Lexus ES300 (1997 year). Service manual — part 172

N20137

Wire Harness Side

Wire Harness Side

Connctor ”A”

Connctor ”B”

1

4

7

10

2 3

5 6

8 9

11

12 13 14 15 16 17 18 19 20 21 22 23 24 25

1

4

2 3

eh–25–1

h–4–1

–

BODY ELECTRICAL

IGNITION SWITCH AND KEY UNLOCK WARNING
SWITCH

BE–23

1407

1997 LEXUS ES300 (RM511U)

(b)

Disconnect the connector from the integration relay and
inspect the connectors on the wire harness side.

Tester connection

Condition

Specified condition

A3 – Ground

Constant

Continuity

A5 – Ground

Driver’s door unlock detection switch OFF (Door

closed)

No continuity

A5 – Ground

Driver’s door unlock detection switch ON (Door

opened)

Continuity

A6 – Ground

Passenger’s door courtesy switch OFF (Door

closed)

No continuity

A6 – Ground

Passenger’s door courtesy switch ON (Door

opened)

Continuity

A7 – Ground

Passenger’s door unlock detection switch OFF

(Door closed)

No continuity

A7 – Ground

Passenger’s door unlock detection switch ON

(Door opened)

Continuity

A9 – Ground

Rear door unlock detection switch OFF (Door

closed)

No continuity

A9 – Ground

Rear door unlock detection switch ON (Door

opened)

Continuity

A11 – A12

A12 – A25

Constant

Continuity

A16 – Ground

Door lock manual switch OFF or UNLOCK

No continuity

A16 – Ground

Door lock manual switch LOCK

Continuity

A17 – Ground

Door lock manual switch OFF or LOCK

No continuity

A17 – Ground

Door lock manual switch UNLOCK

Continuity

A18 – Ground

Driver’s and passenger’s door key lock and

unlock switch OFF or UNLOCK

No continuity

A18 – Ground

Driver’s or passenger’s door key lock and unlock

switch LOCK

Continuity

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