LEXUS GS400 2000 Service Repair Manual

N09348
ECULEXUS hand±held tester
LEXUS Break±out±box
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
BE±147
2448 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Transfer to active mode:
In each passive mode, when ºdisarming condition of ac-
tive mode " arming preparation transfer conditionº is
met, the active mode transfers to each condition. In this
case, active mode continues till disarming condition.
Passive mode when transfer condition is
met.Active mode transfer condition
Disarming conditionArming preparation condition
Arming preparation conditionArming preparation condition
Arming condition
(During entry delay time)Arming condition
(After alarming time has elapsed, arming
condition)
Alarming conditionAfter alarming time has elapsed, arming
condition
4. CHANGING METHOD OF PASSIVE MODE (ON or OFF)
Using a hand±held tester, the mode can be changed to the pas-
sive mode.
5. ECU TERMINAL VALUES MEASUREMENT BY USING
LEXUS BREAK±OUT±BOX AND LEXUS HAND±HELD
TESTER
(a) Hook up the LEXUS break±out±box and LEXUS hand±
held tester to the vehicle.
(b) Read the ECU input/ output values by following the
prompts on the tester screen.
(c) Please refer to the LEXUS hand±held tester has a ºSnap-
shotº function. This records the measured data and is ef-
fective in the diagnosis of intermittent problems.

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)

N09348
ECULEXUS hand±held tester
LEXUS Break±out±box
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
BE±149
2450 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
7. ECU TERMINAL VALUES MEASUREMENT BY USING
LEXUS BREAK±OUT±BOX AND LEXUS HAND±HELD
TESTER
(a) Hook up the LEXUS break±out±box and LEXUS hand±
held tester to the vehicle.
(b) Read the ECU input/ output values by following the
prompts on the tester screen.
(c) Please refer to the LEXUS hand±held tester has a ºSnap-
shotº function. This records the measured data and is ef-
fective in the diagnosis of intermittent problems.

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.
<Reference>

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
<Reference>

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.
<Reference>

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.
<Reference>
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
<Reference>:
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

± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
BE±155
2456 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
Transmitter faulty or wireless door lock receiver
faulty.
<Reference>
Check the wave reaching range with another
transmitter (normal). When the range is normal,
transmitter defection is detected, the range is
not normal, wireless door lock receiver defection
is detected.
The wave reaching range check:
Is the wave reaching range normal?
(1 M area around vehicle)
(While the transmitting switch is pressed,
(approx. 20 secs.) the buzzer chirps continuously.
After 20 secs., repress the switch again.)
NoOther body control system faylty.
(Transmitter and receiver are normal.)
Ye s
No
Wireless door control receiver check:
Check the diagnosis. (wirelss door lock signal error)
(Refer to ºMultiplex communication systemº)
Check that diagnostic code 42 is output.
Ye s
Wire harness faulty (short circuit)
Between the receiver terminal 4 (RDA) and
body ECU terminal B14 (RDA).Ye s
RDA terminal open circuit.
No
Check RDA terminal circuit.
Check that the voltage of RDA is 10 to 14 V
(without transmitting).
No
When pressing each switch of
the new or normal transmitter
used in the same type vehicle,
check that all buzzers chirp
in the same way.
Transmitter faulty.
Ye s
Using SST, connect terminal Tc and E1 of DLC1.

BE±156
± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
2457 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
Ye s
Wireless door control receiver power source check:
Check that there is 4.5 ± 5.5 V voltage at the
connector terminal 3 (RCO) of wireless door control
receiver under the vehicle initialized condition.
(1) Check that the control receiver voltage becomes
0 V during transmitting.
(2) When RCO is turned ON compulsoring with a
LEXUS hand±held tester, check that the wireless door
lock control receiver voltage becomes 0 V.
No
ECU±B1 and MPX±B, or P FR DOOR fuse
or wire harness faulty.
Ye s
+B power source check:
Check that there is constantly10 to 14 V voltage at the
connector terminal 1 (+B) of wireless door control
receiver.
No
Wire harness faulty.
Body ground open and contact error.
Ye s
Body ground check:
Check that continuity exists between the connector
terminal 7 (GND) of the wireless door control receiver
and body ground.
No
Wireless door control receiver faulty.Wire harness faulty (open circuit)
Between the receiver terminal 3 (CONT) and
body ECU terminal B5 (RCO).