Lexus SC300 / Lexus SC400. Manual - part 221

(Luggage Compartment Door
Courtesy Switch)

REPLACEMENT OF LUGGAGE
COMPARTMENT DOOR COURTESY
SWITCH

1. 

REMOVE COURTESY SWITCH

(a)  Remove the opening trim.
(b)  Remove a bolt and disconnect connector.
(c)  Remove the switch.

2. 

INSTALL COURTESY SWITCH
For installation follow the removal procedure in reverse.

INSPECTION OF LUGGAGE COURTESY
SWITCH

INSPECT LUGGAGE DOOR COURTESY SWITCH

(Continuity)
Inspect the switch continuity between terminal and switch
body.

If operation is not as specified, replace the switch.
(Switch Circuit)
Disconnect the connector from the switch and inspect the
connector on the wire harness as shown.

Check for

Tester connection

Condition

Specified value

Voltage

1–Ground

Constant

Battery positive voltage

If circuit is not as specified, inspect power source or wire har-
ness.

BE–82

–

BODY ELECTRICAL SYSTEM

Lighting System

TROUBLESHOOTING 
Interior Light System

You will find the cause of trouble more easily using the table shown below. In this table, the numbers indicate
the order priority of the causes in the trouble. Check each part in the order shown. If necessary, replace the parts.

See page

B–4,21

BE–79

BE–49

BE–80

BE–81

BE–82

–

BE–6

Trouble

Part Name

DOME Fuse

Door Courtesy Switch

Integration Relay

Front Personal Light

V

anity Light

Luggage Compartment Door

Courtesy Switch

Wire Harness

Bulb

Only one interior light does not light up.

2

1

Interior light does not light up. (All)

1

2

”Illuminated Entry System” does not oper-
ate.

2

1

3

Interior light does not light up. 
(in front personal light)

2

3

1

Front personal light does not light up.

2

3

1

Rear personal light does not light up.

2

1

Vanity light does not light up.

2

3

1

Luggage compartment light does not light
up.

2

3

1

Courtesy light does not light up.

2

3

1

–

BODY ELECTRICAL SYSTEM

Lighting System

BE–83

WIPER AND WASHER SYSTEM

DESCRIPTION

The component parts of this system and their functions are described in the following table.

Parts Name

Function

Wiper Switch

This switch changes the current from the wiper motor in order to operate the wiper motor
at different speeds.
It also has a built–in variable resistor which is used to adjust the interval for intermittent
operation.

Wiper Relay

This relay turns the current to the wiper motor ON and OFF at intervals and operates the
wipers continuously when the washer switch is ON.

Wiper Motor

Switching of the current at the wiper switch and wiper relay operates the motor at each speed
(HI, LO) and at intervals (INT), thus moving the wiper arms and blades.

Washer Switch

By grounding current from the washer motor, this switch operates the washer motor.

Washer Motor

A pump in this motor pumps washer fluid and sprays it out from the washer nozzles.

Parts Location

BE–84

–

BODY ELECTRICAL SYSTEM

Wiper and Washer System

Parts Location (Cont’d)

–

BODY ELECTRICAL SYSTEM

Lighting System

BE–85