Lexus LS400 (2000 year). Manual — part 19

BE–158

–

BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

2021

Disconnect the connector of wireless door lock
control cancel switch (buzzer switch) and
connect the tester between connector terminal 2
on the wire harness side and body ground.
(voltage range)

After turning wireless door lock control cancel switch
(buzzer switch) ON, when operating each switch under
the standard operation, check that the buzzer chirps
once (locked) twice (unlocked) and once (luggage
door unlocked).

No

Yes

2 Wireless door lock buzzer does not chirp.

When performing UNLOCK – LOCK operation with
wireless door lock function, check voltage of more than
10 V is output once (locked), twice (unlocked) and
once (luggage door unlocked).
(Check the voltage in the bar graph.)

No

Chirping operation check:

Check that door LOCK and UNLOCK function normally
with wireless door lock function.

Proceed to chart 1 or chart 2.
(Wireless door lock function faulty.)

No

Yes

Normal.

MPX body ECU output check:

Yes

Connect the tester between connector
terminal 3 of MPX body ECU and
body ground. (voltage range)

When performing UNLOCK – LOCK operation with
wireless door lock function, check voltage of more
than 10 V is output once (locked), twice (unlocked)
and once (luggage door unlocked).
(Check the voltage in the bar graph.)

MPX body ECU output check:

MPX body ECU faulty.

MPX body ECU faulty.
Wireless door lock control cancel switch
(buzzer switch) wire harness side faulty.

Yes

No

–

BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

BE–159

2022

Connect the wireless door lock control
cancel switch (buzzer switch) connector.

Check that wireless door lock control cancel switch
(buzzer switch) operates normally?
(Refer to ”wireless door lock control cancel switch
(buzzer switch) inspection”.)

Unit check:

No

Yes

Wireless door lock control cancel
switch (buzzer switch) faulty.

Disconnect the connector of buzzer and
connect between connector terminal 2
on the wire harness side and body ground.
(voltage range)

When performing UNLOCK – LOCK operation with
wireless door lock function, check voltage of more than
10 V is output once (locked), twice (unlocked) and
once (luggage door unlocked).
(Check the voltage in the bar graph.)

No

MPX body ECU output check:

Yes

Wire harness faulty between wireless
door lock control cancel
switch (buzzer switch) and buzzer.

Check continuity exists between connector terminal 2
on the wire harness of the buzzer and MPX body ECU
terminal 4 on the side of MPX body ECU.

No

Continuity check:

Yes

Wire harness faulty between buzzer
and MPX body ECU.

Buzzer faulty.

BE0CJ–01

I04149

BE–160

–

BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

2023

INSPECTION

1.

INSPECT WIRELESS DOOR LOCK TRANSMITTER
OPERATION

HINT:
Refer to ”Wireless door lock control receiver and transmitter re-
placement”.
(a)

Using a screwdriver, remove the screw and cover.

(b)

Remove the battery (lithium battery).

(c)

Install a new or normal battery (lithium battery).

HINT:
When a new or normal battery can not be obtained, connect 2
new 1.5 V batteries in series, connect the battery (+) to the bat-
tery receptacle side terminal and battery (–) to the bottom termi-
nal, then apply 3 V voltage to the transmitter.
(d)

In the location where is approx. 1 M away from driver’s
outside handle in the right direction, face the key plate of
the transmitter to the vehicle, and check the transmitter
operation when pressing transmission switch on the side
of the transmitter body.

Standard:

Remote control of vehicle door lock can be operated.

LED lights up more than once.

HINT:

The minimum operation distance differs according to op-
erator, the way of holding, and location.

As weak wave is used, operation distance might be short-
ened when noise is detected in strong wave or used fre-
quency.

(e)

Install the battery (lithium battery).

(f)

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

(g)

Using a screwdriver, tighten the screw.

I04150

I04151

–

BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

BE–161

2024

2.

CHECK BATTERY CAPACITY

HINT:

Make sure to use the TOYOTA electrical tester.

With the battery unloaded, judge can not be made wheth-
er the battery is available or not on the test.

When the transmitter is faulty, the energy amount left in
the battery might not be checked correctly.

On the lithium battery used for the transmitter, the voltage
more than 2.5 V with the battery unloaded is shown on the
tester until the energy is completely consumed.
Accordingly when inspecting the energy amount left in the
battery, it is necessary to measure the voltage when the
battery is loaded. (1.2 k

Ω

).

(a)

Remove the screws and cover using a (–) driver.

(b)

Remove the battery (lithium battery) from the transmitter.

(c)

Connect the lead to the (–) terminal of the transmitter and
install the battery.

(d)

Connect the (+) tester to the (+) battery (lithium battery),
and (–) tester to the lead respectively.

(e)

Press one of the transmitting switches on the transmitter
for approx. 1 second.

(f)

Press the transmitting switch on the transmitter again to
check the voltage.
Standard: 2.1 V or more