none of my buttons on my key for my 2000 gs300 seem to work anymore... I changed the battery and still have the same problem but my alarm still works when i put my had through the window and unlock it manually.

Do you guys think i am going to have to replace the whole thing or not... and if i do have to replace it am i better off going to the dealer and buying one... Where else can i buy one

 

dealer has to program it, so dealer is the only option. Are you sure you put the battery in the right way?

 

what the background of that key?
is it a 'lexus genuine master key', or ?

if you have 1 more master key, u can always reprogram your 'broken key'.
the instruction is on CL.

 

Does the LED on the key light up when you push a button?

 

I have a similar problem w/my 98 GS3 where the key "sometimes" unlocks the trunk, never opens the doors remotely, and will only lock via remote if the driver's door is manually locked from the inside first. I've been told it's most likely that the actuator needs to be replaced. I've just dealt with it but will repair it at the dealer at some point I guess...

 

yea... its wierd the way these things work

 

Check your battery first.

 

I am having a similar problem. Sometimes it works right away and sometimes not at all. Sometimes works after a few pushes and patience.

I have noticed that if I do lock the door from the inside, the button does the second lock to turn the headlights off right away.

I' put in a new battery about a year ago in both remotes and it worked fine until recently. I'm going to try another new battery and see if that fixes it. I don't know why the original battery would last 10 years and the new battery only one.

Please keep us posted on what you find out.

 

Can someone who has a working key please tell me what their red LED light does on the key when you press the button?

When you press, and hold the button, does the red LED light stay on while the button is pressed, or does it go off after a second when still pressing the button?

When I press and hold the button, the red light is on for a scond and then goes off. I can't remember if it did this before I started having problems.

 

When you press any button, even if you hold it, it comes on and then goes off in like one second.... Hope that helps
-Joe

 

my trunk button never works

 

Try this to check the key if you have a tester: I don't know if you can understand this without the pictures that can't be copied but let me know and I could try to explain that part.

INSPECTION
1. INSPECT WIRELESS DOOR LOCK TRANSMITTER
OPERATION
(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 battery
receptacle side terminal and battery (-) to the bottom terminal,
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 operator,
the way of holding the transmitter, and location.

As weak wave is used, operation distance might be shortened
when noise is detected in strong wave or used frequency.
(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.

BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM
2002 LEXUS GS300/GS430
2. CHECK BATTERY CAPACITY
HINT:
Make sure to use the electrical tester.
With the battery unloaded, judge can not be made whether
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 kW).
(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
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM
HINT:
When the temperature of the battery is low, the judge can
not be made correctly.
When the outcome of the test is less than 2.1 V, conduct
the test again after leaving the battery in the place at 18
°C for more than 30 minutes.
By auto power off function, the voltage becomes no load
voltage (more than 2.5 V) condition 0.8 seconds after the
switch was pressed.
Make sure to read the voltage before of it.
High voltage might be shown 1 to 2 times after leaving the
battery, judge should be made with the voltage shown at
the 3rd time or later.
(g) Disconnect the lead.
(h) Set the battery (lithium battery) in the transmitter.
(i) Install the cover, so that the O-ring is not distorted or
slipped off.
(j) Using a screwdriver, tighten the screws.
3. INSPECT WIRELESS DOOR LOCK BUZZER OPERATION
Connect the positive (+) lead from the ohmmeter to terminal 1
and the negative (-) lead to terminal 2, and measure resistance
of approx. 1 kW.
If resistance is not as specified, replace the buzzer.
4. INSPECT WIRELESS DOOR LOCK BUZZER CIRCUIT
5. Connector disconnected:
INSPECT WIRELESS DOOR LOCK CONTROL RECEIVER
CIRCUIT
Disconnect the connector from the receiver and inspect the
connector on the wire harness side, as shown.
Tester connection Condition Specified condition
1 - Ground Constant Continuity
7 - Ground Constant Battery positive voltage
If the circuit is not as specified, inspect the circuits connected
to other parts.
From Back Side
BODY ELECTRICAL - WIRELESS DOOR LOCK CONTROL SYSTEM
6. Connector connected:
INSPECT WIRELESS DOOR LOCK CONTROL RECEIVER
CIRCUIT
Connect the wire harness side connector to the receiver and inspect
the wire harness side connector from the back side.
Tester connection Condition Specified condition
3 - Ground Ignition switch position OFF
Key removed 4.5 - 5.5 V " below 1 V
Transmitter OFF- ON

3 - Ground Ignition switch position OFF
Key removed 4.5 - 5.5 V " below 1 V
Transmitter OFF-ON

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.

 

Did it ever work, or never has? While the lock/unlock buttons for the doors work immediately upon pressing them, it is typical for the trunk unlock button to only work after approximately 3-4 secs of continuous pressure. I think this is a safeguard that prevents unintended unlocking of the trunk. If you unlock the door/s but don't enter the car within 30 secs the doors will automatically relock themselves.

 

The battery turned out to be my problem. I guess new batterys only last 6 months compared to the 8 years I got out of the factory one.