Lexus ES300 (1997 year). Manual — part 239

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

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