2000 LEXUS GS400 Service Repair Manual

I04142
21
UNLOCK
I04275
21
LOCK
I04143
5 6
UNLOCK
I04276
5 6
LOCK
± BODY ELECTRICALPOWER DOOR LOCK CONTROL SYSTEM
BE±135
2436 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
21. Rear right side door:
INSPECT DOOR LOCK MOTOR CIRCUIT
(See page DI±947)
22. Front left side door:
INSPECT PTC THERMISTOR OPERATION (Using an
ammeter)
(a) Connect the negative (±) lead from the battery to terminal
2.
(b) Connect the positive (+) lead from the ammeter to termi-
nal 1 and the negative (±) lead to battery negative (±) ter-
minal, and check that the current changes from approxi-
mately 3.2 A to less than 0.5 A within 20 to 70 seconds.
(c) Disconnect the leads from terminals.
(d) Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 2 and the negative (±)
lead to terminal 1, and check that the door lock moves to
the LOCK position.
If operation is not as specified, replace the door lock assembly.
23. Front right side door:
INSPECT PTC THERMISTOR OPERATION (Using an
ammeter)
(a) Connect the negative (±) lead from the battery to terminal
6.
(b) Connect the positive (+) lead from the ammeter to termi-
nal 5 and the negative (±) lead to battery negative (±) ter-
minal, and check that the current changes from approxi-
mately 3.2 A to less than 0.5 A within 20 to 70 seconds.
(c) Disconnect the leads from terminals.
(d) Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 6 and the negative (±)
lead to terminal 5, and check that the door lock moves to
the LOCK position.
If operation is not as specified, replace the door lock assembly.

I05179
21
UNLOCK
I05180
21
LOCK
I05181
43
UNLOCK
I05182
43
LOCK
I04279
21
UNLOCK BE±136
± BODY ELECTRICALPOWER DOOR LOCK CONTROL SYSTEM
2437 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
24. Rear left side door:
INSPECT PTC THERMISTOR OPERATION (Using an
ammeter)
(a) Connect the negative (±) lead from the battery to terminal
2.
(b) Connect the positive (+) lead from the ammeter to termi-
nal 1 and the negative (±) lead to battery negative (±) ter-
minal, and check that the current changes from approxi-
mately 3.2 A to less than 0.5 A within 20 to 70 seconds.
(c) Disconnect the leads from terminals.
(d) Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 2 and the negative (±)
lead to terminal 1, and check that the door lock moves to
the LOCK position.
If operation is not as specified, replace the door lock assembly.
25. Rear right side door:
INSPECT PTC THERMISTOR OPERATION (Using an
ammeter)
(a) Connect the negative (±) lead from the battery to terminal
4.
(b) Connect the positive (+) lead from the ammeter to termi-
nal 3 and the negative (±) lead to battery negative (±) ter-
minal, and check that the current changes from approxi-
mately 3.2 A to less than 0.5 A within 20 to 70 seconds.
(c) Disconnect the leads from terminals.
(d) Approximately 60 seconds later, connect the positive (+)
lead from the battery to terminal 4 and the negative (±)
lead to terminal 3, and check that the door lock moves to
the LOCK position.
If operation is not as specified, replace the door lock assembly.
26. Front left side door:
INSPECT PTC THERMISTOR OPERATION (Using an
ammeter with a current±measuring probe)
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (±) lead to terminal 2.
(b) Attach a current±measuring probe to either the positive
(+) lead or the negative (±) lead, and check that the cur-
rent changes from approximately 3.2 A to less than 0.5 A
within 20 to 70 seconds.

I04275
21
LOCK
I04280
5 6
UNLOCK
I04276
5 6
LOCK
I05178
21
UNLOCK
I05175
21
LOCK
± BODY ELECTRICALPOWER DOOR LOCK CONTROL SYSTEM
BE±137
2438 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(c) Disconnect the leads from terminals.
(d) Approximately 60 seconds later, reverse the polarity, and
check that the door lock moves to the LOCK position.
If operation is not as specified, replace the door lock assembly.
27. Front right side door:
INSPECT PTC THERMISTOR OPERATION (Using an
ammeter with a current±measuring probe)
(a) Connect the positive (+) lead from the battery to terminal
5 and the negative (±) lead to terminal 6.
(b) Attach a current±measuring probe to either the positive
(+) lead or the negative (±) lead, and check that the cur-
rent changes from approximately 3.2 A to less than 0.5 A
within 20 to 70 seconds.
(c) Disconnect the leads from terminals.
(d) Approximately 60 seconds later, reverse the polarity, and
check that the door lock moves to the LOCK position.
If operation is not as specified, replace the door lock assembly.
28. Rear left side door:
INSPECT PTC THERMISTOR OPERATION (Using an
ammeter with a current±measuring probe)
(a) Connect the positive (+) lead from the battery to terminal
1 and the negative (±) lead to terminal 2.
(b) Attach a current±measuring probe to either the positive
(+) lead or the negative (±) lead, and check that the cur-
rent changes from approximately 3.2 A to less than 0.5 A
within 20 to 70 seconds.
(c) Disconnect the leads from terminals.
(d) Approximately 60 seconds later, reverse the polarity, and
check that the door lock moves to the LOCK position.
If operation is not as specified, replace the door lock assembly.

