Lexus LS400 (2000 year). Manual — part 8

I03437

OFF

ON

1

4

I03442

Wire Harness Side

I03481

3

6

BE–114

–

BODY ELECTRICAL

ELECTRIC TENSION REDUCER SYSTEM

1977

3.

INSPECT BUCKLE SWITCH CONTINUITY

(a)

Check that there is continuity between terminal 1 and 4
on the switch side connector with the switch ON (belt fas-
tened).

(b)

Check that there is no continuity between terminal 1 and
4 on the switch side connector with the switch OFF (belt
unfastened).

If operation is not as specified, replace the seat belt inner.

4.

INSPECT BUCKLE SWITCH CIRCUIT

Disconnect the connector from the switch and inspect the con-
nector on wire harness side, as shown.

Tester connection

Condition

Specified condition

4 – Ground

Constant

Continuity

1 – Ground

Ignition switch ON

Battery positive voltage

1 – Ground

Ignition switch ACC or LOCK

No voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.

5.

INSPECT BUCKLE SWITCH INDICATOR LIGHT OP-
ERATION

Connect the positive (+) lead from the battery to terminal 3 and
the negative (–) lead to terminal 6, and check that the indicator
light does not light up, replace the switch.

BE0C7–01

I03407

Engine Room Junction Block

MIR–HTR Fuse

Defogger Relay

A/C Control Panel Assembly

A/C Control Panel

A/C Amplifier

Instrument Panel
Junction Block

HEATER Fuse

Ignition Switch

RH Mirror

Mirror Defogger

LH Mirror

Mirror Defogger

Rear Window Glass

Window Defogger

–

BODY ELECTRICAL

DEFOGGER SYSTEM

BE–115

1978

DEFOGGER SYSTEM

LOCATION

BE0C8–03

I12823

Connector ”A”

Connector ”B”

22

1

6

2

I12824

ON

Connector ”A”

Connector ”B”

22

1

6

2

N13355

A/C Control Panel Side

N13356

A/C Control Panel Side

BE–116

–

BODY ELECTRICAL

DEFOGGER SYSTEM

1979

INSPECTION

1.

A/C control panel assembly:
INSPECT DEFOGGER SWITCH OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
A1,A2 and negative (–) lead to terminal A22.

(b)

Connect the positive (+) lead from the battery to terminal
B6 through a 1.4 W test bulb.

(c)

Turn the defogger switch ON and check that the test bulb
and indicator light turn ON, then turn OFF after about 15
minutes.

If operation is not as specified, proceed to the next inspection.

2.

A/C control panel:
INSPECT DEFOGGER SWITCH INDICATOR

(a)

Separate control panel and A/C amplifier.

(b)

Connect the positive (+) lead from the battery to terminal
100 and the negative (–) lead to terminal 116.

(c)

Push the switch and check that the indicator light lights
up.

If operation is not as specified, replace the bulb.

3.

INSPECT DEFOGGER SWITCH CONTINUITY

Condition

Tester connection

Specified condition

OFF

–

No continuity

ON

95 – 105

Continuity

If operation is as specified, replace the A/C amplifier.
If continuity is not as specified, replace the control panel.

N13357

Wire Harness Side

Z08903

Z08810

Tester Probe

Tin Foil

Heat Wire

–

BODY ELECTRICAL

DEFOGGER SYSTEM

BE–117

1980

4.

INSPECT DEFOGGER SWITCH CIRCUIT

Disconnect the connector from the switch and inspect the con-
nector on wire harness side, as shown.

Tester connection

Condition

Specified condition

11 – Ground

Constant

Continuity

2 – Ground

Ignition switch ON

Battery positive voltage

2 – Ground

Ignition switch ACC or LOCK

No voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.

5.

INSPECT DEFOGGER RELAY CONTINUITY

Condition

Tester connection

Specified condition

Constant

3 – 4

Continuity

Apply B+ between

terminals 3 and 4.

1 – 2

Continuity

If continuity is not as specified, replace the relay.

6.

INSPECT DEFOGGER WIRES

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
wires. Do not use detergents or glass cleaners with abra-
sive ingredients. When measuring voltage, wind a piece of
tin foil around the top of the negative probe and press the
foil against the wire with your fingers, as shown.