Lexus SC300 / Lexus SC400. Manual — part 143

POWER MIRROR CONTROL
SYSTEM

Description

The Power Miror Control System carries out mirror left/right and up/down adjustments electrically when the Mir-
ror Switch is operated. In addition, operation of the Driving Position Memory and Return Switches makes it pos-
sible to store the adjusted position in memory and reproduce each adjustment when desired. The component
parts of this system and their functions are described in the following table.

Parts Name

Function

Outside Rear View
Mirror ECU

The Outside Rear View Mirror ECU is supplied with power from the DOME and RADIO
NO.2 fuses and is connected to the Tilt and Telescopic ECU, Mirror Switch, each
mirror motor and ground.

Rear View Adjustment
Switch

Operation of this switch sends left/right, up/down signals to Outside Rear View Mirror
ECU.

Driving Position Memory
and Return Switches

Memory and return signals are sent to the ECU via the Tilt and Telescopic ECU.

Mirror Motor

These motors operate on current from the Outside Rear View Mirror ECU, moving
the various parts of the mirror directly.
These sensors send signals about the motor positions to the ECU for storing in memory
and during return operation.

Left/Right Select Switch

This switch is used to select operation of the Rear View Adjustment Switch for the
leftor right hand side mirror.

–

BODY ELECTRICAL SYSTEM

Power Mirror Control System

BE–183

Parts Location

BE–184

–

BODY ELECTRICAL SYSTEM

Power Mirror Control System

Wiring and Connector Diagrams (Cont’d)

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BODY ELECTRICAL SYSTEM

Power Mirror Control System

BE–185

Parts Inspection
(Mirror Switch)
REMOVAL AND INSTALLATION OF
MIRROR SWITCH

(See Instrument Panel on page

BO–33

)

INSPECTION OF MIRROR SWITCH

INSPECT SWITCH CONTINUITY

Rear View adjustment switch

Left/Right Select

Switch Position

Terminal

Switch Position

OFF

UP

DOWN

LEFT

RIGHT

LEFT SIDE

RIGHT SIDE

Left/Right select switch

If continuity is not as specified, replace the switch.

(Mirror Motor)
REMOVAL AND INSTALLATION OF
OUTSIDE MIRROR ASSEMBLY

(See Outside Rear View Mirror on page

BO–42

)

INSPECTION OF MIRROR MOTOR

1.

INSPECT MIRROR MOTOR OPERATION
(a) Connect

the positive (+) lead from the battery to terminal

1 and negative (–) lead to terminal 2 check that the
mirror turns to left side.

(b) Reverse the polarity, check that the mirror turns to right

side.

(c) Connect

the positive (+) lead from the battery to terminal

3 and negative (–) lead to terminal 2 check that the
mirror turns upward.

(d) Reverse the polarity, check that the mirror turns

downward.

BE–186

–

BODY ELECTRICAL SYSTEM

Power Mirror Control System

Terminal

Switch Position

OFF

LEFT

RIGHT