Lexus SC300 / Lexus SC400. Service manual - part 217

WIRING AND CONNECTOR DIAGRAMS
Turn Signal and Hazard Warning Lights

BE–66

–

BODY ELECTRICAL SYSTEM

Lighting System

Parts Replacement (Turn Signals)
(Cornering Light)

REPLACEMENT OF CORNARING LIGHT

1. 

REMOVE CORNARING LIGHT
(a)  Disconnect negative (–) terminal from the battery.
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ”LOCK” position and negative (–) terminal
cable is disconnected from the battery.
(b)  Remove front under cover. (See page 

BO–92

 )

(c)  Remove a screw and two nuts.
(d)  Remove cornaring light from bumper.
(e) Disconnect 

connector.

2. 

INSTALL CORNARING LIGHT
For installation follow the removal procedure in reverse.

(Front Turn Signal Light)

REPLACEMENT OF FRONT TURN
SIGNAL LIGHT

(See page 

BE–37

 )

HINT: Replacement of Headlight (LO–Beam)

(Rear Combination Light)

(See page

BE–56

 )

–

BODY ELECTRICAL SYSTEM

Lighting System

BE–67

Parts Inspection (Turn and Hazard)
(Combination Switch Assembly)

(See page 

BE–39

)

HINT:     Inspect turn signal light switch.

(Turn Signal Flasher)

REMOVAL AND INSTALLATION OF TURN
SIGNAL FLASHER

(See page 

BE–16

 )

INSPECTION OF TURN SIGNAL
FLASHER

INSPECT TURN SIGNAL FLASHER

(Operation)
LHD Side
(a) Connect 

the positive (+) lead from the battery to terminal

1 and the negative (–) lead to 4.

(b)  Connect the two turn signal light bulbs parallel to each

other to terminals 3 and 4, check that bulbs flash.

RHD Side
(c) Connect 

the positive (+) lead from the battery to terminal

1 and the negative (–) lead to 2.

(d) Connect 

two turn signal light bulbs parallel to each other

to terminals 2 and 5, check that the bulbs flash.

HINT: The turn signal lights should flash 60 to 120 times per
minute.
If one of the front or rear turn signal lights has an open circuit,
the number of flashes will be more than 140 per minute.
If operation is not as specified, replace the flasher.
(Flasher Circuit)
(See page 

BE–23

 )

(HAZARD WARNING SWITCH)

REMOVAL AND INSTALLATION OF
HAZARD WARNING SWITCH

1. REMOVE 

INSTRUMENT 

PANEL 

NO.2 

REGISTER

ASSEMBLY
(See page 

BO–111

 )

2. 

REMOVE HAZARD WARNING SWITCH
Remove two screws and hazard warning switch from register.

3. 

INSTALL HAZARD WARNING SWITCH AND REGISTER
For installation, follow the removal procedure in reverse.

BE–68

–

BODY ELECTRICAL SYSTEM

Lighting System

INSPECTION OF HAZARD WARNING
SWITCH

INSPECTION HAZARD WARNING SWITCH

(Continuity)
Inspect the switch continuity between terminals.

If continuity is not as specified, replace the switch.

(Switch Circuit)
Disconnect the switch connector and inspect the connection
on the wire harness side as shown.

Check for

Tester connection

Condition

Specified value

Voltage

8–Ground

Constant

Battery positive voltage

10–Ground

Ignition switch position

LOCK or ACC

No voltage

10–Ground

Ignition switch position

ON

Battery positive voltage

*

1

2–Ground

Light control switch position

OFF

No voltage

*

1

2–Ground

Light control switch position

TAIL or HEAD

Battery voltage

Continuity

*

1

3–Ground

Constant

Continuity

5–Ground

Constant

*

2

Continuity

6–Ground

Constant

*

2

Continuity

*1

: Illumination

*2

: There is resistance because this circuit is grounded through the bulb.

If the circuit is not as specified, refer to 

BE–66

  wiring diagram

and inspect the circuits connected to other parts.

–

BODY ELECTRICAL SYSTEM

Lighting System

BE–69