How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask John Your Own Question

John
John, Buick Master Technician
Category: Buick
Satisfied Customers: 9176
Experience:  ASE A1-A8 w/L1 GM master technician.Factory certified with 40 years experience.
6408229
Type Your Buick Question Here...
John is online now
A new question is answered every 9 seconds

2003 buick century: security light comes on at times

Customer Question

my 2003 buick century 74kmi is not starting. does nothing at all. security light comes on at times. disconnect battery and wait 3 min usually does it. one key starts better than the other. cleaned keys. sprayed two shots of cleaner in ignition. sometimes pulling several pcm fuses does it. today first time will not start at all regardless. what do i need to do to get this trouble corrected? no codes showing. no other trouble. thank you. 3.1eng.
Submitted: 3 years ago.
Category: Buick
Expert:  John replied 3 years ago.

Hello & Welcome to JA,

 

Make sure your battery cables are clean (the mating surface/) & your battery will pass a load test.

Have you done this ?

Customer: replied 3 years ago.
battery connections clean. no load test done. i can change the battery. headlites strong. car is not TRYING to start due to computer killing everything. ignition is not engaging starter solenoid at all. i have 35 yrs locomotive troubleshooting for ns rr. pulling pcm fuses and reinserting usually starts car. rebooting with batt disconnect usually starts car. no indication i can see that battery is problem. starter not dragging ever. start is immediate once computer allows it. i can change battery easily but i dont think i am seeing battery trouble. i think problem is in  the security circuit disallowing the start signal from the computer??   red security light on alot.
Expert:  John replied 3 years ago.
Ok,very good information & needed. Your problem can be a theft deterrent system fault & one will need to view a scan tool for the BCM & PCM data parameters . This will show any faults & will show where command to start is lost or not prompted.
Customer: replied 3 years ago.
scan tool showing no faults. i have alldata access on this car. could not find helpful info on this problem on alldata. where can i get info on bcm, pcm parameters for this theft deterent problem? securtiy section alldata has little info. where in alldata should i look for help troubleshooting this?
Expert:  John replied 3 years ago.
where you looking at PCM or BCM ?
Customer: replied 3 years ago.
i was looking at the security theft deterent section which isnt much.
Expert:  John replied 3 years ago.
Scan Tool Data List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition in ON, Engine OFF

Auto Learn Timer

Security Data

Seconds

0-2550

His. DTC Cyc. Counts

Security Data

Counts

0-255

Lock-out Timer

Security Data

Seconds

0-2550

Passkey Data Voltage

Security Data

Volts

0-5V

Security Lamp State

Security Data

On/Off

Off

Seed and Key Timer

Security Data

Seconds

0-2550

 

Scan Tool Data Definitions Lockout Timer: The duration of time the system remains in tamper mode The VTD system will disable sampling of the key code for 3 minutes when a tamper is detected.

Auto Learn Timer: The duration of time the system remains in the re-learn wait mode.

Seed and Key Timer: The scan tool displays the time in seconds used by the BCM to learn a valid code from the passlock sensor. The learn procedure consists of 3 seperate periods.

Passkey Data Voltage: Displays the voltage data from the Passkey Sensor to the BCM. The BCM determines if the data received is valid or invalid.

Security Lamp State: Indicates the state of the SECURITY indicator either On or Off.

His DTC Cyc. Counts.: Displays the number of key cycles that have occured in order to clear history DTCs.

 

 

 

John, Buick Master Technician
Category: Buick
Satisfied Customers: 9176
Experience: ASE A1-A8 w/L1 GM master technician.Factory certified with 40 years experience.
John and other Buick Specialists are ready to help you
Customer: replied 3 years ago.
do i need more than a simple obd 2 scan tool? mine has alot of features, about 200$ tool. will this enable me to troubleshoot this or will i need to go to someone with tech 2 equipment?
Expert:  John replied 3 years ago.
Yes, you will need a tool that will access BCM data also

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Dave Nova

    Buick Technician

    Satisfied Customers:

    1718
    ASE Master Certification. GM World Class Certification
< Last | Next >
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Buick Technician

    Satisfied Customers:

    1718
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/PE/peterpete190/2012-2-24_1274_20120215135406.64x64.jpg Pete's Avatar

    Pete

    Buick Technician

    Satisfied Customers:

    1257
    15 years Buick Technician experience and training.
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Buick Technician

    Satisfied Customers:

    768
    15 years master GM tech and mater ASE tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Buick Master Technician

    Satisfied Customers:

    731
    ASE A1-A8 w/L1 GM master technician.Factory certified with 40 years experience.
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    411
    ASE Master 15+years
  • http://ww2.justanswer.com/uploads/MO/molurch/2012-6-6_214526_500.64x64.png Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Buick Mechanic

    Satisfied Customers:

    393
    GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
  • http://ww2.justanswer.com/uploads/Rocket2005/2009-09-13_133703_jack.jpg cartech's Avatar

    cartech

    ASE Certified Technician

    Satisfied Customers:

    307
    master tech automotive shop owner and tech 25 years