Lexus ES300 (1997 year). Manual - part 171

N21499

Instrument Panel
Junction Block

 Integration Relay

 GAUGE Fuse

Ignition Switch and
Key Unlock Warning Switch

BE04U–01

–

BODY ELECTRICAL

IGNITION SWITCH AND KEY UNLOCK WARNING 
SWITCH

BE–19

1403

1997 LEXUS ES300   (RM511U)

IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH

LOCATION

BE04V–01

N14824

4

8 7

3 2 1

6 5

LOCK

ACC

ON

START

N21360

4 3 2 1

5

6

7

8

From Back Side

LOCK

ACC

ON

START

BE–20

–

BODY ELECTRICAL

IGNITION SWITCH AND KEY UNLOCK WARNING 
SWITCH

1404

1997 LEXUS ES300   (RM511U)

INSPECTION

1.

INSPECT IGNITION SWITCH CONTINUITY

Switch position

Tester connection

Specified  condition

LOCK

–

No continuity

ACC

2 – 3

Continuity

ON

2 – 3 – 4

6 – 7

Continuity

START

1 – 2 – 4

6 – 7 – 8

Continuity

If continuity is not as specified, replace the switch.

2.

INSPECT IGNITION SWITCH CIRCUIT

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

Tester connection

Condition

Specified condition

1– Ground

Ignition switch START

Battery positive voltage

2 – Ground

Constant

Battery positive voltage

3 – Ground

Ignition switch ACC or ON

Battery positive voltage

4 – Ground

Ignition switch ON

Battery positive voltage

6 – Ground

Ignition switch ON

Battery positive voltage

7 – Ground

Constant

Battery positive voltage

8– Ground

Ignition switch START

Battery positive voltage

If circuit is not as specified, inspect the switch and circuits con-
nected to other parts.

N20125

OFF

ON

1

2

N21361

From Back Side

1

2

N20129

10

5

1

6

N20130

10       6       5     1

–

BODY ELECTRICAL

IGNITION SWITCH AND KEY UNLOCK WARNING 
SWITCH

BE–21

1405

1997 LEXUS ES300   (RM511U)

3.

INSPECT KEY UNLOCK WARNING SWITCH CONTI-
NUITY

Switch position

Tester connection

Specified  condition

OFF (Key removed)

–

No continuity

ON (Key set)

1 – 2

Continuity

If continuity is not as specified, replace the switch.

4.

INSPECT KEY UNLOCK WARNING SWITCH CIRCUIT

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

Tester connection

Condition

Specified condition

2– Ground

Ignition key removed

No continuity

2– Ground

Ignition key set

Continuity

1– Ground

Constant

Continuity

If circuit is not as specified, inspect the switch and circuits con-
nected to other parts.

5.

Key Unlock Warning System:
INSPECT INTEGRATION RELAY OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
1.

(b)

Connect the negative (–) lead from the battery to termi-
nals 5, 6 and 10.

(c)

Check the buzzer sounds.

(d)

Disconnect the negative (–) lead from the battery to termi-
nal 6.

(e)

Check that the buzzer stops sounding.

N20131

10        6       5     1

N20135

Junction Block Side

1211

1

2

3

10

9 8 7 6 5 4

BE–22

–

BODY ELECTRICAL

IGNITION SWITCH AND KEY UNLOCK WARNING 
SWITCH

1406

1997 LEXUS ES300   (RM511U)

(f)

Connect the negative (–) lead from the battery to terminal
6.

(g)

Disconnect the negative (–) lead from the battery to termi-
nal 5.

(h)

Check that the buzzer stops sounding.

If operation is not as specified, replace the relay.

6.

INSPECT INTEGRATION RELAY CIRCUIT

(a)

Remove the relay from the junction block No.1 and in-
spect the connector on the junction block side.

Tester connection

Condition

Specified  condition

2 – Ground

All door courtesy switches OFF (Door closed)

No continuity

2 – Ground

One of the door courtesy switches ON (Door

opened)

Continuity

4 – Ground

Door courtesy switches except that of the driver’s

door OFF (Door closed)

No continuity

4 – Ground

One of the door courtesy switches except that of

the driver’s door ON (Door opened)

Continuity

3 – Ground

Door outside handle switch OFF

No continuity

3 – Ground

Door outside handle switch ON

Continuity

5 – Ground

Key unlock warning switch OFF

No continuity

5 – Ground

Key unlock warning switch ON

Continuity

6 – Ground

Driver’s door courtesy switch OFF (Door closed)

No continuity

6 – Ground

Driver’s door courtesy switch ON (Door opened)

Continuity

8 – Ground

Buckle switch OFF (Seat belt unfastened)

No continuity

8 – Ground

Buckle switch ON (Seat belt fastened)

Continuity

10 – Ground

Constant

Continuity

1 – Ground

Constant

Battery positive voltage

7 – Ground

9 – Ground

Ignition switch LOCK or ACC

No voltage

7 – Ground

9 – Ground

Ignition switch ON

Battery positive voltage

11 – Ground

Ignition switch LOCK

No voltage

11 – Ground

Ignition switch ACC or ON

Battery positive voltage