key LEXUS GS400 2000 Service User Guide

Remove the ignition key from key cylinder.
All the doors, engine hood and luggage
compartment door are closed and unlocked.
Any of doors is locked and unlocked by turns
3 times by the key or remote control.
Driver's side knob for door lock is locked and
unlocked 3 times.
Driver's side door is opened.
The system starts force lock at once after 2
sec.
Driver's side knob for door lock is unlocked.
Driver's side door is closed and opened 2
times
Driver's side knob for door lock is locked and
unlocked.
The system starts force lock at once after 2
secs.
PASSIVE MODE OFF
Driver's side door is closed and opened 4
times
Driver's side knob for door lock is locked and
unlocked.
The system starts force lock at once after 2
sec.
PASSIVE MODE ON
Within
30 sec.
Within
20 sec.
HINT:

Initial mode is PASSIVE MODE OFF.

If there is a different signal in the middle of changing. It is invalid.
Input to the vehicle
Output from the vehicle BE±148
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
2449 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. CHANGING METHOD OF PASSIVE MODE
(ON or OFF)

BE0GR±04
I04055
2 5
I04146
I04147
Not turned
UNLOCK
I04148
ON OFF BE±150
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
2451 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT THEFT DETERRENT INDICATOR LIGHT OP-
ERATION
Connect the positive (+) lead from the battery terminal 2 and
negative (±) lead to terminal 5, and check that the warning light
lights up.
If operation is not as specified, replace the light control rheostat.
2. INSPECT THEFT DETERRENT INDICATOR LIGHT
CIRCUIT
(See page DI±808)
3. INSPECT THEFT DETERRENT HORN OPERATION
Connect the positive (+) lead from the battery to the terminal 1
and negative (±) lead to theft deterrent horn body, and check
that the theft deterrent horn blows.
If operation is not as specified, replace the horn.
4. INSPECT THEFT DETERRENT HORN CIRCUIT
(See page DI±804)
5. INSPECT LUGGAGE COMPARTMENT DOOR KEY
LOCK AND UNLOCK SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
Not turned±No continuity
UNLOCK1 ± 2Continuity
If continuity is not as specified, replace the switch.
6. INSPECT LUGGAGE COMPARTMENT DOOR KEY
LOCK AND UNLOCK SWITCH CIRCUIT
(See page DI±794)
7. INSPECT ENGINE HOOD COURTESY SWITCH CON-
TINUITY
Switch positionTester connectionSpecified condition
LOCK±No continuity
UNLOCK1 ± 2Continuity
If continuity is not as specified, replace the switch.
8. INSPECT ENGINE HOOD COURTESY SWITCH CIR-
CUIT
(See page DI±790)

BE0GM±07
I01366
Door Lock Assembly

Door Lock Motor

Door Unlock Detection
Switch

Door Key Lock and
Unlock SwitchDoor Lock Assembly

Door Lock Motor

Door Unlock Detection Switch

Door Key Lock and Unlock Switch
Transmitter
Wireless Door
Lock Control Receiver Wireless Door Lock Control Buzzer
Ignition Switch
Door Lock Assembly

Door Lock Motor

Door Unlock Detection Switch

Door Key Lock and Unlock Switch
± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
BE±151
2452 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
WIRELESS DOOR LOCK CONTROL SYSTEM
LOCATION

BE0GN±01
BE±152
± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
2453 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
PRE±CHECK
Make the vehicle in the initialized condition:
The initialized condition is the condition when the following conditions are satisfied.
(1) Key plate has not been inserted in the ignition key cylinder.
(2) All the doors are closed. (Door warning light is OFF.)
(3) All the doors are locked.
(4) Wireless door lock control switch (Buzzer switch) is ON.
Under the standard operation, when repeating UNLOCK and LOCK switch 3 times or more alternately, check the
UNLOCK±LOCK operation from 3rd time onward.

Following procedures are standard operation.
(1) Keep about 1 M away to the right direction from the outside handle of a driver's seat.
(2) Face the transmitter toward the vehicle and press one of transmitter switches for about 1 sec.


As of the security function, even the wireless function is normal, there may be the case that only UNLOCK opera-
tion will not work.

As of the body customize function, if ºoperation twiceº has been set using LEXUS hand±held tester, only driver's
seat is unlocked by unlock operation performed once.
Normal


Operative distance may differ according to
an operator, the way of holding the transmitter
or position.

Because weak electric wave is used, when
there is strong wave or noise in the used
frequency ,operation distance might be
shortened.
No Yes
Only wireless function (Remote control) will not operate.
(If a new transmitter or a transmitter of the same type that works properly with the vehicle is not available.)
Check when pressing UNLOCK switch
and LOCK switch under standard
operation, that the transmitter LED
lights up once more.
NoYe s
Basic function check:
Transmitter LED inspection:

± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
BE±153
2454 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
Replace the transmitter battery with a new or normal
one and check UNLOCK±LOCK function works under
the standard operation.


