Lexus ES300 (1997 year). Manual — part 264

N21542

Wire Harness Side

1 2 3 4 5

e–5–1

N20569

UNLOCK

OFF

LOCK

1

2
3

N21543

Wire Harness Side

1

2

3

h–3–1–C

BE–120

–

BODY ELECTRICAL

POWER DOOR LOCK CONTROL SYSTEM

1504

1997 LEXUS ES300 (RM511U)

4.

INSPECT PASSENGER’S DOOR LOCK CONTROL
SWITCH CIRCUIT

Disconnect the connector from the switch and inspect the con-
nector on the wire harness side.

Tester connection

Condition

Specified condition

2 – Ground

Constant

Continuity

1 – Ground

Constant

Battery positive voltage

3 – Ground

Constant

Battery positive voltage

4 – Ground

Ignition switch position LOCK or ACC

No voltage

4 – Ground

Ignition switch position ON

Battery positive voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.

5.

INSPECT DOOR KEY LOCK AND UNLOCK SWITCH
CONTINUITY

Switch position

Tester connection

Specified condition

LOCK

1 – 2

Continuity

OFF

–

No continuity

UNLOCK

1 – 3

Continuity

If continuity is not as specified, replace the switch.

6.

INSPECT DOOR KEY LOCK AND UNLOCK SWITCH
CIRCUIT

Disconnect the connector from the switch and inspect the con-
nector on the wire harness side.

Tester connection

Condition

Specified condition

1 – Ground

Constant

Continuity

2 – Ground

Constant

Battery positive voltage

3 – Ground

Constant

Battery positive voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.

N20673

Lock

Unlock

4

1

N20570

3

2

2

3

N21554

3

Front Door

Rear Door

2

N21555

Front Door

3

2

Rear Door

N21556

3

Front Door

Rear Door

2

–

BODY ELECTRICAL

POWER DOOR LOCK CONTROL SYSTEM

BE–121

1505

1997 LEXUS ES300 (RM511U)

7.

INSPECT DOOR UNLOCK DETECTION SWITCH CON-
TINUITY

Switch position

Tester connection

Specified condition

OFF (Door Lock set to

LOCK)

–

No continuity

ON (Door Lock set to

UNLOCK)

1 – 4

Continuity

If continuity is not as specified, replace the switch.

8.

INSPECT MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
3 and the negative (–) lead to terminal 2, and check that
the door lock link moves to UNLOCK position.

(b)

Reverse the polarity and check that the door lock link
moves to LOCK position.

If operation is not as specified, replace the door lock assembly.

9.

INSPECT PTC THERMISTOR OPERATION (Using an
ammeter)

(a)

Connect the positive (+) lead from the battery to terminal
3.

(b)

Connect the positive (+) lead from the ammeter to termi-
nal 2 and the negative (–) lead to battery negative (–) ter-
minal, and check that the current changes from approxi-
mately 3.2 A to less than 0.5 A within 20 to 70 seconds.

(c)

Disconnect the leads from terminals.

(d)

Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 2 and the negative (–)
lead to terminal 3, and check that the door lock moves to
the LOCK position.

If operation is not as specified, replace the door lock assembly.

10.

INSPECT PTC THERMISTOR OPERATION (Using an
ammeter with a current–measuring probe)

(a)

Connect the positive (+) lead from the battery to terminal
3 and the negative (–) lead to terminal 2.

(b)

Attach a current–measuring probe to either the positive
(+) lead or the negative (–) lead, and check that the cur-
rent changes from approximately 3.2 A to less than 0.5 A
within 20 to 70 seconds.

N21555

Front Door

Rear Door

3

2

N21544

Wire Harness Side

1

2

3

4

le–4–1–E

Z19531

Lock

A25

A12

BE–122

–

BODY ELECTRICAL

POWER DOOR LOCK CONTROL SYSTEM

1506

1997 LEXUS ES300 (RM511U)

(c)

Disconnect the leads from terminals.

(d)

Approximately 60 seconds later, reverse the polarity, and
check that the door lock moves to the LOCK position.

If operation is not as specified, replace the door lock assembly.

11.

INSPECT DOOR LOCK ASSEMBLY CIRCUIT

Disconnect the connector from the switch and inspect the con-
nector on the wire harness side.

Tester connection

Condition

Specified condition

4 – Ground

Constant

Continuity

1 – Ground

3 – Ground

Door lock manual switch OFF or LOCK

No voltage

1 – Ground

3 – Ground

Door lock manual switch UNLOCK

Battery positive voltage

2 – Ground

Door lock manual switch OFF or UNLOCK

No voltage

2 – Ground

Door lock manual switch LOCK

Battery positive voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.

12.

Door Lock Signal:
INSPECT INTEGRATION RELAY OPERATION

HINT:
When the relay circuit is as specified, inspect the door lock sig-
nal.
(a)

Connect the positive (+) lead from the voltmeter to termi-
nal A12 and the negative (–) lead to terminal A25.

(b)

Set the door lock control switch to UNLOCK and check
that the voltage rises from 0 V to battery positive voltage
for approximately 0.2 seconds.

Z19532

Unlock

A25

A12

–

BODY ELECTRICAL

POWER DOOR LOCK CONTROL SYSTEM

BE–123

1507

1997 LEXUS ES300 (RM511U)

(c)

Reverse the polarity of the voltmeter leads.

(d)

Set the door lock control switch to LOCK and check that
the voltage rises from 0 V to battery positive voltage for
approximately 0.2 seconds.

If operation is not as specified, replace the relay.
13.

INSPECT INTEGRATION RELAY CIRCUIT
(See page

BE–20

)