2000 LEXUS GS400 Service Repair Manual

Disarming condition
Any of the following conditions is met

When all doors and engine hood are closed, lock all the doors using a key.

When all doors and engine hood are closed, lock all the doors using wireless remote function.

When all doors and engine hood are closed, open and close either of doors and engine hood
then close and lock all doors and engine hood.
Disarming preparation condition
Any of the following conditions is met

30 seconds elapse when the engine hood
is closed and all doors are locked.
Any of the following conditions is met

Close and open either of all doors and
engine hood.

Lock and unlock either of doors.

Insert a key into the ignition key cylinder.

Reconnect the battery.
Arming condition
Any of the following conditions is met

Unlock the locked doors using the wireless
remote function.

Unlock the locked doors using the key.

Insert the key into the ignition key cylinder
and turn the ignition key ON.
Any of the following conditions is met

Either of closed doors opens.

Either of locked doors is unlocked by any
operation other than key or wireless remote
function.

The closed engine hood is opened.

The battery is reconnected.
Alarming condition
Any of the following conditions is met

Unlock the locked doors using the wireless
remote function.

Unlock the locked doors using the key.

Insert the key into the ignition key cylinder
and turn the ignition key ON.
In this mode, once theft is detected, it is
informed using light and sound to people
around the vehicle.
The alarming time described above passes.
(Key not inserted in ignition cylinder.)
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
BE±143
2444 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
2. ACTIVE ARMING MODE

BE±144
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
2445 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
Indicator light output:
ConditionIndicator light
Disarming conditionOFF
Arming preparation conditionON
Arming conditionOFF
Alarming conditionON
HINT:
Even in disarming condition, the indicator light flash. (Due to the
signal output form immobilizer system). The indicator always
flashes receiving the signal from the immobilizer system at any
time in the arming condition.
Flashing frequency:
0.75 seconds (ON)
1.25 seconds (OFF)
3. PASSIVE ARMING MODE
This mode can be switched according to the specified op-
eration.
All initially set modes (when shipped from factory) are ac-
tive mode. (No passive mode)

Disarming condition (A)
Disarming preparation condition
Any of the following
conditions is met

With all doors and
engine hood closed
30 seconds elapse.
Arming condition
Any of the following conditions is met
(Refer to HINT * on the next page)

Press unlock switch of the wireless.

Insert the key into the driver and passenger
doors key cylinders, turn the key to unlock.

Insert the key into the ignition key cylinder
and turn the key to ON.
Any of the following conditions is met

Either of closed door is opened and entry
delay time elapses. (Refer to HINT on the
next page)

Engine hood is closed and opened.

Battery is reconnected.
Alarming condition
In this mode, once theft is detected, it is
informed using light and sound to people
around the vehicle.
The alarming time described above passes.
Any of the following conditions is met

Pull the key out of the ignition key cylinder which the key was inserted in.
Disarming condition (B)
Any of the following conditions is met

Press the unlock button of wireless.

Insert the key into the key cylinder of driver
or passenger seat and turn the key to unlock.

Insert the key into the ignition key cylinder.

Reconnect the battery.
Any of the following conditions is met

Open and close either of all doors and
engine hood.
Any of the following conditions is
met

Close and open either of
all doors and engine hood.Any of the following conditions is met

Press the unlock button of wireless.

Insert the key into the key cylinder of driver
or passenger seat and turn the key to unlock.

Insert the key into the ignition key cylinder.

Reconnect the battery.
Any of the following conditions is met

Press unlock switch of the wireless.

Insert the key into the driver and passenger
doors key cylinders, turn the key to unlock.

Insert the key into the ignition key cylinder
and turn the key to ON.
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
BE±145
2446 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

Door
Indicator
Alarming output
System condition
Arming condition Alarming
condition Entry delay time Close
Open
ON
OFF
ON
OFF BE±146
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
2447 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
HINT:
In arming condition either closed door is opened, entry delay
occurs. (15 secs.)
During this time, the mode transfers to disarming condition
when the condition described above * is met.
When the condition is not met, the system judges theft occurs,
the mode transfers to alarming condition.
(a) Indicator light output:
ConditionIndicator light
Disarming conditionOFF
Arming preparation conditionON
Arming condition
(Entry delay time)OFF
(ON)
Alarming conditionON
HINT:
Even in disarming condition, the indicator light flash. (Due to the
signal output form immobilizer system). The indicator always
flashes receiving the signal from the immobilizer system at any
time in the arming condition.
Flashing frequency:
0.75 seconds (ON)
1.25 seconds (OFF)

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)