I05176
43
UNLOCK
I05177
43
LOCK
I04020
BE±138
± BODY ELECTRICALPOWER DOOR LOCK CONTROL SYSTEM
2439 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
29. Rear right side door:
INSPECT PTC THERMISTOR OPERATION (Using an
ammeter with a current±measuring probe)
(a) Connect the positive (+) lead from the battery to terminal
3 and the negative (±) lead to terminal 4.
(b) Attach a current±measuring probe to either the positive
(+) lead or the negative (±) lead, and check that the cur-
rent changes from approximately 3.2 A to less than 0.5 A
within 20 to 70 seconds.
(c) Disconnect the leads from terminals.
(d) Approximately 60 seconds later, reverse the polarity, and
check that the door lock moves to the LOCK position.
If operation is not as specified, replace the door lock assembly.
30. INSPECT LUGGAGE COMPARTMENT DOOR OPEN-
ER MOTOR OPERATION
Connect positive (+) lead to the terminal 1 and negative (±) lead
to the opener motor body, and check that the motor operates.
31. INSPECT LUGGAGE COMPARTMENT DOOR OPEN-
ER MOTOR CIRCUIT
(See page DI±802)

I04021
Push (OFF)
Push and
Turn (ON)
Pull (ON)
B 2
L 1
2B
1L
± BODY ELECTRICALPOWER DOOR LOCK CONTROL SYSTEM
BE±139
2440 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
32. INSPECT LUGGAGE COMPARTMENT DOOR OPEN-
ER MAIN SWITCH CONTINUITY
Switch operationTester connectionSpecified condition
OFF (Push)±No continuity
ON (Push and turn)1 ± 2Continuity
If continuity is not as specified, replace the switch.
33. INSPECT LUGGAGE COMPARTMENT DOOR OPEN-
ER SWITCH CONTINUITY
Switch operationTester connectionSpecified condition
OFF2 ± BContinuity
ON (Pull)1 ± L
2 ± BContinuity
If continuity is not as specified, replace the switch.
34. INSPECT LUGGAGE COMPARTMENT DOOR OPEN-
ER SWITCH AND MAIN SWITCH CIRCUIT
(See page DI±816)

BE0GQ±03
I01365
Luggage Compartment
Courtesy SwitchIgnition Switch
Door Lock Assembly

Door Lock Motor

Door Unlock Detection
Switch

Door Key Lock and
Unlock Switch
Door Lock Assembly

Door Lock Motor

Door Unlock Detection
Switch

Door Key Lock and Unlock SwitchLuggage Compartment
Opener Switch
Luggage Compartment
Key Lock and Unlock
Switch
Horn Theft Deterrent HornEngine Room No.1 Junction Block

HORN Fuse

Headlight Control Relay

Starter Relay
Engine Hood Courtesy Switch
Driver Side Junction Block

ST Fuse

Taillight Control RelayEngine Room No.2 Relay Block

Horn Relay
BE±140
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
2441 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
THEFT DETERRENT SYSTEM
LOCATION
The vehicle shown in this illustration is ºGS400º.
All components of ºGS300º other than the ones used for engine are same as ºGS400º.

DI3CO±10
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
BE±141
2442 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
PRE±CHECK
1. THEFT DETERRENT SYSTEM
When the system is set to the theft deterrent mode and any of
the following conditions are met, the system sounds the horns
and flashes the headlights and the taillights for approx. 1 min-
ute.
At the same time the system locks all doors (If all door are not
locked at once, the system repeats door locking operation ev-
ery 0.55 seconds during the one minute alarm time).
There are 2 modes in this system, which are active mode and
passive mode.
All initial setting are performed in active mode. It can be
switched to passive mode by specified operation. (See step 4.
CHANGING METHOD OF PASSIVE MODE)
Condition:
Any of the doors (Including the engine hood and luggage
compartment door) is unlocked or opened without the
key. *1
The battery terminal is disconnected and reconnected.
The system receives panic signal from remote keyless
entry. *2
*1: Only active arming mode.
*2: When the ignition key is not inserted in the key cylin-
der.
There are 4 conditions in this system which are disarming
condition, disarming preparation condition, arming condition
and alarming condition.
(a) Disarming condition:
(1) When a user is near the vehicle.
(2) When the alarming function does not operate.
(3) When theft deterrent function is not performed.
(b) Disarming preparation condition:
(1) Time from a user locks a door to be leaves the ve-
hicle.
(2) Time until transferring to disarming condition.
(3) Theft deterrent function is not performed.
(c) Arming condition:
(1) When a user leaves the vehicle completely.
(2) When theft deterrent function is possible.

BE±142
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
2443 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(d) Alarming condition:
Is this condition, once theft is detected, it is informed us-
ing light and sound to people around the vehicle.
Refer to the table for alarming method or time.
Horn
Al i th dSecurity hornAlarming methodHeadlight
Taillight
Alarming time60 seconds
Alarming outputContinuous 0.25 secs. (ON)
0.25 secs. (OFF)
In the arming condition when either of doors is unlocked and
with not key in the key cylinder, force lock signal is output.