Lexus RX300 (MCU15). Service manual — part 138

I19147

UNLOCK

LOCK

Door Lock Cable

UNLOCK

LOCK

4

3

4

3

I19148

2

UNLOCK

LOCK

UNLOCK

LOCK

2

1

1

Door Lock Cable

–

BODY ELECTRICAL

POWER DOOR LOCK CONTROL SYSTEM

BE–99

LEXUS RX300 (RM785E)

10.

Driver’s Door (LHD)/Passenger’s Door (RHD):
INSPECT DOOR LOCK MOTOR OPERATION

(a)

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

(b)

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

If operation is not as specified, replace the door lock assembly.
11.

Driver’s Door (LHD)/Passenger’s Door (RHD):
INSPECT DOOR LOCK MOTOR CIRCUIT
(See page DI–606)

12.

Passenger ’s door (LHD)/Driver’s Door (RHD):
INSPECT DOOR LOCK MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
2 and the negative (–) lead to terminal 1, and check that
the door lock cable moves to UNLOCK position.

(b)

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

If operation is not as specified, replace the door lock assembly.
13.

Front right side door:
INSPECT DOOR LOCK MOTOR CIRCUIT
(See page DI–628)

I19149

UNLOCK

LOCK

UNLOCK

LOCK

Door Lock Cable

2

6

6

2

I07312

LOCK

UNLOCK

UNLOCK

LOCK

3

2

3

2

I19150

4

3

UNLOCK

LOCK

Door Lock Cable

BE–100

–

BODY ELECTRICAL

POWER DOOR LOCK CONTROL SYSTEM

LEXUS RX300 (RM785E)

14.

INSPECT REAR DOOR LOCK MOTOR OPERATION

(a)

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

(b)

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

If operation is not as specified, replace the door lock assembly.
15.

INSPECT REAR DOOR LOCK MOTOR CIRCUIT
(See page DI–651)

16.

INSPECT BACK DOOR LOCK MOTOR OPERATION

(a)

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

17.

Using an ammeter:
INSPECT DRIVER’S DOOR (LHD)/PASSENGER’S
DOOR (RHD) PTC THERMISTOR OPERATION

(a)

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

(b)

Connect the negative (–) lead from the ammeter to termi-
nal 4 and the positive (+) lead to battery positive (+) termi-
nal, and check that the current changes from approxi-
mately 3.2 A to less than 0.5 A within 20 to 70 seconds.

I19152

4

3

LOCK

UNLOCK

Door Lock Cable

I19151

2

1

LOCK

UNLOCK

Door Lock Cable

I19153

2

1

LOCK

UNLOCK

Door Lock Cable

I19154

6

2

LOCK

UNLOCK

Door Lock Cable

I19155

6

2

LOCK

UNLOCK

Door Lock Cable

–

BODY ELECTRICAL

POWER DOOR LOCK CONTROL SYSTEM

BE–101

LEXUS RX300 (RM785E)

(c)

Disconnect the leads from terminals.

(d)

Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 3 and the negative (–)
lead to terminal 4, and check that the door lock cable
moves to the LOCK position.

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

18.

Using an ammeter:
INSPECT PASSENGER’S DOOR (LHD)/DRIVER’S
DOOR (RHD) PTC THERMISTOR OPERATION

(a)

Connect the negative (–) lead from the battery to terminal
1.

(b)

Connect the negative (–) lead from the ammeter to termi-
nal 2 and the positive (+) lead to battery positive (+) termi-
nal, 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 1 and the negative (–)
lead to terminal 2, and check that the door lock moves to
the LOCK position.

If operation is not as specified, replace the door lock cable as-
sembly.

19.

Using an ammeter:
INSPECT REAR DOOR PTC THERMISTOR OPERA-
TION

(a)

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

(b)

Connect the negative (–) lead from the ammeter to termi-
nal 2 and the positive (+) lead to battery positive (+) termi-
nal, 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 6 and the negative (–)
lead to terminal 2, and check that the door lock cable
moves to the LOCK position.

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

I07314

UNLOCK

3

2

I07316

LOCK

3

2

I19156

3

4

LOCK

UNLOCK

Door Lock Cable

I19152

4

3

LOCK

UNLOCK

Door Lock Cable

I19157

1

2

LOCK

UNLOCK

Door Lock Cable

BE–102

–

BODY ELECTRICAL

POWER DOOR LOCK CONTROL SYSTEM

LEXUS RX300 (RM785E)

20.

Using an ammeter:
INSPECT BACK DOOR PTC THERMISTOR OPERA-
TION

(a)

Connect the negative (–) lead from the battery to terminal
2.

(b)

Connect the negative (–) lead from the ammeter to termi-
nal 3 and the positive (+) lead to battery positive (+) termi-
nal, 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.

21.

Using an ammeter with a current–measuring probe:
INSPECT DRIVER’S DOOR (LHD)/PASSENGER’S
DOOR (RHD) PTC THERMISTOR OPERATION

(a)

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

(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.

(c)

Disconnect the leads from terminals.

(d)

Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 3 and the negative (–)
lead to terminal 4, and check that the door lock cable
moves to the LOCK position.

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

22.

Using an ammeter with a current–measuring probe:
INSPECT PASSENGER’S DOOR (LHD)/DRIVER’S
DOOR (RHD) PTC THERMISTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
2 and the negative (–) lead to terminal 1.

(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.