Lexus GS300/400 (2000 year). Manual — part 56

BE0HD–04

I05186

”Bright”

”Dark”

1

2

3

4

Black coloured tape

I04048

Wire Harnes Side

BE–182

–

BODY ELECTRICAL

ELECTRO CHROMIC MIRROR SYSTEM

2483

INSPECTION

1.

INSPECT ELECTRO CHROMIC INNER MIRROR OP-
ERATION

(a)

Connect the positive (+) lead from the battery to terminal
1 and the negative (–) lead to terminal 4.

(b)

Connect the positive (+) lead from the voltmeter to termi-
nal 2 and the negative (–) lead to terminal 3.

(c)

Attach a black coloured tape to forward sensor to prevent
it from sensing.

(d)

When the mode is turned to AUTO, check that indicator
light lights up.

(e)

Light up the mirror with an electric light, and check that
there is battery positive voltage and mirror surface
changes ”bright” to ”dark”.

If operation is not as specified, replace the inner mirror.

2.

INSPECT ELECTRO CHROMIC INNER MIRROR CIR-
CUIT

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

Tester connection

Condition

Specified condition

4 – Ground

Constant

Continuity

1 – Ground

Ignition switch LOCK or ACC

No voltage

1 – Ground

Ignition switch ON

Battery positive voltage

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

I04178

”Bright”

”Dark”

w/o Memory

2

1

I04179

”Bright”

”Dark”

w/ Memory

5

4

–

BODY ELECTRICAL

ELECTRO CHROMIC MIRROR SYSTEM

BE–183

2484

3.

w/o Driving position memory:
INSPECT ELECTRO CHROMIC OUTER MIRROR OP-
ERATION

(a)

Disconnect the outer mirror connector.

(b)

Connect the positive (+) lead from the dry cell battery to
terminal 2 and the negative (–) lead to terminal 1, then
check that the mirror surface changes to ”dark”.

(c)

Check the mirror turns to ”bright” after disconnecting the
battery.

If operation is not as specified, replace the mirror assembly.
4.

w/ Driving position memory:
INSPECT ELECTRO CHROMIC OUTER MIRROR OP-
ERATION

(a)

Disconnect the outer mirror connector.

(b)

Connect the positive (+) lead from the dry cell battery to
terminal 5 and the negative (–) lead to terminal 4, then
check that the mirror surface changes to ”dark”.

(c)

Check the mirror turns to ”bright” after disconnecting the
battery.

If operation is not as specified, replace the mirror assembly.

BE0GH–10

I01370

Ignition Switch

Seat Heater Switch

Passenger Side Junction Block

SEAT–HTR Fuse

Seat Heater Cushion

Seat Heater Back

Seat Heater Cushion Inner

BE–184

–

BODY ELECTRICAL

SEAT HEATER SYSTEM

2485

SEAT HEATER SYSTEM

LOCATION

BE0GI–07

I04180

e–6–2–H

I04181

4

6

L

R Switch

L Switch

I04182

Seat back connector ”A”

Seat cushion
inner
connector ”B”

–

BODY ELECTRICAL

SEAT HEATER SYSTEM

BE–185

2486

INSPECTION

1.

INSPECT SEAT HEATER SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

Right side

3 – 4 – 6

Continuity

OFF

–

No continuity

Left side

2 – 4 – 6

Continuity

Illumination circuit

1 – 5

Continuity

If continuity is not as specified, replace the switch.

2.

INSPECT SEAT HEATER INDICATOR LIGHT OPERA-
TION

(a)

Connect the positive (+) lead from the battery to terminal
6 and the negative (–) lead to terminal 4.

(b)

Push the seat heater switch Right or Left side and check
that the indicator light lights up.

If operation is not as specified, replace the switch and inspect
the circuits connected to other parts.

3.

INSPECT SEAT HEATER CUSHION CONTINUITY

(a)

Heat the thermostat with a light.

(b)

Inspect the seat heater cushion continuity between termi-
nals, as shown.

Tester connection

Condition

Specified condition

A2 – B1

Constant

Continuity

A1 – A2

Seat heater temperature below 25

°

C (77

°

F)

Continuity

B1 – B2

Seat heater temperature above 45

°

C (113

°

F)

No continuity

If continuity is not as specified, replace the seat cushion pad.