The battery should be replaced by only the shops with
sufficient skill as new or normal battery is necessary.

Battery quality can be judged by checking the rem-
nant volume of the battery.
Ye s
Battery faulty.
No
Make the vehicle be in the initialized condition.
Enter into the self diagnostic mode.
If operating door control receiver in the order of 1 through 2, the mode turns to diagnostic mode.
(1) Insert the key plate in the ignition key cylinder and pull out, then insert it again and turn ignition switch
OFF " ON " OFF once within 5 seconds after pulling out.
(2) After completing the procedure within 30 seconds, turn the ignition switch OFF " ON " OFF 9 times.
HINT:
In the case that either (1) or (2) condition is not satisfied, transfer to normal mode.

When completing self diagnostic mode, turn the ignition switch ON.
LOCK and UNLOCK operation and output of luggage door opener signal are not performed under the self
diagnostic mode.
1st time 9th time ON
OFF
Transmitter battery check:
Inspection start by using self diagnostic mode:
within.
30 sec.within.
5 sec.
123 9
10
Key plate
not inseted
Key plate
inseted
Ignition
switch

BE±154
± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
2455 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
No
No
(Not entered in self
diagnostic mode)Is the method to enter into the
diagnostic mode correct?
Self diagnostic mode operation check:
Ye s
(Entered in self diagnostic mode)
After the self diagnostic mode input operation has
been performed, check that the buzzer chirps.
ON
OFF BuzzerIgnition switch OFF
0.13 sec. 0.5 sec.
Is the chirping function of operation
confirmation buzzer normal?
Check door control buzzer.
Check that continuity exists between
connector terminal A3 of MPX body ECU
on the vehicle side and ground by
inserting the key plate into the ignition
key cylinder. Key unlock warning switch inspection:
Ye s Ye s
No
Check key unlock warning switch.
Self diagnostic mode check:
Check that how the buzzer chirps when pressing
each transmitter switch.
ON
OFF Buzzer
0.13 sec.0.5 sec.
(1) Receiver normal wave of LOCK switch.
ON
OFF Buzzer
0.13 sec.
0.25 sec.
(2) Receiver normal wave of UNLOCK switch.
0.5 sec.
ON
OFF Buzzer
(3) Receiver normal wave of luggage door switch.
0.5 sec.0.5 sec.
ON
OFF (4) Incompatibility of the recognition code or out
from synchronization of rolling code.
While receiving
:
While turning the ignition switch ON in the self
diagnostic mode, the mode returns to normal mode. Buzzer
(1), (2) or (3) are output.(4) is output.
(All buzzer's response
is same.)
Recognition code registration function check:
Check that it is possible to enter into
rewrite mode or add mode.
(Refer to ºWireless door lock receiver and
transmitterº ± ºRecognition code registrationº.)
Wireless door lock operates
normally when recognition code
is registered.
No response from buzzer

BE0GO±04
I04149
± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
BE±157
2458 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT WIRELESS DOOR LOCK TRANSMITTER
OPERATION
HINT:
Refer to ºWireless door lock control transmitter battery replace-
mentº on page BE±161.
(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 the transmitter, 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.

I04153
From Back Side BE±160
± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
2461 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. INSPECT WIRELESS DOOR LOCK CONTROL RE-
CEIVER CIRCUIT
Connector connected:
Connect the wire harness side connector to the receiver and in-
spect the wire harness side connector from the back side, as
shown.
Tester connectionConditionSpecified 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 ON
10 ±14 V
If circuit is as specified, replace the receiver.
If the circuit is not as specified, inspect the circuits connected
to other parts.

BE0GP±09
I04154
I04155
I04156
Terminal
± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
BE±161
2462 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
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.

± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
BE±163
2464 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
Start registration of recognition code
The vehicle should be in the following conditions.

Any door is OPEN. (Other doors are CLOSED)

Any door is UNLOCKED.

Insert the key into the ignition key cylinder, then pull it out.
Press the door lock control switch (for manual operation) 5 times to
LOCK/UNLOCK at approx. 1 sec. interval.
1st time 2nd time 3rd time 4th time 5th time
LOCK
OFF
UNLOCK
Approx.
1 sec.Approx.
1 sec.
Close the all door, then open the any door.
Again press the door lock control switch (for manual operation) 5 times to
LOCK/UNLOCK at approx. 1 sec. interval.
1st time 2nd time 3rd time 4th time 5th time
LOCK
OFF
UNLOCK
Approx.
1 sec.Approx.
1 sec.
Insert the key into the ignition key cylinder.
Within
40 secs.
Within
40 secs.