Lexus RX300 (MCU15). Service manual — part 147

I07323

LH
Side

RH
Side

4

5

I07324

LH
Side

RH
Side

5

6

I07325

LH
Side

RH
Side

5

6

–

BODY ELECTRICAL

POWER MIRROR CONTROL SYSTEM

BE–135

LEXUS RX300 (RM785E)

(b)

Reverse the polarity, check that the mirror turns to right
side.

(c)

Connect the positive (+) lead from the battery to terminal
5 and the negative (–) lead to terminal 6, check that the
mirror turns upward.

(d)

Reverse the polarity, check that the mirror turns down
ward.

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

BE0HC–08

I19139

Ignition Switch

Instrument Panel J/B
D ECU–IG

Electro Chromic Outer
Mirror

Electro Chromic Inner Mirror

BE–136

–

BODY ELECTRICAL

ELECTRO CHROMIC MIRROR SYSTEM

LEXUS RX300 (RM785E)

ELECTRO CHROMIC MIRROR SYSTEM

LOCATION

BE0UN–02

I05186

”Bright”

”Dark”

1

2

3

4

Black coloured tape

I04048

Wire Harnes Side

–

BODY ELECTRICAL

ELECTRO CHROMIC MIRROR SYSTEM

BE–137

LEXUS RX300 (RM785E)

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.

I07326

”Bright”

”Dark”

2

1

BE–138

–

BODY ELECTRICAL

ELECTRO CHROMIC MIRROR SYSTEM

LEXUS RX300 (RM785E)

3.

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.