Lexus ES300 (1997 year). Service manual - part 240

BE–24

–

BODY ELECTRICAL

IGNITION SWITCH AND KEY UNLOCK WARNING 
SWITCH

1408

1997 LEXUS ES300   (RM511U)

Tester connection

Condition

Specified  condition

A19 – Ground

Driver’s door key lock and unlock switch OFF or

LOCK

No continuity

A19 – Ground

Driver’s door key lock and unlock switch

UNLOCK

Continuity

A20 – Ground

Passenger’s door key lock and unlock switch

OFF or LOCK

No continuity

A20 – Ground

Passenger’s door key lock and unlock switch

UNLOCK

Continuity

A1 – Ground

Constant

Battery positive voltage

B1 – Ground

Light control switch OFF

No voltage

B1 – Ground

Light control switch TAIL or HEAD

Battery positive voltage

B4 – Ground

Light control switch OFF or TAIL

No voltage

B4 – Ground

Light control switch HEAD

Battery positive voltage

B2 – Ground

B3 – Ground

Constant

Battery positive voltage

If the circuit is as specified, try replacing the relay with a new
one.
If the circuit is not as specified, inspect the circuits connected
to other parts.

Z19392

Headlights

Automatic Light
Control Sensor

E/G Room Junction Block

 HEAD (RH) Fuse

 HEAD (LH) Fuse

 HEAD (RH–LH) Fuse

 DOME Fuse

 HEAD (LH–LO) Fuse

 ECU–B Fuse

 Headllight Control Relay

CANADA:
E/G Room R/B No.2

 HEAD (RH–LWR) fuse

 HEAD (LH–LWR) fuse

 D.R.L No.2 Fuse

 D.R.L No.2 Relay

 D.R.L No.3 Relay

 D.R.L No.4 Relay

USA

CANADA

Combination Switch

 Light Control Switch

 Headlight Dimmer Switch

Ignition Switch

D.R.L.(MAIN) Relay

Taillight

D.R.L.:Daytime Running Light

Door Courtesy Switch

Instrument Panel
Junction Block

 GAUGE Fuse

 TAIL Fuse

 Taillight Control Relay

 Integration Relay

BE04W–01

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

BE–25

1409

1997 LEXUS ES300   (RM511U)

HEADLIGHT AND TAILLIGHT SYSTEM

LOCATION

BE04X–01

N21561

Steering Position Sensor

Combination Switch

 Light Control Switch

 Headlight Dimmer Switch

Switch Body

Steering Position Disc

 Wiper and Washer Switch

Combination Switch

Spiral Cable

BE–26

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

1410

1997 LEXUS ES300   (RM511U)

COMPONENTS

BE04Y–02

N21562

Hi beam

AUTO

HEAD

TAIL

OFF

Flash

7

8

17

16

14 13

12

N21563

Wire Harness Side

2

1

3 4 5

6

7 8

13 14 15 16

9 10 11 12

17

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

BE–27

1411

1997 LEXUS ES300   (RM511U)

INSPECTION

1.

INSPECT LIGHT CONTROL SWITCH CONTINUITY

Switch position

Tester connection

Specified  condition

OFF

–

No continuity

TAIL

14 – 16

Continuity

HEAD

13 – 14 – 16

Continuity

AUTO

12 – 16

Continuity

If continuity is not as specified, replace the switch.
2.

INSPECT HEADLIGHT DIMMER SWITCH CONTINU-
ITY

Switch position

Tester connection

Specified  condition

Low beam

16 – 17

Continuity

High beam

7 – 16

Continuity

Flash

7 – 8 – 16

Continuity

If continuity is not as specified, replace the switch.

3.

INSPECT COMBINATION SWITCH CIRCUIT

Connect the wire harness side connector to the combination
switch and inspect wire harness side connector from the back
side.

Light Control Switch:

Tester connection

Condition

Specified  condition

16 – Ground

Constant

Continuity

12 – Ground

Light control switch OFF, TAIL or HEAD

No voltage

12 – Ground

Light control switch AUTO

Battery positive voltage

13 – Ground

Light control switch OFF or TAIL

No voltage

13 – Ground

Light control switch HEAD

Battery positive voltage

14 – Ground

Light control switch OFF

No voltage

14 – Ground

Light control switch TAIL or HEAD

Battery positive voltage