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Lotus Fob won't work, I can lock the car doors, but cannot unlock the security in order to start the car

My car would not start as the engine button will not turn over if you don't have the fob. I had the fob, but the battery was dying, so it unlocks doors, but cant allow the "trip" of the security on the engine switch. Got new batteries, and does the same thing. So?

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Posted on Jan 02, 2017

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SOURCE: lotus elise 2005 fob and key does not work

Re-synchronize the FOB if the problem is with just one key.

1. Hold down both buttons simultaneously until the fob LED goes out. (10 seconds)

2. Release both buttons -- the LED should come on and stay on.

3. Press the larger fob button for a second, and the LED should flash.

IF re-synchronization doesn't work, you may have to replace the fob. Call customer service with your PIN (on the key-card that came with the keys). IF you don't have the PIN, then you need to call customeor service to confirm/register your ownership of the car.

If the keys are re-synchronized and it still doesn't work:

Re-program.

1. Re-synchronize as above, if you have not done so.

2. Turn the ignition on 3 times within 7 seconds. The red light above the odometer should light and stay on for 3 seconds.

3. Enter the PIN. Immediately after the red light goes out as per 2 above, switch on the ignition and count the number of flashes until it equals the number of the first digit on your PIN, then turn the ignition off, then on again. Do this for all four numbers.

4. What a pain, but if you get it wrong on a count, then you can restart by turning the ignition off for 10 seconds.

5. After the fourth digit, if the PIN is correct, the red light will stay on. Then you can re-test the fobs, and it should work.

Otherwise, call customer service.

Hope this helps.

Posted on Jan 12, 2009

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Alarm in my 2002 gmc Sonoma goes off when I open the door with the key. Lost remote. Can I disable the alarm without messing other things up?


Door Key Switch
The BCM monitors the door key switches in order to disarm the CTD system. When the lock cylinder turns in order to unlock the door, the switch grounds the disarm input to the BCM.
The key lock input to the BCM is probably missing , BCM doesn't see it . So it think's your breaking into the vehicle. Did you try the passenger door to see if it will disable the alarm .
The BCM - body control module ! Electronic -computer !
--------------------------------------------------------------------------------
Content Theft Deterrent (CTD) Does Not Disarm with Key Lock

The factory service repair manual has a 23 step diagnostic procedure . An you would need a factory scan tool to find the correct fix.
Turn ON the ignition with the engine OFF.
With a scan tool, observe the door key switch parameter in the Body Control Module (BCM) security data list.
Does the scan tool display INACTIVE?

Locking the Vehicle Without Arming the System
Use one of the following procedures in order to lock the vehicle without arming the system:
• Procedure A -- Lock the vehicle using the manual door lock knobs. Close all the doors.
• Procedure B -- Close all the doors. Use the key or the power door lock switch in order to lock the door. The doors must be closed prior to locking the doors for this procedure.
Disarming the System
In the arm initiated mode, the following conditions are true:
• The security telltale is ON.
• The doors are open.
In order to disarm a system in the arm initiated mode, perform one of the following procedures:
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• Press the door unlock button on the key fob.
In order to disarm a system in the arm delay or the armed mode, perform one of the following procedures:
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In the alarm mode, the following conditions are true:
• The horns sound intermittently.
• The headlights and the park lamps are flashing.
In order to deactivate a system in the alarm mode, perform one of the following procedures:
• Use the key in order to unlock one of the doors.
• Press the door unlock button on the key fob.
• If the vehicle control module (VCM)/powertrain control module (PCM) receives a valid Passlock™ ignition key rotation.

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There are specialized locksmiths for car keys

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1 Check the condition of your battery, if old, it will not give full power required to communicate with the security system.
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The receiver for the fobs is located in the rear hatch, and it needs to be reprogrammed to the fobs. Try the following procedure;

1. Close all the vehicle doors.
2. Insert the ignition key into the ignition lock cylinder.
3. Press and hold the door unlock switch.
4. While holding the door lock switch in the unlock position, cycle
the ignition ON, OFF, ON, OFF.
5. Release the door unlock switch. The doors will lock and unlock to
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6. Press and hold the LOCK button and the UNLOCK button
simultaneously on one transmitter. After a delay of approximately 15
seconds, the doors will lock and unlock to confirm the programming of
that transmitter.
7. Repeat the previous step to program up to four transmitters.
8. Turn the ignition switch to the RUN position in order to exit the
keyless entry transmitter mode.
9. Operate the transmitter functions in order to verify correct
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In order to stop the security system from doing this: Make sure the car is locked with the key fob by hitting the lock button. Then hit the unlock button on the key fob once and then once again (I do it out of habit). Then open the driver side door, put the key in and it should start no problem.

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