Lexus LS400 (2000 year). Manual — part 15

Z14954

Front Door

Rear Door

Lock

Unlock

Lock

Unlock

N13456

Lock

Unlock

N13457

Example: Front Door

BE–142

–

BODY ELECTRICAL

POWER DOOR LOCK CONTROL SYSTEM

2005

15.

INSPECT LUGGAGE COMPARTMENT DOOR OPEN-
ER MOTOR CIRCUIT (See page

DI–694

)

16.

INSPECT DOOR LOCK MOTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
2 and the negative (–) lead to terminal 5, and check that
the door lock link moves to UNLOCK position.

(b)

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

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

17.

Using an ammeter:
INSPECT POWER DOOR LOCK MOTOR PTC THERM-
ISTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
2.

(b)

Connect the positive (+) lead from the ammeter to termi-
nal 5 and the negative (–) lead to battery negative (–) ter-
minal, and check that the current changes from approxi-
mately 3.2 ampere to less than 0.5 ampere with 20 to 70
seconds.

N13458

Example: Front Door

N13459

Example: Front Door

N13458

Example: Front Door

Z14955

Wire Harness Side

–

BODY ELECTRICAL

POWER DOOR LOCK CONTROL SYSTEM

BE–143

2006

(c)

Disconnect the leads from terminals.

(d)

Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 5 and the negative (–)
lead to terminal 2, and check that the door lock moves to
LOCK position.

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

18.

Using an ammeter with a current–measuring probe:
INSPECT POWER DOOR LOCK MOTOR PTC THERM-
ISTOR OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
2 and the negative (–) lead to terminal 5.

(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 ampere to less than
0.5 ampere within 20 to 70 seconds.

(c)

Disconnect the leads from terminals.

(d)

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

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

19.

INSPECT POWER DOOR LOCK MOTOR CIRCUIT

(a)

Disconnect the connector from the motor.

(b)

Connect the connector to the driver door ECU, front pas-
senger door ECU and Body ECU.

(c)

Inspect the connector on the wire harness side, as
shown.

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

Tester connection

Condition

Specified condition

2 – Ground

Ignition switch ON and door lock control

switch LOCK

No voltage

2 – Ground

Ignition switch ON and door lock control

switch UNLOCK

Battery positive voltage

5 – Ground

Ignition switch ON and door lock control

switch UNLOCK

No voltage

5 – Ground

Ignition switch ON and door lock control

switch LOCK

Battery positive voltage

N13460

OFF

BE–144

–

BODY ELECTRICAL

POWER DOOR LOCK CONTROL SYSTEM

2007

2 – Ground

Ignition switch ON and master switch

LOCK

No voltage

2 – Ground

Ignition switch ON and master switch

UNLOCK

Battery positive voltage

5 – Ground

Ignition switch ON and master switch

UNLOCK

No voltage

5 – Ground

Ignition switch ON and master switch

LOCK

Battery positive voltage

20.

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 door lock assembly.
HINT:
Door unlock detection switch is built into the door lock assem-
bly.
If continuity is as specified, inspect the door lock assembly cir-
cuit.
21.

Driver’s door:
INSPECT DOOR LOCK ASSEMBLY CIRCUIT
(See page

DI–741

)

22.

Front passenger’s door:
INSPECT DOOR LOCK ASSEMBLY CIRCUIT
(See page

DI–773

)

23.

Rear left door:
INSPECT DOOR LOCK ASSEMBLY CIRCUIT
(See page

DI–803

)

24.