Buy Now | Log In | ALLDATA Corporate Site |
Back To Home Page
Log In To Your Subscription
Go To ALLDATA Back Home
Buy A Subscription! Back Home About ALLDATA Information View Sample Vehicles Read Testimonials View Factory Service Bulletins and Recall Titles Contact Us
Dowload Our Navigation Chart
February 2015: New vehicles added including 2014 GM.
• View New Vehicles
October 2014: Release of 2013 along with initial 2014 Vehicles
• View Vehicles
View All News and Updates:
• Go To News
Tech Tips
  Read All Tech Tips

ALLDATA Tech Articles Are Updated Weekly
• View All Tech Articles

  Dodge Durango: Brake Pulsation Problems In Paul's Durango
• Read Dodge Article
Fixing A Smelly Audi Audi Tech Tip: A4 begins to Smell caused by a Faulty Hose Composition
• Read Audi Article
Why Do You Need To Change Your Timing Belt? Why Replace Your Timing Belt
• Read Belt Article
Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
Home >> Featured Tech Articles >> Go Back
  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

'93 Buick LeSabre, Computer Lock-out

Q: I bought my father a ‘93 Buick LeSabre with 97k for $2000 from a co-worker. It worked beautifully until one morning it wouldn't start. Our mechanic can start the car from under the hood so he doesn't think it is the starter. When he turns the key the security light flashes. He thinks the car has locked itself down and will not respond to either of our keys. It has been in the shop for 4 days and we are no closer to getting the problem solved.

A: If you take a look at the ignition key to the vehicle you will see a small black chip with a small piece of metal on each side. This chip has an electrical value that is used by the vehicle’s security system to allow the vehicle to be started. There are 2 common problems with the system used in your father’s vehicle. The chip in the key goes bad so no signal is sent to the security system or the tumbler and housing that the key goes into is worn and will not allow the signal/code from the chip to get sent to the security system. The fix? Replace one or the other or both. But there is a catch. The security system has to receive the right signal/code and not just any signal/code. It has to be the right one for your vehicle or it will never start. How do you prove this is the problem? Take an ohm meter to the metal on each side of the chip on the key and record the readings/values. Then under the dash of the vehicle there will be a small 2 wire connectors that come from the key and tumbler housing. Unplug this connector and check the values and compare it to the reading recorded from the key chip. This has to be performed with the key installed. Then turn the key in the housing and monitor the values. If there is a sudden change just for a moment the key housing/tumbler is bad and has to be replaced. Why? Because the security system thinks someone is messing with the vehicle and will not allow it to start. If the key chip is bad you’ll have to have the vehicle towed to your nearest GM dealer. They have this tool/computer that goes in place of the key and ids the security system code. This will allow them to make up a new key to replace the one with the failed chip. The local hardware store just can’t help with this one.

Have any Questions About Please Email Us
Buy Now | Log In | About | Sample Vehicles | Testimonials | Join Affiliate Program