d)

Reverse the polarity, check that the window begins to de-
scend within approximately 60 seconds.

If operation is not as specified, replace the motor.

18.

Rear door:
INSPECT POWER WINDOW MOTOR PTC OPERA-
TION

(a)

Disconnect the connector from the rear door ECU.

(b)

Connect the positive (+) lead from the battery to terminal
3 and the negative (–) lead to terminal 1 on the wire har-
ness side connector, and raise the window to full closed
position.

(c)

Continue to apply voltage, check that there is a PTC op-
eration noise within approximately 4 to 90 seconds.

 

 

 

 

 

 

 

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