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1999 Lexus SC 400 Car Alarm

Tiny
STACYARDOIN
  • MEMBER
  • 1999 LEXUS SC 400
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
My cars ignition is connected to the alarm. I locked my door by accident which I never do because one time before just for a few hours it took forever to get in the car. Well this time when I locked it, I kept it locked all night and now when I put my key in the door lock and wait for the security light to go off the lsecurity light goes off but the car still want start. The alarm light is turning off but the car doors are not unlocking and the lock on the ignition is not releasing allowing the car to start. The car will turn on, but it want start up. What do I do
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Thursday, April 8th, 2010 AT 7:25 PM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi stacyardoin,

Thank you for the donation.

The security light turning off means the immobilizer system is working correctly.

As the door locks are not operative, the problem would be with the anti-theft system. Did you try locking and unlocking the doors, either right or left to check if the alarm can be reset?
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Friday, April 9th, 2010 AT 7:44 AM
Tiny
STACYARDOIN
  • MEMBER
  • 2 POSTS
I have tried to lock and relock the car door several times and although the alarm goes off the car still want turn on. All the light and everything works but the ignition is not unlocking what can I do? I have even left it unlocked over night with the alrm off to see if it would reset and it didn't. What else can I do?
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Friday, April 9th, 2010 AT 10:36 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Since the power door locks are not working, I would suggest we start with this by checking the fuses.

Underhood
1. Dome fuse ( 10 A ).

Underdash, behind keft kick panel.

2. ECU-IG fuse ( 15 A)
3. Cigar Fuse ( 15 A)
4. Gauge Fuse ( 10 A )
5. Door fuse ( 30 A)
6. Power circuit breaker ( 30 A )
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Saturday, April 10th, 2010 AT 8:02 AM

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