Lexus LS400 (2000 year). Manual — part 20

N13470

I04935

2

1

BE–162

–

BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

2025

HINT:

When the temperature of the battery is low, the judge can
not be made correctly.
When the outcome of the test is less than 2.1 V, conduct
the test again after leaving the battery in the place at 18

°

C for more than 30 minutes.

By auto power off function, the voltage becomes no load
voltage (more than 2.5 V) condition after 0.8 seconds
from the switch was pressed.
Make sure to read the voltage before of it.

High voltage might be shown 1 to 2 times after leaving the
battery, judge should be made with the voltage shown at
the 3rd time or later.

(g)

Disconnect the lead.

(h)

Set the battery (lithium battery) in the transmitter.

(i)

Install the cover, so that the O–ring is not distorted or
slipped off.

(j)

Using a screwdriver, tighten the screws.

3.

INSPECT WIRELESS DOOR LOCK CONTROL CAN-
CEL SWITCH

Switch position

Tester connection

Specified condition

OFF

–

No continuity

ON

1 – 2

Continuity

If continuity is not as specified, replace the switch.
If continuity is as specified, inspect the switch circuit.
4.

INSPECT WIRELESS DOOR LOCK CONTROL CAN-
CEL SWITCH CIRCUIT (See page

DI–689

)

5.

INSPECT WIRELESS DOOR LOCK BUZZER OPERA-
TION

Connect the positive (+) lead from the ohmmeter to terminal 1
and the negative (–) lead to terminal 2, and measure resistance
approx. 1 k

Ω

.

If resistance is not as specified, replace the buzzer.
6.

INSPECT WIRELESS DOOR LOCK BUZZER CIRCUIT
(See page

DI–689

)

I04152

Wire Harness Side

I04153

From Back Side

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BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

BE–163

2026

7.

Connector disconnected:
INSPECT WIRELESS DOOR LOCK CONTROL RE-
CEIVER CIRCUIT

Disconnect the connector from the receiver and inspect the
connector on the wire harness side, as shown.

Tester connection

Condition

Specified condition

7 – Ground

Constant

Continuity

1 – Ground

Constant

Battery positive voltage

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

8.

Connector connected:
INSPECT WIRELESS DOOR LOCK CONTROL RE-
CEIVER CIRCUIT

Connect the wire harness side connector to the receiver and in-
spect the wire harness side connector from the back side, as
shown.

Tester connection

Condition

Specified condition

3 – Ground

Ignition switch position OFF

Key removed

Transmitter OFF

→

ON

4.5 – 5.5 V

→

below 1 V

3 – Ground

Ignition switch position OFF

Key removed

Transmitter OFF

→

ON

4.5 – 5.5 V

→

below 1 V

4 – Ground

Ignition switch position OFF

Key removed

Transmitter OFF

10 – 14 V

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

BE0CK–01

I04154

I04155

O–Ring

I04156

Terminal

BE–164

–

BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

2027

REPLACEMENT

1.

REPLACE TRANSMITTER (LITHIUM) BATTERY

NOTICE:
Special caution should be taken for handling each compo-
nent as they are precision electronic components.
(a)

Using a screwdriver, remove the screw and cover.

NOTICE:
Do not pry out the cover forcibly.
HINT:
Push the cover with a finger as shown in the illustration, so that
there becomes clearance, then pry out the cover from that
clearance.
(b)

Remove the transmitter.

(c)

Using a screwdriver, remove the 2 screws and cover.

(d)

Remove the battery (lithium battery).

NOTICE:

Do not push the terminals with a finger.

If prying up the battery (lithium battery) forcibly to re-
move, the terminals are deformed.

(e)

Install a battery (lithium battery) as shown in the illustra-
tion.

NOTICE:
Face the battery upward. Take care not to deform the termi-
nals.
(f)

Check that O–ring is not distorted or slipped off, and
install the cover.

(g)

Using a screwdriver, tighten the 2 screws.

NOTICE:
When the shrews are tightened loosely, it might cause
faulty contact of battery (lithium battery) and terminals.
(h)

Assemble the transmitter to the key plate and the cover.

(i)

Using a screwdriver, tighten the screw.

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BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

BE–165

2028

2.

REPLACE DOOR CONTROL RECEIVER AND TRANS-
MITTER

NOTICE:
When replacing the door control receiver and transmitter,
registration of recognition code is necessary because they
are provided as a single components.
(a)

Select the operation mode to perform from the following
operation modes.

Add mode

Rewrite mode

Prohibition mode

Confirmation mode

HINT:

The add mode is used to retain codes already registered
while you register new recognition codes. This mode is
used when adding a transmitter. However, if the number
of registered codes exceeds 4 codes, previously regis-
tered codes are correspondingly erased in order, starting
from the first registered code.

The rewrite mode is used to erase all previously regis-
tered codes and register only new recognition codes.

The prohibition mode is used to erase all registered codes
and cancels the wireless door lock function. Use this
mode when the transmitter is lost.

The confirmation mode is for confirming few many recog-
nition codes ar already registered before you register
additional recognition codes.

(b)

Follow the chart on the following page to register the
transmitter recognition code at the wireless door lock con-
trol receiver.

HINT:

When procedure is out of the specified, the operation re-
turns to normal operation.

Maximum 4 recognition codes can be registered.